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Posted to commits@nifi.apache.org by al...@apache.org on 2019/02/22 01:03:50 UTC
svn commit: r1854109 [24/50] - in /nifi/site/trunk/docs/nifi-docs: ./
components/org.apache.nifi/nifi-ambari-nar/1.9.0/
components/org.apache.nifi/nifi-ambari-nar/1.9.0/org.apache.nifi.reporting.ambari.AmbariReportingTask/
components/org.apache.nifi/ni...
Added: nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-parquet-nar/1.9.0/org.apache.nifi.processors.parquet.FetchParquet/index.html
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-parquet-nar/1.9.0/org.apache.nifi.processors.parquet.FetchParquet/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>FetchParquet</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">FetchParquet</h1><h2>Description: </h2><p>Reads from a given Parquet file and writes records to the content of the flow file using the selected record writer. The original Parquet file will remain unchanged, and the content of the flow file will be replaced with records of the selected type. This processor can be used with ListHDFS or ListFile to obtain a listing of files to fetch.</p><h3>Tags: </h3><p>parquet, hadoop, HDFS, get, ingest, fetch, source, record</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in
bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name">Hadoop Configuration Resources</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A file or comma separated list of files which contains the Hadoop file system configuration. Without this, Hadoop will search the classpath for a 'core-site.xml' and 'hdfs-site.xml' file or will revert to a default configuration. To use swebhdfs, see 'Additional Details' section of PutHDFS's documentation.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller
Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Kerberos Credentials Controller Service that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Kerberos principal to authenticate as. Requires nifi.kerberos.krb5.file to be set in your nifi.properties<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Kerberos keytab associated with the principal. Requires nifi.kerberos.krb5.file to be set in your nifi.properties<br/><strong>Supports Expression Languag
e: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Relogin Period</td><td id="default-value">4 hours</td><td id="allowable-values"></td><td id="description">Period of time which should pass before attempting a kerberos relogin.
+
+This property has been deprecated, and has no effect on processing. Relogins now occur automatically.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Additional Classpath Resources</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of paths to files and/or directories that will be added to the classpath. When specifying a directory, all files with in the directory will be added to the classpath, but further sub-directories will not be included.</td></tr><tr><td id="name"><strong>Filename</strong></td><td id="default-value">${path}/${filename}</td><td id="allowable-values"></td><td id="description">The name of the file to retrieve<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Record Writer</strong></td><td id="default-value"></td><td
id="allowable-values"><strong>Controller Service API: </strong><br/>RecordSetWriterFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.xml.XMLRecordSetWriter/index.html">XMLRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonRecordSetWriter/index.html">JsonRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVRecordSetWriter/index.html">CSVRecordSetWriter</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedRecordSetWriter/index.html">ScriptedRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroRecordSetWriter/index.html">AvroRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.text.FreeFormTextRecordSetWriter/index.html">FreeFormTextRecordSetWriter</a></
td><td id="description">The service for writing records to the FlowFile content</td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>retry</td><td>FlowFiles will be routed to this relationship if the content of the file cannot be retrieved, but might be able to be in the future if tried again. This generally indicates that the Fetch should be tried again.</td></tr><tr><td>success</td><td>FlowFiles will be routed to this relationship once they have been updated with the content of the file</td></tr><tr><td>failure</td><td>FlowFiles will be routed to this relationship if the content of the file cannot be retrieved and trying again will likely not be helpful. This would occur, for instance, if the file is not found or if there is a permissions issue</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>fetch.fai
lure.reason</td><td>When a FlowFile is routed to 'failure', this attribute is added indicating why the file could not be fetched from the given filesystem.</td></tr><tr><td>record.count</td><td>The number of records in the resulting flow file</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3><table id="restrictions"><tr><th>Required Permission</th><th>Explanation</th></tr><tr><td>read filesystem</td><td>Provides operator the ability to retrieve any file that NiFi has access to in HDFS or the local filesystem.</td></tr></table><h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.parquet.PutParquet/index.html">PutParquet</a></p></body></html>
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-parquet-nar/1.9.0/org.apache.nifi.processors.parquet.PutParquet/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PutParquet</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PutParquet</h1><h2>Description: </h2><p>Reads records from an incoming FlowFile using the provided Record Reader, and writes those records to a Parquet file. The schema for the Parquet file must be provided in the processor properties. This processor will first write a temporary dot file and upon successfully writing every record to the dot file, it will rename the dot file to it's final name. If the dot file cannot be renamed, the rename operation will be attempted up to 10 times, and if still not successful, the dot file will be deleted and the flow file will be routed to failure. If any error occ
urs while reading records from the input, or writing records to the output, the entire dot file will be removed and the flow file will be routed to failure or retry, depending on the error.</p><h3>Tags: </h3><p>put, parquet, hadoop, HDFS, filesystem, record</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name">Hadoop Configuration Resources</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A file or comma separated list of files which contains the Hadoop file system configuration. Without this, Hadoop will search the classpath for a '
core-site.xml' and 'hdfs-site.xml' file or will revert to a default configuration. To use swebhdfs, see 'Additional Details' section of PutHDFS's documentation.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Credentials Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>KerberosCredentialsService<br/><strong>Implementation: </strong><a href="../../../nifi-kerberos-credentials-service-nar/1.9.0/org.apache.nifi.kerberos.KeytabCredentialsService/index.html">KeytabCredentialsService</a></td><td id="description">Specifies the Kerberos Credentials Controller Service that should be used for authenticating with Kerberos</td></tr><tr><td id="name">Kerberos Principal</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Kerberos principal to authenticate as. Requires nifi.kerberos.krb5.file to be set in your ni
fi.properties<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Keytab</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Kerberos keytab associated with the principal. Requires nifi.kerberos.krb5.file to be set in your nifi.properties<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Kerberos Relogin Period</td><td id="default-value">4 hours</td><td id="allowable-values"></td><td id="description">Period of time which should pass before attempting a kerberos relogin.
+
+This property has been deprecated, and has no effect on processing. Relogins now occur automatically.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Additional Classpath Resources</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of paths to files and/or directories that will be added to the classpath. When specifying a directory, all files with in the directory will be added to the classpath, but further sub-directories will not be included.</td></tr><tr><td id="name"><strong>Record Reader</strong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordReaderFactory<br/><strong>Implementations: </strong><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonTreeReader/index.html">JsonTreeReader</a><br/><a href="../../../nifi-record-serialization-services-n
ar/1.9.0/org.apache.nifi.xml.XMLReader/index.html">XMLReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.json.JsonPathReader/index.html">JsonPathReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.Syslog5424Reader/index.html">Syslog5424Reader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.grok.GrokReader/index.html">GrokReader</a><br/><a href="../../../nifi-scripting-nar/1.9.0/org.apache.nifi.record.script.ScriptedReader/index.html">ScriptedReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.avro.AvroReader/index.html">AvroReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.csv.CSVReader/index.html">CSVReader</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.0/org.apache.nifi.syslog.SyslogReader/index.html">SyslogReader</a></td><td id="description">The
service for reading records from incoming flow files.</td></tr><tr><td id="name"><strong>Directory</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The parent directory to which files should be written. Will be created if it doesn't exist.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Compression Type</strong></td><td id="default-value">UNCOMPRESSED</td><td id="allowable-values"><ul><li>UNCOMPRESSED</li><li>SNAPPY</li><li>GZIP</li><li>LZO</li><li>BROTLI</li><li>LZ4</li><li>ZSTD</li></ul></td><td id="description">The type of compression for the file being written.</td></tr><tr><td id="name"><strong>Overwrite Files</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Whether or not to overwrite existing files in the same directory with the same name
. When set to false, flow files will be routed to failure when a file exists in the same directory with the same name.</td></tr><tr><td id="name">Permissions umask</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A umask represented as an octal number which determines the permissions of files written to HDFS. This overrides the Hadoop Configuration dfs.umaskmode</td></tr><tr><td id="name">Remote Group</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Changes the group of the HDFS file to this value after it is written. This only works if NiFi is running as a user that has HDFS super user privilege to change group</td></tr><tr><td id="name">Remote Owner</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Changes the owner of the HDFS file to this value after it is written. This only works if NiFi is running as a user that has HDFS super user privilege to change owner</td></tr><tr><td
id="name">Row Group Size</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The row group size used by the Parquet writer. The value is specified in the format of <Data Size> <Data Unit> where Data Unit is one of B, KB, MB, GB, TB.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Page Size</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The page size used by the Parquet writer. The value is specified in the format of <Data Size> <Data Unit> where Data Unit is one of B, KB, MB, GB, TB.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Dictionary Page Size</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The dictionary page size used by the Parquet writer. T
he value is specified in the format of <Data Size> <Data Unit> where Data Unit is one of B, KB, MB, GB, TB.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Max Padding Size</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The maximum amount of padding that will be used to align row groups with blocks in the underlying filesystem. If the underlying filesystem is not a block filesystem like HDFS, this has no effect. The value is specified in the format of <Data Size> <Data Unit> where Data Unit is one of B, KB, MB, GB, TB.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Enable Dictionary Encoding</td><td id="default-value"></td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifie
s whether dictionary encoding should be enabled for the Parquet writer</td></tr><tr><td id="name">Enable Validation</td><td id="default-value"></td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether validation should be enabled for the Parquet writer</td></tr><tr><td id="name">Writer Version</td><td id="default-value"></td><td id="allowable-values"><ul><li>PARQUET_1_0</li><li>PARQUET_2_0</li></ul></td><td id="description">Specifies the version used by Parquet writer</td></tr><tr><td id="name">Remove CRC Files</td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether the corresponding CRC file should be deleted upon successfully writing a Parquet file</td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>retry</td><td>Flow Files that could not be processed due to issues that can be re
tried are transferred to this relationship</td></tr><tr><td>success</td><td>Flow Files that have been successfully processed are transferred to this relationship</td></tr><tr><td>failure</td><td>Flow Files that could not be processed due to issue that cannot be retried are transferred to this relationship</td></tr></table><h3>Reads Attributes: </h3><table id="reads-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>filename</td><td>The name of the file to write comes from the value of this attribute.</td></tr></table><h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>filename</td><td>The name of the file is stored in this attribute.</td></tr><tr><td>absolute.hdfs.path</td><td>The absolute path to the file is stored in this attribute.</td></tr><tr><td>record.count</td><td>The number of records written to the Parquet file</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: <
/h3><table id="restrictions"><tr><th>Required Permission</th><th>Explanation</th></tr><tr><td>write filesystem</td><td>Provides operator the ability to write any file that NiFi has access to in HDFS or the local filesystem.</td></tr></table><h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.</body></html>
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URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-poi-nar/1.9.0/org.apache.nifi.processors.poi.ConvertExcelToCSVProcessor/additionalDetails.html?rev=1854109&view=auto
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-poi-nar/1.9.0/org.apache.nifi.processors.poi.ConvertExcelToCSVProcessor/additionalDetails.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html>
+<html lang="en">
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<head>
+ <meta charset="utf-8" />
+ <title>ConvertExcelToCSVProcessor</title>
+ <style>
+table {
+ border-collapse: collapse;
+}
+
+table, th, td {
+ border: 1px solid #ccc;
+}
+
+td.r {
+ text-align: right;
+}
+
+td {
+ width: 50px;
+ padding: 5px;
+}
+ </style>
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" />
+</head>
+
+<body>
+<h2>How it extracts CSV data from a sheet</h2>
+<p>
+ ConvertExcelToCSVProcessor extracts CSV data with following rules:
+</p>
+<ul>
+ <li>Find the fist cell which has a value in it (the FirstCell).</li>
+ <li>Scan cells in the first row, starting from the FirstCell,
+ until it reaches to a cell after which no cell with a value can not be found in the row (the FirstRowLastCell).</li>
+ <li>Process the 2nd row and later, from the column of FirstCell to the column of FirstRowLastCell.</li>
+ <li>If a row does not have any cell that has a value, then the row is ignored.</li>
+</ul>
+
+<p>
+ As an example, the sheet shown below will be:
+</p>
+
+<table>
+ <tbody>
+ <tr><th>row </th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th><th>F</th><th>G</th></tr>
+ <tr><td class="r"> 1</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr>
+ <tr><td class="r"> 2</td><td> </td><td> </td><td>x</td><td>y</td><td>z</td><td> </td><td> </td></tr>
+ <tr><td class="r"> 3</td><td> </td><td> </td><td>1</td><td> </td><td> </td><td> </td><td> </td></tr>
+ <tr><td class="r"> 4</td><td>2</td><td> </td><td> </td><td>3</td><td> </td><td> </td><td> </td></tr>
+ <tr><td class="r"> 5</td><td> </td><td> </td><td> </td><td> </td><td>4</td><td> </td><td> </td></tr>
+ <tr><td class="r"> 6</td><td> </td><td> </td><td>5</td><td>6</td><td>7</td><td> </td><td> </td></tr>
+ <tr><td class="r"> 7</td><td> </td><td> </td><td> </td><td> </td><td> </td><td>8</td><td> </td></tr>
+ <tr><td class="r"> 8</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr>
+ <tr><td class="r"> 9</td><td> </td><td> </td><td> </td><td> </td><td>9</td><td> </td><td> </td></tr>
+ <tr><td class="r"> 10</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr>
+ <tr><td class="r"> 11</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr>
+ </tbody>
+</table>
+
+<p>
+ converted to following CSV:
+</p>
+
+<pre>
+x,y,z
+1,,
+,3,
+,,4
+5,6,7
+,,9
+</pre>
+
+<ul>
+ <li>C2(x) is the FirstCell, and E2(z) is the FirstRowLastCell.</li>
+ <li>A4(2) is ignored because it is out of range. So is F7(8).</li>
+ <li>Row 7 and 8 are ignored because those do not have a valid cell.</li>
+ <li>It is important to have a header row as shown in the example to define data area,
+ especially when a sheet includes empty cells.</li>
+</ul>
+
+</body>
+</html>
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-poi-nar/1.9.0/org.apache.nifi.processors.poi.ConvertExcelToCSVProcessor/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>ConvertExcelToCSVProcessor</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">ConvertExcelToCSVProcessor</h1><h2>Description: </h2><p>Consumes a Microsoft Excel document and converts each worksheet to csv. Each sheet from the incoming Excel document will generate a new Flowfile that will be output from this processor. Each output Flowfile's contents will be formatted as a csv file where the each row from the excel sheet is output as a newline in the csv file. This processor is currently only capable of processing .xlsx (XSSF 2007 OOXML file format) Excel documents and not older .xls (HSSF '97(-2007) file format) documents. This processor also expects well forma
tted CSV content and will not escape cell's containing invalid content such as newlines or additional commas.</p><p><a href="additionalDetails.html">Additional Details...</a></p><h3>Tags: </h3><p>excel, csv, poi</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name">Sheets to Extract</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Comma separated list of Excel document sheet names that should be extracted from the excel document. If this property is left blank then all of the sheets will be extracted from the Excel document. The list
of names is case in-sensitive. Any sheets not specified in this value will be ignored.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Number of Rows to Skip</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The row number of the first row to start processing.Use this to skip over rows of data at the top of your worksheet that are not part of the dataset.Empty rows of data anywhere in the spreadsheet will always be skipped, no matter what this value is set to.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Columns To Skip</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Comma delimited list of column numbers to skip. Use the columns number and not the letter designation. Use this to skip ove
r columns anywhere in your worksheet that you don't want extracted as part of the record.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Format Cell Values</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Should the cell values be written to CSV using the formatting applied in Excel, or should they be printed as raw values.</td></tr><tr><td id="name"><strong>CSV Format</strong></td><td id="default-value">custom</td><td id="allowable-values"><ul><li>Custom Format <img src="../../../../../html/images/iconInfo.png" alt="The format of the CSV is configured by using the properties of this Controller Service, such as Value Separator" title="The format of the CSV is configured by using the properties of this Controller Service, such as Value Separator"></img></li><li>RFC 4180 <img src="../../../
../../html/images/iconInfo.png" alt="CSV data follows the RFC 4180 Specification defined at https://tools.ietf.org/html/rfc4180" title="CSV data follows the RFC 4180 Specification defined at https://tools.ietf.org/html/rfc4180"></img></li><li>Microsoft Excel <img src="../../../../../html/images/iconInfo.png" alt="CSV data follows the format used by Microsoft Excel" title="CSV data follows the format used by Microsoft Excel"></img></li><li>Tab-Delimited <img src="../../../../../html/images/iconInfo.png" alt="CSV data is Tab-Delimited instead of Comma Delimited" title="CSV data is Tab-Delimited instead of Comma Delimited"></img></li><li>MySQL Format <img src="../../../../../html/images/iconInfo.png" alt="CSV data follows the format used by MySQL" title="CSV data follows the format used by MySQL"></img></li><li>Informix Unload <img src="../../../../../html/images/iconInfo.png" alt="The format used by Informix when issuing the UNLOAD TO file_name command" title="The format used by Infor
mix when issuing the UNLOAD TO file_name command"></img></li><li>Informix Unload Escape Disabled <img src="../../../../../html/images/iconInfo.png" alt="The format used by Informix when issuing the UNLOAD TO file_name command with escaping disabled" title="The format used by Informix when issuing the UNLOAD TO file_name command with escaping disabled"></img></li></ul></td><td id="description">Specifies which "format" the CSV data is in, or specifies if custom formatting should be used.</td></tr><tr><td id="name"><strong>Value Separator</strong></td><td id="default-value">,</td><td id="allowable-values"></td><td id="description">The character that is used to separate values/fields in a CSV Record</td></tr><tr><td id="name"><strong>Include Header Line</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether or not the CSV column names should be written out as the first line.</td></tr><tr><td
id="name"><strong>Quote Character</strong></td><td id="default-value">"</td><td id="allowable-values"></td><td id="description">The character that is used to quote values so that escape characters do not have to be used</td></tr><tr><td id="name"><strong>Escape Character</strong></td><td id="default-value">\</td><td id="allowable-values"></td><td id="description">The character that is used to escape characters that would otherwise have a specific meaning to the CSV Parser.</td></tr><tr><td id="name">Comment Marker</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The character that is used to denote the start of a comment. Any line that begins with this comment will be ignored.</td></tr><tr><td id="name">Null String</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies a String that, if present as a value in the CSV, should be considered a null field instead of using the literal value.</td></tr><tr><td id="nam
e"><strong>Trim Fields</strong></td><td id="default-value">true</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Whether or not white space should be removed from the beginning and end of fields</td></tr><tr><td id="name"><strong>Quote Mode</strong></td><td id="default-value">NONE</td><td id="allowable-values"><ul><li>Quote All Values <img src="../../../../../html/images/iconInfo.png" alt="All values will be quoted using the configured quote character." title="All values will be quoted using the configured quote character."></img></li><li>Quote Minimal <img src="../../../../../html/images/iconInfo.png" alt="Values will be quoted only if they are contain special characters such as newline characters or field separators." title="Values will be quoted only if they are contain special characters such as newline characters or field separators."></img></li><li>Quote Non-Numeric Values <img src="../../../../../html/images/iconInfo.png" alt="Values
will be quoted unless the value is a number." title="Values will be quoted unless the value is a number."></img></li><li>Do Not Quote Values <img src="../../../../../html/images/iconInfo.png" alt="Values will not be quoted. Instead, all special characters will be escaped using the configured escape character." title="Values will not be quoted. Instead, all special characters will be escaped using the configured escape character."></img></li></ul></td><td id="description">Specifies how fields should be quoted when they are written</td></tr><tr><td id="name"><strong>Record Separator</strong></td><td id="default-value">\n</td><td id="allowable-values"></td><td id="description">Specifies the characters to use in order to separate CSV Records</td></tr><tr><td id="name"><strong>Include Trailing Delimiter</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">If true, a trailing delimiter will be added to each
CSV Record that is written. If false, the trailing delimiter will be omitted.</td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>Excel data converted to csv</td></tr><tr><td>failure</td><td>Failed to parse the Excel document</td></tr><tr><td>original</td><td>Original Excel document received by this processor</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>sheetname</td><td>The name of the Excel sheet that this particular row of data came from in the Excel document</td></tr><tr><td>numrows</td><td>The number of rows in this Excel Sheet</td></tr><tr><td>sourcefilename</td><td>The name of the Excel document file that this data originated from</td></tr><tr><td>convertexceltocsvprocessor.error</td><td>Error message that was encountered on a per Excel sheet basis. This attribute is only popu
lated if an error was occured while processing the particular sheet. Having the error present at the sheet level will allow for the end user to better understand what syntax errors in their excel doc on a larger scale caused the error.</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>System Resource Considerations:</h3>None specified.</body></html>
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-proxy-configuration-nar/1.9.0/org.apache.nifi.proxy.StandardProxyConfigurationService/index.html Fri Feb 22 01:03:44 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>StandardProxyConfigurationService</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">StandardProxyConfigurationService</h1><h2>Description: </h2><p>Provides a set of configurations for different NiFi components to use a proxy server.</p><h3>Tags: </h3><p>Proxy</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>, and whether a property is considered "sensitive", meaning that its v
alue will be encrypted. Before entering a value in a sensitive property, ensure that the <strong>nifi.properties</strong> file has an entry for the property <strong>nifi.sensitive.props.key</strong>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Proxy Type</strong></td><td id="default-value">DIRECT</td><td id="allowable-values"><ul><li>DIRECT</li><li>HTTP</li><li>SOCKS</li></ul></td><td id="description">Proxy type.</td></tr><tr><td id="name">Proxy Server Host</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Proxy server hostname or ip-address.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Proxy Server Port</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Proxy server port number.<br/><strong>Supports Expression Language: true (will be e
valuated using variable registry only)</strong></td></tr><tr><td id="name">Proxy User Name</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the proxy client for user authentication.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Proxy User Password</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The password of the proxy client for user authentication.<br/><strong>Sensitive Property: true</strong><br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>System Resource Considerations:</h3>None specified.</body></html>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>AvroReader</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">AvroReader</h1><h2>Description: </h2><p>Parses Avro data and returns each Avro record as an separate Record object. The Avro data may contain the schema itself, or the schema can be externalized and accessed by one of the methods offered by the 'Schema Access Strategy' property.</p><h3>Tags: </h3><p>avro, parse, record, row, reader, delimited, comma, separated, values</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a prope
rty supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Schema Access Strategy</strong></td><td id="default-value">embedded-avro-schema</td><td id="allowable-values"><ul><li>Use 'Schema Name' Property <img src="../../../../../html/images/iconInfo.png" alt="The name of the Schema to use is specified by the 'Schema Name' Property. The value of this property is used to lookup the Schema in the configured Schema Registry service." title="The name of the Schema to use is specified by the 'Schema Name' Property. The value of this property is used to lookup the Schema in the configured Schema Registry service."></img></li><li>Use 'Schema Text' Property <img src="../../../../../html/images/iconInfo.png" alt="The text of the Schema itself is specified by the 'Schema Text' Property. The value of this pr
operty must be a valid Avro Schema. If Expression Language is used, the value of the 'Schema Text' property must be valid after substituting the expressions." title="The text of the Schema itself is specified by the 'Schema Text' Property. The value of this property must be a valid Avro Schema. If Expression Language is used, the value of the 'Schema Text' property must be valid after substituting the expressions."></img></li><li>HWX Schema Reference Attributes <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile contains 3 Attributes that will be used to lookup a Schema from the configured Schema Registry: 'schema.identifier', 'schema.version', and 'schema.protocol.version'" title="The FlowFile contains 3 Attributes that will be used to lookup a Schema from the configured Schema Registry: 'schema.identifier', 'schema.version', and 'schema.protocol.version'"></img></li><li>HWX Content-Encoded Schema Reference <img src="../../../../../html/images/iconInfo.png" alt="Th
e content of the FlowFile contains a reference to a schema in the Schema Registry service. The reference is encoded as a single byte indicating the 'protocol version', followed by 8 bytes indicating the schema identifier, and finally 4 bytes indicating the schema version, as per the Hortonworks Schema Registry serializers and deserializers, found at https://github.com/hortonworks/registry" title="The content of the FlowFile contains a reference to a schema in the Schema Registry service. The reference is encoded as a single byte indicating the 'protocol version', followed by 8 bytes indicating the schema identifier, and finally 4 bytes indicating the schema version, as per the Hortonworks Schema Registry serializers and deserializers, found at https://github.com/hortonworks/registry"></img></li><li>Confluent Content-Encoded Schema Reference <img src="../../../../../html/images/iconInfo.png" alt="The content of the FlowFile contains a reference to a schema in the Schema Registry serv
ice. The reference is encoded as a single 'Magic Byte' followed by 4 bytes representing the identifier of the schema, as outlined at http://docs.confluent.io/current/schema-registry/docs/serializer-formatter.html. This is based on version 3.2.x of the Confluent Schema Registry." title="The content of the FlowFile contains a reference to a schema in the Schema Registry service. The reference is encoded as a single 'Magic Byte' followed by 4 bytes representing the identifier of the schema, as outlined at http://docs.confluent.io/current/schema-registry/docs/serializer-formatter.html. This is based on version 3.2.x of the Confluent Schema Registry."></img></li><li>Use Embedded Avro Schema <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile has the Avro Schema embedded within the content, and this schema will be used." title="The FlowFile has the Avro Schema embedded within the content, and this schema will be used."></img></li></ul></td><td id="description">Specifies h
ow to obtain the schema that is to be used for interpreting the data.</td></tr><tr><td id="name">Schema Registry</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SchemaRegistry<br/><strong>Implementations: </strong><a href="../../../nifi-hwx-schema-registry-nar/1.9.0/org.apache.nifi.schemaregistry.hortonworks.HortonworksSchemaRegistry/index.html">HortonworksSchemaRegistry</a><br/><a href="../../../nifi-confluent-platform-nar/1.9.0/org.apache.nifi.confluent.schemaregistry.ConfluentSchemaRegistry/index.html">ConfluentSchemaRegistry</a><br/><a href="../../../nifi-registry-nar/1.9.0/org.apache.nifi.schemaregistry.services.AvroSchemaRegistry/index.html">AvroSchemaRegistry</a></td><td id="description">Specifies the Controller Service to use for the Schema Registry</td></tr><tr><td id="name">Schema Name</td><td id="default-value">${schema.name}</td><td id="allowable-values"></td><td id="description">Specifies the name of the schema to
lookup in the Schema Registry property<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Schema Version</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies the version of the schema to lookup in the Schema Registry. If not specified then the latest version of the schema will be retrieved.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Schema Branch</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies the name of the branch to use when looking up the schema in the Schema Registry property. If the chosen Schema Registry does not support branching, this value will be ignored.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></t
d></tr><tr><td id="name">Schema Text</td><td id="default-value">${avro.schema}</td><td id="allowable-values"></td><td id="description">The text of an Avro-formatted Schema<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Cache Size</strong></td><td id="default-value">1000</td><td id="allowable-values"></td><td id="description">Specifies how many Schemas should be cached</td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>System Resource Considerations:</h3>None specified.</body></html>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>AvroRecordSetWriter</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">AvroRecordSetWriter</h1><h2>Description: </h2><p>Writes the contents of a RecordSet in Binary Avro format.</p><h3>Tags: </h3><p>avro, result, set, writer, serializer, record, recordset, row</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th
><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Schema Write Strategy</strong></td><td id="default-value">avro-embedded</td><td id="allowable-values"><ul><li>Embed Avro Schema <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile will have the Avro schema embedded into the content, as is typical with Avro" title="The FlowFile will have the Avro schema embedded into the content, as is typical with Avro"></img></li><li>Set 'schema.name' Attribute <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile will be given an attribute named 'schema.name' and this attribute will indicate the name of the schema in the Schema Registry. Note that ifthe schema for a record is not obtained from a Schema Registry, then no attribute will be added." title="The FlowFile will be given an attribute named 'schema.name' and this attribute will indicate the name of the schema in the Schema Registry. Note that ifthe schema for a record is not obtained
from a Schema Registry, then no attribute will be added."></img></li><li>Set 'avro.schema' Attribute <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile will be given an attribute named 'avro.schema' and this attribute will contain the Avro Schema that describes the records in the FlowFile. The contents of the FlowFile need not be Avro, but the text of the schema will be used." title="The FlowFile will be given an attribute named 'avro.schema' and this attribute will contain the Avro Schema that describes the records in the FlowFile. The contents of the FlowFile need not be Avro, but the text of the schema will be used."></img></li><li>HWX Schema Reference Attributes <img src="../../../../../html/images/iconInfo.png" alt="The FlowFile will be given a set of 3 attributes to describe the schema: 'schema.identifier', 'schema.version', and 'schema.protocol.version'. Note that if the schema for a record does not contain the necessary identifier and version, an Exception
will be thrown when attempting to write the data." title="The FlowFile will be given a set of 3 attributes to describe the schema: 'schema.identifier', 'schema.version', and 'schema.protocol.version'. Note that if the schema for a record does not contain the necessary identifier and version, an Exception will be thrown when attempting to write the data."></img></li><li>HWX Content-Encoded Schema Reference <img src="../../../../../html/images/iconInfo.png" alt="The content of the FlowFile will contain a reference to a schema in the Schema Registry service. The reference is encoded as a single byte indicating the 'protocol version', followed by 8 bytes indicating the schema identifier, and finally 4 bytes indicating the schema version, as per the Hortonworks Schema Registry serializers and deserializers, as found at https://github.com/hortonworks/registry. This will be prepended to each FlowFile. Note that if the schema for a record does not contain the necessary identifier and versi
on, an Exception will be thrown when attempting to write the data." title="The content of the FlowFile will contain a reference to a schema in the Schema Registry service. The reference is encoded as a single byte indicating the 'protocol version', followed by 8 bytes indicating the schema identifier, and finally 4 bytes indicating the schema version, as per the Hortonworks Schema Registry serializers and deserializers, as found at https://github.com/hortonworks/registry. This will be prepended to each FlowFile. Note that if the schema for a record does not contain the necessary identifier and version, an Exception will be thrown when attempting to write the data."></img></li><li>Confluent Schema Registry Reference <img src="../../../../../html/images/iconInfo.png" alt="The content of the FlowFile will contain a reference to a schema in the Schema Registry service. The reference is encoded as a single 'Magic Byte' followed by 4 bytes representing the identifier of the schema, as out
lined at http://docs.confluent.io/current/schema-registry/docs/serializer-formatter.html. This will be prepended to each FlowFile. Note that if the schema for a record does not contain the necessary identifier and version, an Exception will be thrown when attempting to write the data. This is based on the encoding used by version 3.2.x of the Confluent Schema Registry." title="The content of the FlowFile will contain a reference to a schema in the Schema Registry service. The reference is encoded as a single 'Magic Byte' followed by 4 bytes representing the identifier of the schema, as outlined at http://docs.confluent.io/current/schema-registry/docs/serializer-formatter.html. This will be prepended to each FlowFile. Note that if the schema for a record does not contain the necessary identifier and version, an Exception will be thrown when attempting to write the data. This is based on the encoding used by version 3.2.x of the Confluent Schema Registry."></img></li><li>Do Not Write
Schema <img src="../../../../../html/images/iconInfo.png" alt="Do not add any schema-related information to the FlowFile." title="Do not add any schema-related information to the FlowFile."></img></li></ul></td><td id="description">Specifies how the schema for a Record should be added to the data.</td></tr><tr><td id="name">Schema Cache</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordSchemaCacheService<br/><strong>Implementation: </strong><a href="../org.apache.nifi.schema.inference.VolatileSchemaCache/index.html">VolatileSchemaCache</a></td><td id="description">Specifies a Schema Cache to add the Record Schema to so that Record Readers can quickly lookup the schema.</td></tr><tr><td id="name"><strong>Schema Access Strategy</strong></td><td id="default-value">inherit-record-schema</td><td id="allowable-values"><ul><li>Use 'Schema Name' Property <img src="../../../../../html/images/iconInfo.png" alt="The name of the Schema
to use is specified by the 'Schema Name' Property. The value of this property is used to lookup the Schema in the configured Schema Registry service." title="The name of the Schema to use is specified by the 'Schema Name' Property. The value of this property is used to lookup the Schema in the configured Schema Registry service."></img></li><li>Inherit Record Schema <img src="../../../../../html/images/iconInfo.png" alt="The schema used to write records will be the same schema that was given to the Record when the Record was created." title="The schema used to write records will be the same schema that was given to the Record when the Record was created."></img></li><li>Use 'Schema Text' Property <img src="../../../../../html/images/iconInfo.png" alt="The text of the Schema itself is specified by the 'Schema Text' Property. The value of this property must be a valid Avro Schema. If Expression Language is used, the value of the 'Schema Text' property must be valid after substituting
the expressions." title="The text of the Schema itself is specified by the 'Schema Text' Property. The value of this property must be a valid Avro Schema. If Expression Language is used, the value of the 'Schema Text' property must be valid after substituting the expressions."></img></li></ul></td><td id="description">Specifies how to obtain the schema that is to be used for interpreting the data.</td></tr><tr><td id="name">Schema Registry</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SchemaRegistry<br/><strong>Implementations: </strong><a href="../../../nifi-hwx-schema-registry-nar/1.9.0/org.apache.nifi.schemaregistry.hortonworks.HortonworksSchemaRegistry/index.html">HortonworksSchemaRegistry</a><br/><a href="../../../nifi-confluent-platform-nar/1.9.0/org.apache.nifi.confluent.schemaregistry.ConfluentSchemaRegistry/index.html">ConfluentSchemaRegistry</a><br/><a href="../../../nifi-registry-nar/1.9.0/org.apache.nifi.schemare
gistry.services.AvroSchemaRegistry/index.html">AvroSchemaRegistry</a></td><td id="description">Specifies the Controller Service to use for the Schema Registry</td></tr><tr><td id="name">Schema Name</td><td id="default-value">${schema.name}</td><td id="allowable-values"></td><td id="description">Specifies the name of the schema to lookup in the Schema Registry property<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Schema Version</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies the version of the schema to lookup in the Schema Registry. If not specified then the latest version of the schema will be retrieved.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Schema Branch</td><td id="default-value"></td><td id="allowable-values"></td><t
d id="description">Specifies the name of the branch to use when looking up the schema in the Schema Registry property. If the chosen Schema Registry does not support branching, this value will be ignored.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Schema Text</td><td id="default-value">${avro.schema}</td><td id="allowable-values"></td><td id="description">The text of an Avro-formatted Schema<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Compression Format</strong></td><td id="default-value">NONE</td><td id="allowable-values"><ul><li>BZIP2</li><li>DEFLATE</li><li>NONE</li><li>SNAPPY</li><li>LZO</li></ul></td><td id="description">Compression type to use when writing Avro files. Default is None.</td></tr><tr><td id="name"><strong>Cache Size</strong></td><td id="defau
lt-value">1000</td><td id="allowable-values"></td><td id="description">Specifies how many Schemas should be cached</td></tr><tr><td id="name"><strong>Encoder Pool Size</strong></td><td id="default-value">32</td><td id="allowable-values"></td><td id="description">Avro Writers require the use of an Encoder. Creation of Encoders is expensive, but once created, they can be reused. This property controls the maximum number of Encoders that can be pooled and reused. Setting this value too small can result in degraded performance, but setting it higher can result in more heap being used. This property is ignored if the Avro Writer is configured with a Schema Write Strategy of 'Embed Avro Schema'.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table><h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>System Resource Considerations:</h3>None specified.</bo
dy></html>
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@@ -0,0 +1,422 @@
+<!DOCTYPE html>
+<html lang="en">
+ <!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+ <head>
+ <meta charset="utf-8"/>
+ <title>CSVReader</title>
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"/>
+ </head>
+
+ <body>
+ <p>
+ The CSVReader Controller Service, expects input in such a way that the first line of a FlowFile specifies the name of
+ each column in the data. Following the first line, the rest of the FlowFile is expected to be valid CSV data from which
+ to form appropriate Records. The reader allows for customization of the CSV Format, such as which character should be used
+ to separate CSV fields, which character should be used for quoting and when to quote fields, which character should denote
+ a comment, etc.
+ </p>
+
+
+ <h2>Schemas and Type Coercion</h2>
+
+ <p>
+ When a record is parsed from incoming data, it is separated into fields. Each of these fields is then looked up against the
+ configured schema (by field name) in order to determine what the type of the data should be. If the field is not present in
+ the schema, that field is omitted from the Record. If the field is found in the schema, the data type of the received data
+ is compared against the data type specified in the schema. If the types match, the value of that field is used as-is. If the
+ schema indicates that the field should be of a different type, then the Controller Service will attempt to coerce the data
+ into the type specified by the schema. If the field cannot be coerced into the specified type, an Exception will be thrown.
+ </p>
+
+ <p>
+ The following rules apply when attempting to coerce a field value from one data type to another:
+ </p>
+
+ <ul>
+ <li>Any data type can be coerced into a String type.</li>
+ <li>Any numeric data type (Byte, Short, Int, Long, Float, Double) can be coerced into any other numeric data type.</li>
+ <li>Any numeric value can be coerced into a Date, Time, or Timestamp type, by assuming that the Long value is the number of
+ milliseconds since epoch (Midnight GMT, January 1, 1970).</li>
+ <li>A String value can be coerced into a Date, Time, or Timestamp type, if its format matches the configured "Date Format," "Time Format,"
+ or "Timestamp Format."</li>
+ <li>A String value can be coerced into a numeric value if the value is of the appropriate type. For example, the String value
+ <code>8</code> can be coerced into any numeric type. However, the String value <code>8.2</code> can be coerced into a Double or Float
+ type but not an Integer.</li>
+ <li>A String value of "true" or "false" (regardless of case) can be coerced into a Boolean value.</li>
+ <li>A String value that is not empty can be coerced into a Char type. If the String contains more than 1 character, the first character is used
+ and the rest of the characters are ignored.</li>
+ <li>Any "date/time" type (Date, Time, Timestamp) can be coerced into any other "date/time" type.</li>
+ <li>Any "date/time" type can be coerced into a Long type, representing the number of milliseconds since epoch (Midnight GMT, January 1, 1970).</li>
+ <li>Any "date/time" type can be coerced into a String. The format of the String is whatever DateFormat is configured for the corresponding
+ property (Date Format, Time Format, Timestamp Format property).</li>
+ </ul>
+
+ <p>
+ If none of the above rules apply when attempting to coerce a value from one data type to another, the coercion will fail and an Exception
+ will be thrown.
+ </p>
+
+
+ <h2>Schema Inference</h2>
+
+ <p>
+ While NiFi's Record API does require that each Record have a schema, it is often convenient to infer the schema based on the values in the data,
+ rather than having to manually create a schema. This is accomplished by selecting a value of "Infer Schema" for the "Schema Access Strategy" property.
+ When using this strategy, the Reader will determine the schema by first parsing all data in the FlowFile, keeping track of all fields that it has encountered
+ and the type of each field. Once all data has been parsed, a schema is formed that encompasses all fields that have been encountered.
+ </p>
+
+ <p>
+ A common concern when inferring schemas is how to handle the condition of two values that have different types. For example, consider a FlowFile with the following two records:
+ </p>
+<code><pre>
+name, age
+John, 8
+Jane, Ten
+</pre></code>
+
+ <p>
+ It is clear that the "name" field will be inferred as a STRING type. However, how should we handle the "age" field? Should the field be an CHOICE between INT and STRING? Should we
+ prefer LONG over INT? Should we just use a STRING? Should the field be considered nullable?
+ </p>
+
+ <p>
+ To help understand how this Record Reader infers schemas, we have the following list of rules that are followed in the inference logic:
+ </p>
+
+ <ul>
+ <li>All fields are inferred to be nullable.</li>
+ <li>
+ When two values are encountered for the same field in two different records (or two values are encountered for an ARRAY type), the inference engine prefers
+ to use a "wider" data type over using a CHOICE data type. A data type "A" is said to be wider than data type "B" if and only if data type "A" encompasses all
+ values of "B" in addition to other values. For example, the LONG type is wider than the INT type but not wider than the BOOLEAN type (and BOOLEAN is also not wider
+ than LONG). INT is wider than SHORT. The STRING type is considered wider than all other types with the Exception of MAP, RECORD, ARRAY, and CHOICE.
+ </li>
+ <li>
+ Before inferring the type of a value, leading and trailing whitespace are removed. Additionally, if the value is surrounded by double-quotes ("), the double-quotes
+ are removed. Therefore, the value <code>16</code> is interpreted the same as <code> "16"</code>. Both will be interpreted as an INT. However, the value
+ <code>" 16"</code> will be inferred as a STRING type because the white space is enclosed within double-quotes, which means that the white space is considered
+ part of the value.
+ </li>
+ <li>
+ If the "Time Format," "Timestamp Format," or "Date Format" properties are configured, any value that would otherwise be considered a STRING type is first checked against
+ the configured formats to see if it matches any of them. If the value matches the Timestamp Format, the value is considered a Timestamp field. If it matches the Date Format,
+ it is considered a Date field. If it matches the Time Format, it is considered a Time field. In the unlikely event that the value matches more than one of the configured
+ formats, they will be matched in the order: Timestamp, Date, Time. I.e., if a value matched both the Timestamp Format and the Date Format, the type that is inferred will be
+ Timestamp. Because parsing dates and times can be expensive, it is advisable not to configure these formats if dates, times, and timestamps are not expected, or if processing
+ the data as a STRING is acceptable. For use cases when this is important, though, the inference engine is intelligent enough to optimize the parsing by first checking several
+ very cheap conditions. For example, the string's length is examined to see if it is too long or too short to match the pattern. This results in far more efficient processing
+ than would result if attempting to parse each string value as a timestamp.
+ </li>
+ <li>The MAP type is never inferred.</li>
+ <li>The ARRAY type is never inferred.</li>
+ <li>The RECORD type is never inferred.</li>
+ <li>If a field exists but all values are null, then the field is inferred to be of type STRING.</li>
+ </ul>
+
+
+
+ <h2>Caching of Inferred Schemas</h2>
+
+ <p>
+ This Record Reader requires that if a schema is to be inferred, that all records be read in order to ensure that the schema that gets inferred is applicable for all
+ records in the FlowFile. However, this can become expensive, especially if the data undergoes many different transformations. To alleviate the cost of inferring schemas,
+ the Record Reader can be configured with a "Schema Inference Cache" by populating the property with that name. This is a Controller Service that can be shared by Record
+ Readers and Record Writers.
+ </p>
+
+ <p>
+ Whenever a Record Writer is used to write data, if it is configured with a "Schema Cache," it will also add the schema to the Schema Cache. This will result in an
+ identifier for that schema being added as an attribute to the FlowFile.
+ </p>
+
+ <p>
+ Whenever a Record Reader is used to read data, if it is configured with a "Schema Inference Cache", it will first look for a "schema.cache.identifier" attribute on the FlowFile.
+ If the attribute exists, it will use the value of that attribute to lookup the schema in the schema cache. If it is able to find a schema in the cache with that identifier,
+ then it will use that schema instead of reading, parsing, and analyzing the data to infer the schema. If the attribute is not available on the FlowFile, or if the attribute is
+ available but the cache does not have a schema with that identifier, then the Record Reader will proceed to infer the schema as described above.
+ </p>
+
+ <p>
+ The end result is that users are able to chain together many different Processors to operate on Record-oriented data. Typically, only the first such Processor in the chain will
+ incur the "penalty" of inferring the schema. For all other Processors in the chain, the Record Reader is able to simply lookup the schema in the Schema Cache by identifier.
+ This allows the Record Reader to infer a schema accurately, since it is inferred based on all data in the FlowFile, and still allows this to happen efficiently since the schema
+ will typically only be inferred once, regardless of how many Processors handle the data.
+ </p>
+
+
+
+ <h2>Examples</h2>
+
+ <h3>Example 1</h3>
+
+ <p>
+ As an example, consider a FlowFile whose contents consists of the following:
+ </p>
+
+<code>
+id, name, balance, join_date, notes<br />
+1, John, 48.23, 04/03/2007 "Our very<br />
+first customer!"<br />
+2, Jane, 1245.89, 08/22/2009,<br />
+3, Frank Franklin, "48481.29", 04/04/2016,<br />
+</code>
+
+ <p>
+ Additionally, let's consider that this Controller Service is configured with the Schema Registry pointing to an AvroSchemaRegistry and the schema is
+ configured as the following:
+ </p>
+
+<code>
+<pre>
+{
+ "namespace": "nifi",
+ "name": "balances",
+ "type": "record",
+ "fields": [
+ { "name": "id", "type": "int" },
+ { "name": "name": "type": "string" },
+ { "name": "balance": "type": "double" },
+ { "name": "join_date", "type": {
+ "type": "int",
+ "logicalType": "date"
+ }},
+ { "name": "notes": "type": "string" }
+ ]
+}
+</pre>
+</code>
+
+ <p>
+ In the example above, we see that the 'join_date' column is a Date type. In order for the CSV Reader to be able to properly parse a value as a date,
+ we need to provide the reader with the date format to use. In this example, we would configure the Date Format property to be <code>MM/dd/yyyy</code>
+ to indicate that it is a two-digit month, followed by a two-digit day, followed by a four-digit year - each separated by a slash.
+ In this case, the result will be that this FlowFile consists of 3 different records. The first record will contain the following values:
+ </p>
+
+ <table>
+ <head>
+ <th>Field Name</th>
+ <th>Field Value</th>
+ </head>
+ <body>
+ <tr>
+ <td>id</td>
+ <td>1</td>
+ </tr>
+ <tr>
+ <td>name</td>
+ <td>John</td>
+ </tr>
+ <tr>
+ <td>balance</td>
+ <td>48.23</td>
+ </tr>
+ <tr>
+ <td>join_date</td>
+ <td>04/03/2007</td>
+ </tr>
+ <tr>
+ <td>notes</td>
+ <td>Our very<br />first customer!</td>
+ </tr>
+ </body>
+ </table>
+
+ <p>
+ The second record will contain the following values:
+ </p>
+
+ <table>
+ <head>
+ <th>Field Name</th>
+ <th>Field Value</th>
+ </head>
+ <body>
+ <tr>
+ <td>id</td>
+ <td>2</td>
+ </tr>
+ <tr>
+ <td>name</td>
+ <td>Jane</td>
+ </tr>
+ <tr>
+ <td>balance</td>
+ <td>1245.89</td>
+ </tr>
+ <tr>
+ <td>join_date</td>
+ <td>08/22/2009</td>
+ </tr>
+ <tr>
+ <td>notes</td>
+ <td></td>
+ </tr>
+ </body>
+ </table>
+
+ <p>
+ The third record will contain the following values:
+ </p>
+
+ <table>
+ <head>
+ <th>Field Name</th>
+ <th>Field Value</th>
+ </head>
+ <body>
+ <tr>
+ <td>id</td>
+ <td>3</td>
+ </tr>
+ <tr>
+ <td>name</td>
+ <td>Frank Franklin</td>
+ </tr>
+ <tr>
+ <td>balance</td>
+ <td>48481.29</td>
+ </tr>
+ <tr>
+ <td>join_date</td>
+ <td>04/04/2016</td>
+ </tr>
+ <tr>
+ <td>notes</td>
+ <td></td>
+ </tr>
+ </body>
+ </table>
+
+
+
+ <h3>Example 2 - Schema with CSV Header Line</h3>
+
+ <p>
+ When CSV data consists of a header line that outlines the column names, the reader provides
+ a couple of different properties for configuring how to handle these column names. The
+ "Schema Access Strategy" property as well as the associated properties ("Schema Registry," "Schema Text," and
+ "Schema Name" properties) can be used to specify how to obtain the schema. If the "Schema Access Strategy" is set
+ to "Use String Fields From Header" then the header line of the CSV will be used to determine the schema. Otherwise,
+ a schema will be referenced elsewhere. But what happens if a schema is obtained from a Schema Registry, for instance,
+ and the CSV Header indicates a different set of column names?
+ </p>
+
+ <p>
+ For example, let's say that the following schema is obtained from the Schema Registry:
+ </p>
+
+<code>
+<pre>
+{
+ "namespace": "nifi",
+ "name": "balances",
+ "type": "record",
+ "fields": [
+ { "name": "id", "type": "int" },
+ { "name": "name": "type": "string" },
+ { "name": "balance": "type": "double" },
+ { "name": "memo": "type": "string" }
+ ]
+}
+</pre>
+</code>
+
+ <p>
+ And the CSV contains the following data:
+ </p>
+
+<code>
+<pre>
+id, name, balance, notes
+1, John Doe, 123.45, First Customer
+</pre>
+</code>
+
+ <p>
+ Note here that our schema indicates that the final column is named "memo" whereas the CSV Header indicates that it is named "notes."
+ </p>
+
+ <p>
+ In this case, the reader will look at the "Ignore CSV Header Column Names" property. If this property is set to "true" then the column names
+ provided in the CSV will simply be ignored and the last column will be called "memo." However, if the "Ignore CSV Header Column Names" property
+ is set to "false" then the result will be that the last column will be named "notes" and each record will have a null value for the "memo" column.
+ </p>
+
+ <p>
+ With "Ignore CSV Header Column Names" property set to "false":<br />
+ <table>
+ <head>
+ <th>Field Name</th>
+ <th>Field Value</th>
+ </head>
+ <body>
+ <tr>
+ <td>id</td>
+ <td>1</td>
+ </tr>
+ <tr>
+ <td>name</td>
+ <td>John Doe</td>
+ </tr>
+ <tr>
+ <td>balance</td>
+ <td>123.45</td>
+ </tr>
+ <tr>
+ <td>memo</td>
+ <td>First Customer</td>
+ </tr>
+ </body>
+ </table>
+ </p>
+
+
+ <p>
+ With "Ignore CSV Header Column Names" property set to "true":<br />
+ <table>
+ <head>
+ <th>Field Name</th>
+ <th>Field Value</th>
+ </head>
+ <body>
+ <tr>
+ <td>id</td>
+ <td>1</td>
+ </tr>
+ <tr>
+ <td>name</td>
+ <td>John Doe</td>
+ </tr>
+ <tr>
+ <td>balance</td>
+ <td>123.45</td>
+ </tr>
+ <tr>
+ <td>notes</td>
+ <td>First Customer</td>
+ </tr>
+ <tr>
+ <td>memo</td>
+ <td><code>null</code></td>
+ </tr>
+ </body>
+ </table>
+ </p>
+
+ </body>
+</html>