You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2014/09/12 05:57:34 UTC
[jira] [Commented] (HADOOP-10809) hadoop-azure: page blob support
[ https://issues.apache.org/jira/browse/HADOOP-10809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14131076#comment-14131076 ]
Hadoop QA commented on HADOOP-10809:
------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12668251/HADOOP-10809.02.patch
against trunk revision 6b8b160.
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 17 new or modified test files.
{color:red}-1 javac{color}. The applied patch generated 1266 javac compiler warnings (more than the trunk's current 1263 warnings).
{color:red}-1 javadoc{color}. The javadoc tool appears to have generated 3 warning messages.
See https://builds.apache.org/job/PreCommit-HADOOP-Build/4703//artifact/trunk/patchprocess/diffJavadocWarnings.txt for details.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-tools/hadoop-azure.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/4703//testReport/
Javac warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/4703//artifact/trunk/patchprocess/diffJavacWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/4703//console
This message is automatically generated.
> hadoop-azure: page blob support
> -------------------------------
>
> Key: HADOOP-10809
> URL: https://issues.apache.org/jira/browse/HADOOP-10809
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools
> Reporter: Mike Liddell
> Assignee: Eric Hanson
> Attachments: HADOOP-10809.02.patch, HADOOP-10809.1.patch
>
>
> Azure Blob Storage provides two flavors: block-blobs and page-blobs. Block-blobs are the general purpose kind that support convenient APIs and are the basis for the Azure Filesystem for Hadoop (see HADOOP-9629).
> Page-blobs use the same namespace as block-blobs but provide a different low-level feature set. Most importantly, page-blobs can cope with an effectively infinite number of small accesses whereas block-blobs can only tolerate 50K appends before relatively manual rewriting of the data is necessary. A simple analogy is that page-blobs are like a regular disk and the basic API is like a low-level device driver.
> See http://msdn.microsoft.com/en-us/library/azure/ee691964.aspx for some introductory material.
> The primary driving scenario for page-blob support is for HBase transaction log files which require an access pattern of many small writes. Additional scenarios can also be supported.
> Configuration:
> The Hadoop Filesystem abstraction needs a mechanism so that file-create can determine whether to create a block- or page-blob. To permit scenarios where application code doesn't know about the details of azure storage we would like the configuration to be Aspect-style, ie configured by the Administrator and transparent to the application. The current solution is to use hadoop configuration to declare a list of page-blob folders -- Azure Filesystem for Hadoop will create files in these folders using page-blob flavor. The configuration key is "fs.azure.page.blob.dir", and description can be found in AzureNativeFileSystemStore.java.
> Code changes:
> - refactor of basic Azure Filesystem code to use a general BlobWrapper and specialized BlockBlobWrapper vs PageBlobWrapper
> - introduction of PageBlob support (read, write, etc)
> - miscellaneous changes such as umask handling, implementation of createNonRecursive(), flush/hflush/hsync.
> - new unit tests.
> Credit for the primary patch: Dexter Bradshaw, Mostafa Elhemali, Eric Hanson, Mike Liddell.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)