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Posted to issues@drill.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2015/10/26 23:20:27 UTC
[jira] [Commented] (DRILL-3963) Read raw key value bytes from
sequence files
[ https://issues.apache.org/jira/browse/DRILL-3963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975209#comment-14975209 ]
ASF GitHub Bot commented on DRILL-3963:
---------------------------------------
Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/214#discussion_r43061625
--- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/sequencefile/SequenceFileRecordReader.java ---
@@ -0,0 +1,141 @@
+/**
+ * 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.
+ */
+package org.apache.drill.exec.store.easy.sequencefile;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.ArrayList;
+
+import com.google.common.base.Stopwatch;
+import org.apache.drill.common.exceptions.DrillRuntimeException;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.common.types.TypeProtos;
+import org.apache.drill.common.types.Types;
+import org.apache.drill.exec.ops.OperatorContext;
+import org.apache.drill.exec.physical.impl.OutputMutator;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.store.AbstractRecordReader;
+import org.apache.drill.common.types.TypeProtos.MajorType;
+import org.apache.drill.exec.vector.NullableVarBinaryVector;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.BytesWritable;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hadoop.mapred.FileSplit;
+import org.apache.hadoop.mapred.Reporter;
+import org.apache.hadoop.mapred.SequenceFileAsBinaryInputFormat;
+
+
+public class SequenceFileRecordReader extends AbstractRecordReader {
+ private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SequenceFileRecordReader.class);
+
+ private static final int PER_BATCH_RECORD_COUNT = 4096;
+ private static final int PER_BATCH_BYTES = 256*1024;
+
+ private static final MajorType KEY_TYPE = Types.optional(TypeProtos.MinorType.VARBINARY);
+ private static final MajorType VALUE_TYPE = Types.optional(TypeProtos.MinorType.VARBINARY);
+
+ private final SchemaPath keySchema = SchemaPath.getSimplePath("binary_key");
+ private final SchemaPath valueSchema = SchemaPath.getSimplePath("binary_value");
+
+ private NullableVarBinaryVector keyVector;
+ private NullableVarBinaryVector valueVector;
+ private FileSplit split;
+ private org.apache.hadoop.mapred.RecordReader<BytesWritable, BytesWritable> reader;
+ private BytesWritable key = new BytesWritable();
+ private BytesWritable value = new BytesWritable();
+
+ public SequenceFileRecordReader(final FileSplit split,
+ final Configuration fsConf) {
+ final List<SchemaPath> columns = new ArrayList();
+ columns.add(keySchema);
+ columns.add(valueSchema);
+ setColumns(columns);
+ SequenceFileAsBinaryInputFormat inputFormat = new SequenceFileAsBinaryInputFormat();
+ this.split = split;
+ JobConf jobConf = new JobConf(fsConf);
+ jobConf.setInputFormat(inputFormat.getClass());
+ try {
+ this.reader = inputFormat.getRecordReader(split, jobConf, Reporter.NULL);
--- End diff --
Can this be moved to setup?
> Read raw key value bytes from sequence files
> --------------------------------------------
>
> Key: DRILL-3963
> URL: https://issues.apache.org/jira/browse/DRILL-3963
> Project: Apache Drill
> Issue Type: New Feature
> Reporter: amit hadke
> Assignee: amit hadke
>
> Sequence files store list of key-value pairs. Keys/values are of type hadoop writable.
> Provide a format plugin that reads raw bytes out of sequence files which can be further deserialized by a udf(from hadoop writable -> drill type)
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