[MAPREDUCE-6612] Compressing map output error

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: mrv2
• Assignee: Unassigned
• Reporter: wangjiayou
• Due: 21/Jan/16
• Created: 21/Jan/16 06:59
• Updated: 25/Jan/16 04:18

Description

I used gzip compressionor to compress map output,but there is error occurrence.my hadoop version 2.7.1
Configuration conf = getConf();
conf.setBoolean(Job.MAP_OUTPUT_COMPRESS, true);
conf.setClass(Job.MAP_OUTPUT_COMPRESS_CODEC, GzipCodec.class, CompressionCodec.class);

error info:
2016-01-21 15:02:23 [org.apache.hadoop.mapred.LocalJobRunner]-[INFO] reduce > copy
2016-01-21 15:02:23 [org.apache.hadoop.mapred.LocalJobRunner]-[WARN] job_local1329832043_0001
java.lang.Exception: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in localfetcher#1
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
Caused by: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in localfetcher#1
at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: not a gzip file
at org.apache.hadoop.io.compress.zlib.BuiltInGzipDecompressor.processBasicHeader(BuiltInGzipDecompressor.java:496)
at org.apache.hadoop.io.compress.zlib.BuiltInGzipDecompressor.executeHeaderState(BuiltInGzipDecompressor.java:257)
at org.apache.hadoop.io.compress.zlib.BuiltInGzipDecompressor.decompress(BuiltInGzipDecompressor.java:186)
at org.apache.hadoop.io.compress.DecompressorStream.decompress(DecompressorStream.java:91)
at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:85)
at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:199)
at org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput.shuffle(InMemoryMapOutput.java:97)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.copyMapOutput(LocalFetcher.java:157)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.doCopy(LocalFetcher.java:102)
at org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.run(LocalFetcher.java:85)
2016-01-21 15:02:23 [org.apache.hadoop.mapred.LocalJobRunner]-[INFO] reduce > copy
2016-01-21 15:02:23 [org.apache.hadoop.mapred.LocalJobRunner]-[INFO] reduce > copy
2016-01-21 15:02:24 [org.apache.hadoop.mapred.LocalJobRunner]-[INFO] reduce > copy