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From Mohit Anchlia <mohitanch...@gmail.com>
Subject Compressing map output
Date Tue, 01 Jul 2014 19:23:32 GMT
I am trying to compress mapoutput but when I add the following code I get
errors. Is there anything wrong that you can point me to?


conf.setBoolean(

"mapreduce.map.output.compress", *true*);

conf.setClass(

"mapreduce.map.output.compress.codec", GzipCodec.*class*,

CompressionCodec.

*class*);

14/07/01 22:21:47 INFO mapreduce.Job: Task Id :
attempt_1404239414989_0008_r_000000_1, Status : FAILED

Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error
in shuffle in fetcher#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.YarnChild$2.run(YarnChild.java:168)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:415)

at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)

at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)

Caused by: java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES;
bailing-out.

at
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.checkReducerHealth(ShuffleSchedulerImpl.java:323)

at
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.copyFailed(ShuffleSchedulerImpl.java:245)

at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:347)

at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:165)

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