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)
