That looks right. Do you consistently get the error below and the total
job fails? Does it go away when you comment out the map compression?
On 07/01/2014 03:23 PM, Mohit Anchlia wrote:
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)
