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[MAPREDUCE-5728] Check NPE for serializer/deserializer in MapTask - MapReduce - [issue]
...Currently we will get NPE if the serializer/deserializer is not configured correctly.14/01/14 11:52:35 INFO mapred.JobClient: Task Id : attempt_201401072154_0027_m_000002_2, Status : FAILEDj...
http://issues.apache.org/jira/browse/MAPREDUCE-5728    Author: Jerry He, 2015-03-10, 04:46
[MAPREDUCE-2042] InputFormat#getSplits() is called twice in local mode - MapReduce - [issue]
...In local mode the InputFormat#getSplits() is called twice in local mode. 1st time: JobClient#writeOld/NewSplits() (then they write the splits to disk ) 2nd time: LocalJobRunner#run() (instea...
http://issues.apache.org/jira/browse/MAPREDUCE-2042    Author: Johannes Zillmann, 2015-03-10, 02:58
[MAPREDUCE-2083] Run partial reduce instead of combiner at reduce node to overlap shuffle delay with reduce - MapReduce - [issue]
...Shuffle delays can be large for mapreductions with lots of intermediate data. Some of this shuffle delay can be overlapped with reduce if some of the reduce computation is started on partial...
http://issues.apache.org/jira/browse/MAPREDUCE-2083    Author: Faraz Ahmad, 2015-03-10, 02:54
[MAPREDUCE-1939] split reduce compute phase into two threads one for reading and another for computing - MapReduce - [issue]
...it is known that  reduce task is made up of three phases: shuffle , sort and reduce. During reduce phase, a reduce function will read a record from disk or memory first and process it t...
http://issues.apache.org/jira/browse/MAPREDUCE-1939    Author: wangxiaowei, 2015-03-10, 02:53
[MAPREDUCE-3475] JT can't renew its own tokens - MapReduce - [issue]
...When external systems submit jobs whose tasks need to submit additional jobs (such as oozie/pig), they include their own MR token used to submit the job.  The token's renewer may not al...
http://issues.apache.org/jira/browse/MAPREDUCE-3475    Author: Daryn Sharp, 2015-03-10, 02:50
[MAPREDUCE-3385] Add warning message for the overflow in reduce() of org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer - MapReduce - [issue]
...When we call the function reduce() of IntSumReducer,the result may overflow.We should send a warning message to users if overflow occurs....
http://issues.apache.org/jira/browse/MAPREDUCE-3385    Author: JiangKai, 2015-03-10, 02:48
[MAPREDUCE-3384] Add warning message for org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer - MapReduce - [issue]
...When we call the function reduce() of LongSumReducer,the result may overflow.We should send a warning message to users if overflow occurs....
http://issues.apache.org/jira/browse/MAPREDUCE-3384    Author: JiangKai, 2015-03-10, 02:48
[MAPREDUCE-3383] Duplicate job.getOutputValueGroupingComparator() in ReduceTask - MapReduce - [issue]
...This is probably just a small error by mistake....
http://issues.apache.org/jira/browse/MAPREDUCE-3383    Author: Binglin Chang, 2015-03-10, 02:27
compiling the source code of hadoop 2.6 - MapReduce - [mail # dev]
...can any1 plz help me..I am trying to compile the source code of hadoop 2.6but finding the error that jdiff package not found. ...
   Author: aashish lh, 2015-03-10, 02:20
[expand - 8 more] - Re: Looking to a Hadoop 3 release - MapReduce - [mail # dev]
...Hi Raymie,Konst proposed just releasing off of trunk rather than cutting a branch-2,and there was general agreement there. So, consider #3 abandoned. 1&2 canbe achieved at the same time, we ...
   Author: Andrew Wang, 2015-03-10, 02:10
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB