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[MAPREDUCE-7015] Possible race condition in JHS if the job is not loaded - MapReduce - [issue]
...There could be a race condition inside JHS. In our build environment, TestMRJobClient.testJobClient() failed with this File does not exist: hdfs://loc...    Author: Peter Bacsko , 2018-08-28, 17:44
[MAPREDUCE-7020] Task timeout in uber mode can crash AM - MapReduce - [issue]
...TestUberAM is failingjava.lang.AssertionError: No AppMaster log found! expected:<1> but was:<2> at at org.junit.Assert.failNotEquals(Assert....    Author: Akira Ajisaka , 2018-08-27, 22:02
[MAPREDUCE-6861] Add metrics tags for ShuffleClientMetrics - MapReduce - [issue]
...Metrics tags were unintentionally removed by MAPREDUCE-6526. Let's add them back....    Author: Akira Ajisaka , 2018-08-27, 15:18
[MAPREDUCE-7130] Rumen crashes trying to handle MRAppMaster recovery events - MapReduce - [issue]
...In the event of an MRAppMaster recovery, the Job History file gets an event of the following form:{"type":"JOB_KILLED","event":\{"org.apache.hadoop.mapreduce.jobhistory.JobUnsuccessfulComple...    Author: Jonathan Bender , 2018-08-24, 23:02
[MAPREDUCE-7126] Error communicating with RM: Resource Manager doesn't recognize AttemptId: appattempt_idxx - MapReduce - [issue]    Author: Avdhesh kumar , 2018-08-17, 15:54
[MAPREDUCE-7123] AM Failed with Communication error to RM - MapReduce - [issue]
...During the restart of nodemanagers in 300 node cluster some jobs failed with the following exceptions.But the nodes where the AM launched is not the part of cluster.FATAL [AsyncDispatche...    Author: Amithsha , 2018-08-15, 15:06
[MAPREDUCE-7129] Cannot assign container Container: maps.isEmpty=true - MapReduce - [issue]
...we have many mapreduce applications without reduce task, and we found a lot of  Cannot assign container Container: maps.isEmpty=true information in MRAppMaster log, they are unused container...    Author: stefanlee , 2018-08-14, 14:45
[MAPREDUCE-7112] When load job history webpage we do not need make cache firstly - MapReduce - [issue]
...It's very slow to load job history page because of making cache firstly. Obviously, we should skip this....    Author: Zhaohui Xin , 2018-08-14, 12:59
[MAPREDUCE-7128] LocalJobRunner may fail due to metrics name collision - MapReduce - [issue]
...Running Hive in local mode, I got the following failure: Caused by: org.apache.hadoop.metrics2.MetricsException: Metrics source LocalJobRunnerMetrics-1090927800 already exists! at org.apach...    Author: Todd Lipcon , 2018-08-11, 00:37
[ANNOUNCE] Apache Hadoop 3.1.1 release - MapReduce - [mail # dev]
...It gives me great pleasure to announce that the Apache Hadoop community hasvoted to release Apache Hadoop 3.1.1.Hadoop 3.1.1 is the first stable maintenance release for the year 2018 inthe H...
   Author: Wangda Tan , 2018-08-09, 17:27