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[MAPREDUCE-3992] Reduce fetcher doesn't verify HTTP status code of response - MapReduce - [issue]
...Currently, the reduce fetch code doesn't check the HTTP status code of the response. This can lead to the following situation: the map output servlet gets an IOException after setting the he...
http://issues.apache.org/jira/browse/MAPREDUCE-3992    Author: Todd Lipcon, 2013-08-01, 12:38
Re: Recovering the namenode from failure - MapReduce - [mail # user]
...Hi David,  You shouldn't need to do anything to get your DNs to report in -- as best they can tell, it's the same NN. Do you see any error messages in the DN logs?  -Todd  On ...
   Author: Todd Lipcon, 2013-05-21, 16:23
[MAPREDUCE-2289] Permissions race can make getStagingDir fail on local filesystem - MapReduce - [issue]
...I've observed the following race condition in TestFairSchedulerSystem which uses a MiniMRCluster on top of RawLocalFileSystem: two threads call getStagingDir at the same time Thread A checks...
http://issues.apache.org/jira/browse/MAPREDUCE-2289    Author: Todd Lipcon, 2013-05-06, 05:07
[MAPREDUCE-3946] If a resource requirement is higher than available on any node, job should fail early - MapReduce - [issue]
...If you configure the NMs to have 1GB of RAM each, and then try to submit a job which has an AM resource requirement of 1.5GB, the job will neither run nor fail. Instead, it will slowly sop o...
http://issues.apache.org/jira/browse/MAPREDUCE-3946    Author: Todd Lipcon, 2013-05-04, 20:29
[MAPREDUCE-3950] Configuration templates still MR1-centric - MapReduce - [issue]
...The conf files in the dist tar's share/hadoop/common/templates/conf/ directory are very MR1-centric. For example, they set many JobTracker parameters, and there's no yarn-site included. the ...
http://issues.apache.org/jira/browse/MAPREDUCE-3950    Author: Todd Lipcon, 2013-05-04, 00:25
[MAPREDUCE-3949] If AM fails due to overrunning resource limits, error not visible through UI sometimes - MapReduce - [issue]
...I had a case where an MR AM eclipsed the configured memory limit. This caused the AM's container to get killed, but nowhere accessible through the web UI showed these diagnostics. I had to g...
http://issues.apache.org/jira/browse/MAPREDUCE-3949    Author: Todd Lipcon, 2013-04-09, 21:45
[MAPREDUCE-2389] Spurious EOFExceptions reading SpillRecord index files - MapReduce - [issue]
...In large jobs, I see around 1 shuffle fetch out of every million fetches fail with an EOFException reading the SpillRecord index file. After lots of investigation, including systemtap, it lo...
http://issues.apache.org/jira/browse/MAPREDUCE-2389    Author: Todd Lipcon, 2013-04-04, 20:12
[MAPREDUCE-3951] Tasks are not evenly spread throughout cluster in MR2 - MapReduce - [issue]
...In MR1 (at least with the fair and fifo schedulers), if you submit a job that needs fewer resources than the cluster can provide, the tasks are spread relatively evenly across the node. For ...
http://issues.apache.org/jira/browse/MAPREDUCE-3951    Author: Todd Lipcon, 2013-04-02, 23:10
[MAPREDUCE-2760] mapreduce.jobtracker.split.metainfo.maxsize typoed in mapred-default.xml - MapReduce - [issue]
...The configuration mapreduce.jobtracker.split.metainfo.maxsize is incorrectly included in mapred-default.xml as mapreduce.job.split.metainfo.maxsize. It seems that jobtracker is correct, sinc...
http://issues.apache.org/jira/browse/MAPREDUCE-2760    Author: Todd Lipcon, 2013-03-26, 17:12
[MAPREDUCE-1119] When tasks fail to report status, show tasks's stack dump before killing - MapReduce - [issue]
...When the TT kills tasks that haven't reported status, it should somehow gather a stack dump for the task. This could be done either by sending a SIGQUIT (so the dump ends up in stdout) or pe...
http://issues.apache.org/jira/browse/MAPREDUCE-1119    Author: Todd Lipcon, 2013-03-02, 18:10
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