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[MAPREDUCE-863] Improve/standardize job history file content format and the management of the history files - MapReduce - [issue]
...This jira will track the various improvements that will be done in the JobHistory component of Hadoop. The main goals:1) Make the content format friendly for consumption by other apps2) Impr...
http://issues.apache.org/jira/browse/MAPREDUCE-863    Author: Devaraj Das, 2014-07-23, 22:03
[MAPREDUCE-864] Enhance JobClient API implementations to look at history files to get information about jobs that are not in memory - MapReduce - [issue]
...MAPREDUCE-817 added an API to get the JobHistory URL from the JobTracker. This is useful in two ways:1) Users can use this API to get the URL, copy the history files to their local disk, and...
http://issues.apache.org/jira/browse/MAPREDUCE-864    Author: Devaraj Das, 2014-07-23, 22:02
[MAPREDUCE-192] In TaskTracker, the notification for waking up the completion-events fetcher thread may be lost - MapReduce - [issue]
...In the TaskTracker, there is a completion events fetcher thread that fetches new events from the JobTracker. Normally, the fetcher thread would sleep for heartbeatInterval amount of time per...
http://issues.apache.org/jira/browse/MAPREDUCE-192    Author: Devaraj Das, 2014-07-21, 21:03
[MAPREDUCE-143] OOM in the TaskTracker while serving map outputs - MapReduce - [issue]
...Saw this exception in the TT logs:2009-02-06 06:18:08,553 ERROR org.mortbay.log: EXCEPTIONjava.lang.OutOfMemoryError: GC overhead limit exceeded2009-02-06 06:18:11,247 ERROR org.mortbay.log:...
http://issues.apache.org/jira/browse/MAPREDUCE-143    Author: Devaraj Das, 2014-07-21, 20:44
[MAPREDUCE-261] Blacklisting of TaskTrackers should take into account the user-ID - MapReduce - [issue]
...With HADOOP-4305, it is possible to blacklist TaskTrackers across jobs. It might make sense to also take into account the users whose tasks are being run on the TaskTrackers, and use it in t...
http://issues.apache.org/jira/browse/MAPREDUCE-261    Author: Devaraj Das, 2014-07-21, 18:05
[MAPREDUCE-345] Investigate whether the array in the JobInProgress that holds TIP references can be removed - MapReduce - [issue]
...The array, in JobInProgress, that holds the references to TIPs is required now only to serve the clients (web UI via JSPs and JobClient APIs, that traverse the array and create the output). ...
http://issues.apache.org/jira/browse/MAPREDUCE-345    Author: Devaraj Das, 2014-07-17, 22:49
[MAPREDUCE-286] Optimize the last merge of the map output files - MapReduce - [issue]
...In ReduceTask, today we do merges of io.sort.factor number of files everytime we merge and write the result back to disk. The last merge can probably be better. For example, if there are io....
http://issues.apache.org/jira/browse/MAPREDUCE-286    Author: Devaraj Das, 2014-07-17, 22:22
[MAPREDUCE-390] Corner case exists in detecting Java process deaths that might lead to orphan pipes processes lying around in memory - MapReduce - [issue]
...In HADOOP-2092, the child pipes process periodically pings the parent Java process to find out whether it is alive. The ping cycle is 5 seconds. Consider the following scenario:1) The Java t...
http://issues.apache.org/jira/browse/MAPREDUCE-390    Author: Devaraj Das, 2014-07-17, 21:02
[MAPREDUCE-2353] Make the MR changes to reflect the API changes in SecureIO library - MapReduce - [issue]
...Make the MR changes to reflect the API changes in SecureIO library. Specifically, the 'group' argument is never used in the SecureIO library, and hence the API changes....
http://issues.apache.org/jira/browse/MAPREDUCE-2353    Author: Devaraj Das, 2013-12-13, 17:09
Re: [VOTE] Release Apache Hadoop 2.1.0-beta - MapReduce - [mail # dev]
...I have just raised https://issues.apache.org/jira/browse/HDFS-5016 .. This bug can easily be reproduced by some HBase tests. I'd like this to be considered before we make a beta release. Hav...
   Author: Devaraj Das, 2013-07-21, 07:43
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