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[MAPREDUCE-348] A proposal to merge common functionality of various Schedulers - MapReduce - [issue]
...There are at least 3 Schedulers in Hadoop today: Default, Capacity, and Fairshare. Over time, we're seeing a lot of functionality common to all three. Many bug fixes, improvements to existin...
http://issues.apache.org/jira/browse/MAPREDUCE-348    Author: Vivek Ratan, 2014-07-21, 20:48
[MAPREDUCE-555] Provide an option to turn off priorities in jobs - MapReduce - [issue]
...The fairshare scheduler can define pools mapping to queues (as defined in the capacity scheduler - HADOOP-3445). When used in this manner, one can imagine queues set up to be used by users w...
http://issues.apache.org/jira/browse/MAPREDUCE-555    Author: Hemanth Yamijala, 2014-07-21, 20:46
[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-354] the map output servlet should only locate the index if it isn't in the cache - MapReduce - [issue]
...Currently, the map output servlet locates the cache file using the local dir allocator, before it determines whether the information is in the cache. It would avoid a lot of filesystem looku...
http://issues.apache.org/jira/browse/MAPREDUCE-354    Author: Owen OMalley, 2014-07-21, 20:41
[MAPREDUCE-190] MultipleOutputs should use newer Hadoop serialization interface since 0.19 - MapReduce - [issue]
...We have a system based on Hadoop 0.18 / Cascading 0.8.1 and now I'm trying to port it to Hadoop 0.19 / Cascading 1.0. The first serious problem I've got into that we're extensively using Mul...
http://issues.apache.org/jira/browse/MAPREDUCE-190    Author: Mikhail Yakshin, 2014-07-21, 20:40
[MAPREDUCE-132] getSetupAndCleanupTasks should return multiple tasks in a heartbeat - MapReduce - [issue]
...getSetupAndCleanupTasks in JobTracker returns one task per heartbeat. With HADOOP-3136, schedulers give multiple tasks  per heartbeat, getSetupAndCleanupTasks should also give multiple ...
http://issues.apache.org/jira/browse/MAPREDUCE-132    Author: Amareshwari Sriramadasu, 2014-07-21, 20:38
[MAPREDUCE-183] The description for some of the configuration entries in the default xml files are outdated and needs to be updated - MapReduce - [issue]
...Description for some configuration entries in mapred-default.xml are outdated. For example, io.sort.mb. This file needs to be revisited and descriptions updated. The same is probably true fo...
http://issues.apache.org/jira/browse/MAPREDUCE-183    Author: Jothi Padmanabhan, 2014-07-21, 20:25
[MAPREDUCE-406] setting fs.default.name to an invalid URI format kills init thread in JobTracker - MapReduce - [issue]
...If you set fs.default.name in a JobConf object to something that causes java.net.URI to throw an IllegalArgumentException, the job not only fails initalization, but kills the JobInitThread...
http://issues.apache.org/jira/browse/MAPREDUCE-406    Author: sam rash, 2014-07-21, 20:22
[MAPREDUCE-5654] blacklist is not propagated from AM to RM - MapReduce - [issue]
...I was trying to blacklist some nodes. I added a set of hosts as strings into blacklistAdditions list and propagated into RMContainerRequestor#makeRemoteRequest to the RM. However the blackli...
http://issues.apache.org/jira/browse/MAPREDUCE-5654    Author: Robert Grandl, 2014-07-21, 20:04
[MAPREDUCE-241] JobQueueTaskScheduler could assign multiple reduces per heartbeat - MapReduce - [issue]
...Currently the JobQueueTaskScheduler assigns only 1 reduce per heartbeat, for applications where latency is important we could assign more reduces (upto available slots)....
http://issues.apache.org/jira/browse/MAPREDUCE-241    Author: Arun C Murthy, 2014-07-21, 19:32
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