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[MAPREDUCE-1861] Raid should rearrange the replicas while raiding - MapReduce - [issue]
...Raided file introduce extra dependencies on the blocks on the same stripe.Therefore we need a new way to place the blocks.It is desirable that raided file satisfies the following two conditi...
http://issues.apache.org/jira/browse/MAPREDUCE-1861    Author: Scott Chen, 2011-11-15, 00:49
[MAPREDUCE-2212] MapTask and ReduceTask should only compress/decompress the final map output file - MapReduce - [issue]
...Currently if we set mapred.map.output.compression.codec1. MapTask will compress every spill, decompress every spill, merge and compress the final map output file2. ReduceTask will decompress...
http://issues.apache.org/jira/browse/MAPREDUCE-2212    Author: Scott Chen, 2011-11-15, 00:49
[MAPREDUCE-2026] JobTracker.getJobCounters() should not hold JobTracker lock while calling JobInProgress.getCounters() - MapReduce - [issue]
...JobTracker.getJobCounter() will lock JobTracker and call JobInProgress.getCounters().JobInProgress.getCounters() can be very expensive because it aggregates all the task counters.We found th...
http://issues.apache.org/jira/browse/MAPREDUCE-2026    Author: Scott Chen, 2011-11-15, 00:48
[MAPREDUCE-2124] Add job counters for measuring time spent in three different phases in reducers - MapReduce - [issue]
...We currently have SLOTS_MILLIS_REDUCES which measures the total slot time of reducer.It will be useful if we haveSLOTS_MILLIS_REDUCES_COPYSLOTS_MILLIS_REDUCES_SORTSLOTS_MILLIS_REDUCES_REDUCE...
http://issues.apache.org/jira/browse/MAPREDUCE-2124    Author: Scott Chen, 2011-09-15, 05:34
[MAPREDUCE-2131] Aggregate JobCounters and TaskCounters in a background thread - MapReduce - [issue]
...JobTracker.getJobCounters() aggregates the counters when getting requested.It may consume lots of CPU if the request is too often.It may be good if we aggregate them in a background thread.T...
http://issues.apache.org/jira/browse/MAPREDUCE-2131    Author: Scott Chen, 2011-08-19, 11:08
[MAPREDUCE-1950] Jetty Acceptor can stuck TaskTracker forever - MapReduce - [issue]
...We have observed some TaskTrackers keep getting blacklisted because of "Too many fetch-failure" and the logs are full of the following exception.There can be lots of these exceptions in one ...
http://issues.apache.org/jira/browse/MAPREDUCE-1950    Author: Scott Chen, 2011-07-19, 12:25
[MAPREDUCE-2579] The parity path is not initial correctly in BlockPlacementPolicyRaid - MapReduce - [issue]
...BlockPlacementPolicyRaid.initialize() initialize the parity paths.It uses Path.makeQualified() that requires to contact namenode but namenode is not up yet....
http://issues.apache.org/jira/browse/MAPREDUCE-2579    Author: Scott Chen, 2011-06-09, 00:25
[MAPREDUCE-2442] Add a JSP page for RaidNode - MapReduce - [issue]
http://issues.apache.org/jira/browse/MAPREDUCE-2442    Author: Scott Chen, 2011-04-17, 20:01
[MAPREDUCE-2348] TestSimulator* failed on trunk - MapReduce - [issue]
...All Failed Testsorg.apache.hadoop.mapred.TestSimulatorJobTracker.testTrackerInteraction org.apache.hadoop.mapred.TestSimulatorDeterministicReplay.testMain org.apache.hadoop.mapred.TestSimula...
http://issues.apache.org/jira/browse/MAPREDUCE-2348    Author: Scott Chen, 2011-04-07, 15:40
[MAPREDUCE-2292] Provide a shell interface for querying the status of FairScheduler - MapReduce - [issue]
...It will be useful if we have some shell interface to obtain some status in FairScheduler.Just like we can usebin/hadoop job [-list|-list-trackers|-kill-task|...]to obtain JobTracker ...
http://issues.apache.org/jira/browse/MAPREDUCE-2292    Author: Scott Chen, 2011-02-03, 20:04
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