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[MAPREDUCE-1762] Add a setValue() method in Counter - MapReduce - [issue]
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...Counters are very useful because of the logging and transmitting are already there.It is very convenient to transmit and store numbers. But currently Counter only has an increment() method.I...
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http://issues.apache.org/jira/browse/MAPREDUCE-1762
Author: Scott Chen,
2011-12-12, 06:19
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[MAPREDUCE-1382] MRAsyncDiscService should tolerate missing local.dir - MapReduce - [issue]
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...Currently when some of the local.dir do not exist, MRAsyncDiscService will fail. It should only fail when all directories don't work....
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http://issues.apache.org/jira/browse/MAPREDUCE-1382
Author: Scott Chen,
2011-12-12, 06:18
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[MAPREDUCE-1970] Reed-Solomon code implementation to be used in raid - MapReduce - [issue]
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...A Reed-Solomon erasure code implementation....
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http://issues.apache.org/jira/browse/MAPREDUCE-1970
Author: Scott Chen,
2011-12-12, 06:18
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[MAPREDUCE-1831] BlockPlacement policy for RAID - MapReduce - [issue]
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...Raid introduce the new dependency between blocks within a file.The blocks help decode each other. Therefore we should avoid put them on the same machine.The proposed BlockPlacementPolicy doe...
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http://issues.apache.org/jira/browse/MAPREDUCE-1831
Author: Scott Chen,
2011-11-15, 00:50
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[MAPREDUCE-2207] Task-cleanup task should not be scheduled on the node that the task just failed - MapReduce - [issue]
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...Currently the task-cleanup task always go to the same node that the task just failed.There is a higher chance that it hits a bad node. This should be changed....
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http://issues.apache.org/jira/browse/MAPREDUCE-2207
Author: Scott Chen,
2011-11-15, 00:50
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[MAPREDUCE-2198] Allow FairScheduler to control the number of slots on each TaskTracker - MapReduce - [issue]
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...We can set the number of slots on the TaskTracker to be high and let FairScheduler handles the slots.This approach allows us to change the number of slots on each node dynamically.The admini...
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http://issues.apache.org/jira/browse/MAPREDUCE-2198
Author: Scott Chen,
2011-11-15, 00:49
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[MAPREDUCE-2239] BlockPlacementPolicyRaid should call getBlockLocations only when necessary - MapReduce - [issue]
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...Currently BlockPlacementPolicyRaid calls getBlockLocations for every chooseTarget().This puts pressure on NameNode. We should avoid calling if this file is not raided or a parity file....
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http://issues.apache.org/jira/browse/MAPREDUCE-2239
Author: Scott Chen,
2011-11-15, 00:49
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[MAPREDUCE-2302] Add static factory methods in GaloisField - MapReduce - [issue]
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...GaloisField is immutable and should be kept reuse after creation to avoid redundant calculation of the multiplication and division tables....
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http://issues.apache.org/jira/browse/MAPREDUCE-2302
Author: Scott Chen,
2011-11-15, 00:49
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[MAPREDUCE-2206] The task-cleanup tasks should be optional - MapReduce - [issue]
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...For job does not use OutputCommitter.abort(), this should be able to turn off.This improves the latency of the job because failed tasks are often the bottleneck of the jobs....
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http://issues.apache.org/jira/browse/MAPREDUCE-2206
Author: Scott Chen,
2011-11-15, 00:49
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[MAPREDUCE-2108] Allow TaskScheduler manage number slots on TaskTrackers - MapReduce - [issue]
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...Currently the map slots and reduce slots are managed by TaskTracker configuration.To change the task tracker slots, we need to restart the TaskTrackers.Also, for a non-uniform cluster, we ha...
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http://issues.apache.org/jira/browse/MAPREDUCE-2108
Author: Scott Chen,
2011-11-15, 00:49
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