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[MAPREDUCE-2125] Put map-reduce framework counters to JobTrackerMetricsInst - MapReduce - [issue]
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...We have lots of useful information in the framework counters including #spills, filesystem read and write.It will be nice to put them all in the jobtracker metrics to get a global view of al...
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http://issues.apache.org/jira/browse/MAPREDUCE-2125
Author: Scott Chen,
2011-01-13, 02:29
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[MAPREDUCE-1823] Reduce the number of calls of HarFileSystem.getFileStatus in RaidNode - MapReduce - [issue]
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...RaidNode makes lots of calls of HarFileSystem.getFileStatus. This method fetches information from DataNode so it is slow. It becomes the bottleneck of the RaidNode. It will be nice if we can...
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http://issues.apache.org/jira/browse/MAPREDUCE-1823
Author: Scott Chen,
2011-01-13, 02:29
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[MAPREDUCE-1903] Allow different slowTaskThreshold for mappers and reducers - MapReduce - [issue]
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...We have been running the new speculative logic in HADOOP-2141 done by Andy in our production cluster.One thing that we observed is that there are significantly low number of speculative redu...
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http://issues.apache.org/jira/browse/MAPREDUCE-1903
Author: Scott Chen,
2011-01-13, 02:29
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[MAPREDUCE-1910] Allow raid policy to specify a parent policy - MapReduce - [issue]
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...We encountered the problem that there are lots of redundancy in our raid.xml file. Most of the policy shares the same properties. It will be nice if a policy can inherit from a previously de...
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http://issues.apache.org/jira/browse/MAPREDUCE-1910
Author: Scott Chen,
2011-01-13, 02:28
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[MAPREDUCE-1969] Allow raid to use Reed-Solomon erasure codes - MapReduce - [issue]
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...Currently raid uses one parity block per stripe which corrects one missing block on one stripe.Using Reed-Solomon code, we can add any number of parity blocks to tolerate more missing blocks...
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http://issues.apache.org/jira/browse/MAPREDUCE-1969
Author: Scott Chen,
2011-01-13, 02:28
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[MAPREDUCE-1764] FairScheduler locality delay may put heavy pressure on Jobtracker - MapReduce - [issue]
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...FairScheduler locality delay feature holds the scheduling of jobs until it gets good locality.This greatly improves the locality of the tasks. Reduce the cost of traffic.We have observed the...
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http://issues.apache.org/jira/browse/MAPREDUCE-1764
Author: Scott Chen,
2011-01-13, 02:27
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[MAPREDUCE-1608] Allow users to do speculative execution of a task manually - MapReduce - [issue]
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...Speculative execution improves the latency of the job. Sometimes the job has few very slow reducers. Spending a little more resource on speculative tasks can improve the latency a lot. It wi...
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http://issues.apache.org/jira/browse/MAPREDUCE-1608
Author: Scott Chen,
2010-11-17, 17:39
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[MAPREDUCE-1463] Reducer should start faster for smaller jobs - MapReduce - [issue]
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...Our users often complain about the slowness of smaller ad-hoc jobs.The overhead to wait for the reducers to start in this case is significant.It will be good if we can start the reducer soon...
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http://issues.apache.org/jira/browse/MAPREDUCE-1463
Author: Scott Chen,
2010-10-08, 00:41
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Re: welcome Scott Chen as a Hadoop Map-Reduce committer - MapReduce - [mail # dev]
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...Thank you very much. It’s my honor. Scott On 8/27/10 5:20 PM, "Dhruba Borthakur" wrote: The Hadoop PMC has voted to make Scott Chen a committer for the Apache ...
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Author: Scott Chen,
2010-08-28, 00:30
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[MAPREDUCE-1845] FairScheduler.tasksToPeempt() can return negative number - MapReduce - [issue]
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...This method can return negative number. This will cause the preemption to under-preempt.The bug was discovered by Joydeep....
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http://issues.apache.org/jira/browse/MAPREDUCE-1845
Author: Scott Chen,
2010-08-24, 21:21
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