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[MAPREDUCE-3868] Reenable Raid - MapReduce - [issue]
...Currently Raid is outdated and not compiled. Make it compile....
http://issues.apache.org/jira/browse/MAPREDUCE-3868    Author: Scott Chen, 2015-04-26, 02:29
[MAPREDUCE-2217] The expire launching task should cover the UNASSIGNED task - MapReduce - [issue]
...The ExpireLaunchingTask thread kills the task that are scheduled but not responded.Currently if a task is scheduled on tasktracker and for some reason tasktracker cannot put it to RUNNING.Th...
http://issues.apache.org/jira/browse/MAPREDUCE-2217    Author: Scott Chen, 2014-07-28, 15:09
[MAPREDUCE-1837] Raid should store the metadata in HDFS - MapReduce - [issue]
...Currently if you change the stripe length in the raid policy. The existing raided files cannot be recovered.Also in the future if we want to upgrade to a better erasure code such as Reed-Sol...
http://issues.apache.org/jira/browse/MAPREDUCE-1837    Author: Scott Chen, 2013-02-10, 22:35
[MAPREDUCE-1218] Collecting cpu and memory usage for TaskTrackers - MapReduce - [issue]
...The information can be used for resource aware scheduling.Note that this is related to MAPREDUCE-220. There the per task resource information is collected.This one collects the per machine i...
http://issues.apache.org/jira/browse/MAPREDUCE-1218    Author: Scott Chen, 2012-09-20, 15:07
[MAPREDUCE-1201] Make ProcfsBasedProcessTree collect CPU usage information - MapReduce - [issue]
...This information can be reported back to jobtracker to help profiling jobs and scheduling tasks....
http://issues.apache.org/jira/browse/MAPREDUCE-1201    Author: Scott Chen, 2012-02-03, 22:16
[MAPREDUCE-2601] Add a filter text box to FairSchedulerServlet page - MapReduce - [issue]
...It will be useful if we can filter pool in the fairscheduler UI page....
http://issues.apache.org/jira/browse/MAPREDUCE-2601    Author: Scott Chen, 2012-02-01, 03:39
[MAPREDUCE-1761] FairScheduler should allow separate configuration of node and rack locality wait time - MapReduce - [issue]
...It would be nice that we can separately assign rack locality wait time.In our use case, we would set node locality wait to zero and wait only rack locality.I propose that we add two paramete...
http://issues.apache.org/jira/browse/MAPREDUCE-1761    Author: Scott Chen, 2011-12-12, 06:20
[MAPREDUCE-1829] JobInProgress.findSpeculativeTask should use min() to find the candidate instead of sort() - MapReduce - [issue]
...findSpeculativeTask needs only one candidate to speculate so it does not need to sort the whole list. It may looks OK but someone can still submit big jobs with small slow task thresholds. I...
http://issues.apache.org/jira/browse/MAPREDUCE-1829    Author: Scott Chen, 2011-12-12, 06:19
[MAPREDUCE-1848] Put number of speculative, data local, rack local tasks in JobTracker metrics - MapReduce - [issue]
...It will be nice that we can collect these information in JobTracker metrics...
http://issues.apache.org/jira/browse/MAPREDUCE-1848    Author: Scott Chen, 2011-12-12, 06:19
[MAPREDUCE-1974] FairScheduler can preempt the same task many times - MapReduce - [issue]
...In FairScheduler.preemptTasks(), tasks are collected from JobInProgress.runningMapCache.But tasks repeat multiple times in  JobInProgress.runningMapCache (on rack, node and cluster).Thi...
http://issues.apache.org/jira/browse/MAPREDUCE-1974    Author: Scott Chen, 2011-12-12, 06:19
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elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB