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https://issues.apache.org/jira/browse/MAPREDUCE-5368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy resolved MAPREDUCE-5368.
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Resolution: Fixed
+1. I just committed this. Thanks [~zhaoyunjiong]!
> Save memory by set capacity, load factor and concurrency level for
> ConcurrentHashMap in TaskInProgress
> -------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5368
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5368
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1
> Affects Versions: 1.2.0
> Reporter: zhaoyunjiong
> Assignee: zhaoyunjiong
> Fix For: 1.2.1
>
> Attachments: MAPREDUCE-5368.patch
>
>
> Below is histo from our JobTracker:
> num #instances #bytes class name
> ----------------------------------------------
> 1: 136048824 11347237456 [C
> 2: 124156992 5959535616
> java.util.concurrent.locks.ReentrantLock$NonfairSync
> 3: 124156973 5959534704
> java.util.concurrent.ConcurrentHashMap$Segment
> 4: 135887753 5435510120 java.lang.String
> 5: 124213692 3975044400
> [Ljava.util.concurrent.ConcurrentHashMap$HashEntry;
> 6: 63777311 3061310928 java.util.HashMap$Entry
> 7: 35038252 2803060160 java.util.TreeMap
> 8: 16921110 2712480072 [Ljava.util.HashMap$Entry;
> 9: 4803617 2420449192 [Ljava.lang.Object;
> 10: 50392816 2015712640 org.apache.hadoop.mapred.Counters$Counter
> 11: 7775438 1181866576
> [Ljava.util.concurrent.ConcurrentHashMap$Segment;
> 12: 3882847 1118259936 org.apache.hadoop.mapred.TaskInProgress
> ConcurrentHashMap takes more than 14G(5959535616 + 5959534704 + 3975044400).
> The trouble maker are below codes in TaskInProgress.java:
> Map<TaskAttemptID, Locality> taskLocality =
> new ConcurrentHashMap<TaskAttemptID, Locality>();
> Map<TaskAttemptID, Avataar> taskAvataar =
> new ConcurrentHashMap<TaskAttemptID, Avataar>();
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