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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2007/01/04 22:19:27 UTC
[jira] Updated: (HADOOP-815) Investigate and fix the extremely
large memory-footprint of JobTracker
[ https://issues.apache.org/jira/browse/HADOOP-815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Owen O'Malley updated HADOOP-815:
---------------------------------
Status: Open (was: Patch Available)
1. The TaskInProgress.usableTaskIds should be removed and a new task id generated when needed. That list has been bothering me for a while. *smile*
2. You replace a new style for loop with an old style for loop on TaskTracker.java line 597, which should stay a new style loop.
3. The trackerToMarkedTaskMap isn't synchronized by a lock, so has race conditions.
4. There are spacing diffs.
> Investigate and fix the extremely large memory-footprint of JobTracker
> ----------------------------------------------------------------------
>
> Key: HADOOP-815
> URL: https://issues.apache.org/jira/browse/HADOOP-815
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.9.1
> Reporter: Arun C Murthy
> Assigned To: Arun C Murthy
> Fix For: 0.10.0
>
> Attachments: 150k_1199_774.nps, 75k_jobs.nps, HADOOP-815_20061220_1.patch, HADOOP-815_20061221_2.patch, HADOOP-815_20061222_3.patch, HADOOP-815_20061230_4.patch, jt_memory_profiles.tgz
>
>
> The JobTracker's memory footprint seems excessively large, especially when many jobs are submitted.
> Here is the 'top' output of a JobTracker which has scheduled ~1k jobs thus far:
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 31877 arunc 19 0 2362m 261m 13m S 14.0 12.9 24:48.08 java
> Clearly VIRTual memory of 2364Mb v/s 261Mb of RESident memory is symptomatic of this issue...
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