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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3762) Task tracker died due to OOM
Date Wed, 16 Jul 2008 22:07:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated HADOOP-3762:
---------------------------------

    Attachment: HADOOP-3762.patch

Here's a potential patch. (I've not tested it yet.)

The problem is that the FileSystem cache uses two different keys: one created from the URI
the user passes in and one created from the URI that the FileSystem implementation returns
to describe itself.

This patch changes that, so the user-provided URI is always used.  Ideally we could use the
normalized form that the FileSystem provides, but we don't yet have a FileSystem instance
when we're performing cache lookups.

> Task tracker died due to OOM 
> -----------------------------
>
>                 Key: HADOOP-3762
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3762
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Runping Qi
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: 3762_20080715.patch, 3762_20080715b.patch, 3762_20080715c.patch,
HADOOP-3762.patch, TaskTrackerStackTrace.txt
>
>
> When running about 100 moderate jobs on a small cluster (with 19 Task Trackers),
> the task trackers all died due to OOM.
> I got a chance to dump the jstack strace of a task tracker before it died.
> Its image size was close 4GB!
> I saw 1200+ threads of DFSClient.LeaseChecker.
> Clearly we have a severe resource leakage problem!

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