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Date: Tue, 23 Jun 2009 17:44:07 -0700 (PDT)
From: "Ari Rabkin (JIRA)" <jira@apache.org>
To: chukwa-dev@hadoop.apache.org
Subject: [jira] Commented: (CHUKWA-323) Chukwa agent unable to stream all
 data source on the jobtracker node
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    [ https://issues.apache.org/jira/browse/CHUKWA-323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723385#action_12723385 ] 

Ari Rabkin commented on CHUKWA-323:
-----------------------------------

Tests committed to trunk; underlying issue not yet closed.

> Chukwa agent unable to stream all data source on the jobtracker node
> --------------------------------------------------------------------
>
>                 Key: CHUKWA-323
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-323
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: data collection
>    Affects Versions: 0.2.0
>         Environment: Redhat EL 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: Jerome Boulon
>            Priority: Blocker
>             Fix For: 0.2.0
>
>         Attachments: testForLeaks.patch
>
>
> HDFS namenode and mapreduce related metrics seem to stop sending data since 06/21/2009 00:00:00. 
> Agent log contains exceptions like these:
> 2009-06-21 21:28:01,165 WARN Thread-10 FileTailingAdaptor - failure reading
> /usr/local/hadoop/var/log/history/host.example.com_1245463671645_job_200906200207_0351_user_Chukwa-Demux_20090620_09_56
> java.io.FileNotFoundException:
> /usr/local/hadoop/var/log/history/host.example.com_1245463671645_job_200906200207_0351_user_Chukwa-Demux_20090620_09_56
> (Too many open files)
>         at java.io.RandomAccessFile.open(Native Method)
>         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
>         at
> org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.FileTailingAdaptor.tailFile(FileTailingAdaptor.java:239)
>         at org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.FileTailer.run(FileTailer.java:90)
> 2009-06-21 21:28:01,165 WARN Thread-10 FileTailingAdaptor - Adaptor|58fb855b5c26d36cc1e69e264ce3402c| file:
> /usr/local/hadoop/var/log/history/host.example.com_1245463671645_job_200906200207_0352_user_PigLatin%3AHadoop_jvm_metrics.pig,
> has rotated and no detection - reset counters to 0L
> It looks like the number of file offset tracking pointers exceeded the jvm concurrent number of files open.  Which
> triggers a feedback loop that FileTailingAdaptor assuming log file had rotated, but it wasn't the case. 
> FileTailingAdaptor was simply unable to track the offset that's all.
> [root@gsbl80211 log]# /usr/sbin/lsof -p 29960|wc -l
> 1084
> The concurrent # of open file is 1084 which exceeded the default limit 1024 of concurrent open files.

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