Chukwa agent unable to stream all data source on the jobtracker node
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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
Priority: Blocker
Fix For: 0.2.0
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.
[r...@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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