[CHUKWA-323] Chukwa agent unable to stream all data source on the jobtracker node

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Invalid
• Affects Version/s: 0.2.0
• Fix Version/s: 0.2.0
• Component/s: Data Collection

Environment

Redhat EL 5.1, Java 6

• Assignee: Jerome Boulon
• Reporter: Eric Yang
• Created: 21/Jun/09 21:43
• Updated: 24/Jun/09 17:12
• Resolved: 24/Jun/09 17:12

Description

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.