Sourygna Luangsay created CHUKWA-668:
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Summary: Infinite loop in FileTailingAdaptor
Key: CHUKWA-668
URL: https://issues.apache.org/jira/browse/CHUKWA-668
Project: Chukwa
Issue Type: Bug
Components: Data Collection
Affects Versions: 0.6.0
Reporter: Sourygna Luangsay
Fix For: 0.6.0
In LWFTAdaptor.java, lastSlurpTime is never updated, triggering an infinite
loop if we use the
adaptor FileTailingAdaptor and subclass adaptors.
Loop occurs like this:
1) lastSlurpTime is never changed and thus always 0.
2) we append some data to the log file and we do a normal slurp
3) after this slurp, we have: len == fileReadOffset && fixedNameLastModified >
lastSlurpTime
thus we think log file has rotated when it hasn't: fileReadOffset is reset
to 0
4) we get: len > fileReadOffset and so we do a slurp of len bytes.
5) we are in the same situation as 3) -> infinite loop: the agent never stops
sending chunks
to the collector although log files does not change.
It seems like this bug comes from CHUKWA-646. The first patch tailfile.patch
seemed to do it
right but in the second patch, the line "lastSlurpTime =
System.currentTimeMillis();" just
disapeared from LWFTAdaptor.java.
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