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From "Sourygna Luangsay (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CHUKWA-668) Infinite loop in FileTailingAdaptor
Date Thu, 01 Nov 2012 19:27:12 GMT
Sourygna Luangsay created CHUKWA-668:
----------------------------------------

             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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