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List:       hadoop-dev
Subject:    [jira] [Created] (HADOOP-15073) SequenceFile.Reader will unexpectedly quit next() iterator while the
From:       "Howard Lee (JIRA)" <jira () apache ! org>
Date:       2017-11-29 8:55:00
Message-ID: JIRA.13121586.1511945651000.343678.1511945700410 () Atlassian ! JIRA
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Howard Lee created HADOOP-15073:
-----------------------------------

             Summary: SequenceFile.Reader will unexpectedly quit next() iterator \
while the file ends with sync and appended  Key: HADOOP-15073
                 URL: https://issues.apache.org/jira/browse/HADOOP-15073
             Project: Hadoop Common
          Issue Type: Bug
          Components: common
    Affects Versions: 3.0.0-alpha3, 2.8.2, 2.7.4, 2.6.3
            Reporter: Howard Lee


The SequenceFile.Writer will insert SYNC into file every SYNC_INTERVAL.
In the case that SequenceFile ends with SYNC coincidentally, and another Writer open \
it with mode AppendIfExits, there meets the BUG. For the AppendIfExits set \
_appendMode _ to _true_ , the init method will insert another SYNC. In such case, \
there will be two SYNC MAKR continuously. In SequenceFile.Reader, the method \
readRecordLength will only test SYNC once, when there's two SYNC MARK, the _length_ \
will be -1(The begining of another SYNC), which means the end of file causing the \
next method quit unexpectedly.



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