Howard Lee created HADOOP-15073:
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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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