[jira] [Updated] (HADOOP-15073) SequenceFile.Reader will unexpectedly quit next() iterator while the file ends with sync and appended

["Howard Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-15073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard Lee updated HADOOP-15073:
--------------------------------
    External issue URL:   (was: https://issues.apache.org/jira/browse/HADOOP-7139)

> 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: 2.6.3, 2.7.4, 2.8.2, 3.0.0-alpha3
>            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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