[jira] Updated: (HADOOP-4999) IndexOutOfBoundsException in FSEditLog

["Robert Chansler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-4999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-4999:
------------------------------------

    Release Note:   (was: A failure to write to FsEditsLog results in IndexOutOfBounds exception.)

No release note for "just a bug."

> IndexOutOfBoundsException in FSEditLog
> --------------------------------------
>
>                 Key: HADOOP-4999
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4999
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-4999-1.patch, HADOOP-4999.patch
>
>
> when we go over a collection of editStreams in FSEditLog::logEdit we pre-calculate number of iterations for the "for loop":
> int numEditStreams = editStreams.size();
> for (int idx = 0; idx < numEditStreams(); idx++) {
> ...
> processIOError(idx);
> ...
> }
> but there is a possibility of an IOError that will call processIOError(idx) which will remove an editStream from editStreams inside the loop, and that will cause IndexOutOfBoundsException when end of collection is reached.
> proposed fix: recalculate size of the collection on every iteration (it is very cheap, cause it just returns an integer).

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