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From "Boris Shkolnik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4999) IndexOutOfBoundsException in FSEditLog
Date Fri, 23 Jan 2009 23:15:59 GMT

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

Boris Shkolnik updated HADOOP-4999:
-----------------------------------

    Status: Patch Available  (was: Open)

> 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
>         Attachments: 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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