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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DERBY-4519) Infinite loop in StreamFileContainer.writeColumn
Date Tue, 09 Feb 2010 10:37:28 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan closed DERBY-4519.

Closing the issue.

> Infinite loop in StreamFileContainer.writeColumn
> ------------------------------------------------
>                 Key: DERBY-4519
>                 URL: https://issues.apache.org/jira/browse/DERBY-4519
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:,,,,,,
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For:,
>         Attachments: derby-4519-1a-argument_swap.diff, derby-4519-2a-infinite_loop_fixes.diff
> The offset and length argument have been swapped in the calls to InputStream.read(byte,offset,
length) and write(byte,offset, length). This code is inside a do-while (true) loop, and the
only normal way out is when InputStream.read returns -1. This will never happen since the
stream is asked to read zero bytes. Derby ends up eating up all available CPU, limited to
a single core / CPU.
> The bug hasn't been observed because Derby is materializing all values when calling this
code. Enabling streaming capabilities in the sorter revealed it.

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