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From "Kim van der Riet (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-5603) [Linearstore] Broker recovery fails with JERR_JREC_BADRECTAIL when record tail is partly or fully separated from rest of record by file boundary
Date Wed, 05 Mar 2014 14:09:44 GMT

    [ https://issues.apache.org/jira/browse/QPID-5603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13920874#comment-13920874
] 

Kim van der Riet commented on QPID-5603:
----------------------------------------

Every record that contains either data and/or an xid (ie is transactional) contains a record
tail. ie:
| Header | XID    | Data    | Tail |
Any record may be divided across a file boundary. The Header is currently one sblock, so cannot
by definition be divided (as a file is made up of an integral number of sblocks), but the
remaining sections may be of arbitrary length, and a file boundary may divide them at arbitrary
offsets. This bug occurs when the record tail is divided exactly (ie the last byte of the
data was the last byte of the previous journal file and the tail is the first byte of data
in the next file) or partly by a file boundary.

> [Linearstore] Broker recovery fails with JERR_JREC_BADRECTAIL when record tail is partly
or fully separated from rest of record by file boundary
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: QPID-5603
>                 URL: https://issues.apache.org/jira/browse/QPID-5603
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>            Reporter: Kim van der Riet
>            Assignee: Kim van der Riet
>
> When a record that contains a record tail (enqueue, transactional dequeue or transaction
records) has the tail separated exactly or partly by a file boundary, then the broker fails
recovery with JERR_JREC_BADRECTAIL. In reality, the file handle reaches EOF, but this error
is not detected and the random values of the uninitialized record tail are taken as the read
values.



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