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From "james strachan (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (AMQ-678) MessageCleanup fails with mysql 4.1.x
Date Mon, 05 Jun 2006 15:30:51 GMT
     [ https://issues.apache.org/activemq/browse/AMQ-678?page=all ]

james strachan reassigned AMQ-678:
----------------------------------

    Assign To: Hiram Chirino

> MessageCleanup fails with mysql 4.1.x
> -------------------------------------
>
>          Key: AMQ-678
>          URL: https://issues.apache.org/activemq/browse/AMQ-678
>      Project: ActiveMQ
>         Type: Bug

>   Components: Message Store
>     Versions: 4.0 M4
>     Reporter: Paul Focke
>     Assignee: Hiram Chirino
>     Priority: Minor
>  Attachments: deleteOldMessages.patch
>
>
> When ActiveMQ does a message cleanup using mysql-4.1 for jdbc persistence an error occurs.
 ActiveMQ complains that the connection is already closed.  The nested exception however is
an EOFException.  The exception is thrown by DefaultJDBCAdapter.doDeleteOldMessages(DefaultJDBCAdapter.java:544).
 I poked around I found that the sql statement it produces causes mysql to crash.  It even
causes mysqld to crash when entered in the mysql client console, so this is not a Connector/J
issue.  Here is the statement
> DELETE FROM ACTIVEMQ_MSGS WHERE ( EXPIRATION<>0 AND EXPIRATION<1144326387433)
OR ID <= ( SELECT min(ACTIVEMQ_ACKS.LAST_ACKED_ID) FROM ACTIVEMQ_ACKS WHERE ACTIVEMQ_ACKS.CONTAINER=ACTIVEMQ_MSGS.CONTAINER)
> It can be found in Statements.java:220.
> I have tested this under mysql 4.1.12, 4.1.13 & 5.0.18.  The exceptions were only
thrown in mysql 4.1.  5.0 behaved as would be expected.
> Possible solutions would be : 
>  - rewrite the delete statement so that it doesn't kill mysqld : 
>     - I had a quick look into rewriting the statement but I haven't found how
>     - change the current delete into a select id from ... (this works) and delete records
1 by 1 using the resultSet ( which really sucks when there are lots of messages to be deleted
)
>  - not use mysql-4.1

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