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From "V.Narayanan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3526) AsynchronousLogShipper#workToDo is blocked while the log shipper sends a log chunk
Date Thu, 27 Mar 2008 10:47:24 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

V.Narayanan updated DERBY-3526:
-------------------------------

    Attachment: Derby3526_1.stat
                Derby3526_1.diff

Thanks for looking at the issue oystein. Fixed issue pointed!

> AsynchronousLogShipper#workToDo is blocked while the log shipper sends a log chunk
> ----------------------------------------------------------------------------------
>
>                 Key: DERBY-3526
>                 URL: https://issues.apache.org/jira/browse/DERBY-3526
>             Project: Derby
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 10.4.0.0, 10.5.0.0
>            Reporter: Jørgen Løland
>            Assignee: V.Narayanan
>         Attachments: Derby3526.diff, Derby3526.stat, Derby3526_1.diff, Derby3526_1.stat
>
>
> The replication log shipper thread synchronizes on 'this' both when shipping log records
(shipALogChunk) and when it waits between log shipments. 
> Transaction threads may try to wake up the log shipper because log has arrived that should
be shipped (i.e., through the method workToDo). These threads should not have to wait for
the monitor if the log shipper is currently busy shipping log. The solution is to have two
monitors - one for log shipment and one for waiting between log shipment.
> This may seem like a minor issue, but if the TCP connection between master and slave
is lost e.g. because a network cable has been unplugged, the log shipper will block for 2
minutes on ObjectOutputStream#writeObject.

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