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From "Dennis Klinkott (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-2721) Broker hangs reading KahaDB data store
Date Fri, 07 May 2010 14:07:47 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59250#action_59250
] 

Dennis Klinkott commented on AMQ-2721:
--------------------------------------

We had to restart one broker and this time the issue did not show up. Here in the log we can
see that it only takes 5 seconds to read the datastore.

2010-05-07 15:43:25,569 | DEBUG | loading | org.apache.kahadb.index.BTreeIndex | main
...
2010-05-07 15:43:25,637 | DEBUG | loading | org.apache.kahadb.index.BTreeIndex | main
2010-05-07 15:43:30,851 | INFO  | Replayed 68230 operations from the journal in 5.213 seconds.
| org.apache.activemq.store.kahadb.MessageDatabase | main



> Broker hangs reading KahaDB data store
> --------------------------------------
>
>                 Key: AMQ-2721
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2721
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.1
>         Environment: Red hat enterprise
>            Reporter: Dennis Klinkott
>         Attachments: brokerjstack.log
>
>
> Broker hangs on loading the data store. Happens after using the broker for 10 hours in
productive environment.
> In broker log the last entries we see is a bunch of loading kahadb debug entries.
> 2010-05-05 16:06:19,462 | DEBUG | loading | org.apache.kahadb.index.BTreeIndex | main
> But the broker doesn't stall completely. It is doing something with high cpu load. But
it doesn't get the data store loaded. Even after a few hours it doesn't get finished (usually
only takes a few seconds).
> I took a few jstack-dumps where we can see the broker being busy putting something into
a hashmap.
> We have 2 brokers connected as network of brokers.

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