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From <barry.barn...@wellsfargo.com>
Subject KahaDB Journal files go missing
Date Thu, 14 Nov 2013 13:19:16 GMT
How would a journal file go 'missing'?

Our AMQ usage uses the file store or KahaDB. A few months ago there was an incident wherein,
for reasons I cannot found the root cause, some KahaDB journal files (*.log) got deleted or
are missing. Due to this consumers cannot get the messages because the broker cannot find
the next message in queue. After that subsequent messages just gets stuck, at first we don't
have any choice but to delete all KahaDB files including indexes just to make it work of course
the downside is we lose all the current messages. Here's the java stack trace we got when
we encountered the issue.

java.io.IOException: Could not locate data file /.../KahaDB/db-4875.log
        at org.apache.kahadb.journal.Journal.getDataFile(Journal.java:345)
        at org.apache.kahadb.journal.Journal.read(Journal.java:592)
        at org.apache.activemq.store.kahadb.MessageDatabase.load(MessageDatabase.java:786)
        at org.apache.activemq.store.kahadb.KahaDBStore.loadMessage(KahaDBStore.java:956)
        at org.apache.activemq.store.kahadb.KahaDBStore$KahaDBMessageStore$5.execute(KahaDBStore.java:494)
        at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)
        at org.apache.activemq.store.kahadb.KahaDBStore$KahaDBMessageStore.recoverNextMessages(KahaDBStore.java:485)
        at org.apache.activemq.store.ProxyMessageStore.recoverNextMessages(ProxyMessageStore.java:88)
        at org.apache.activemq.broker.region.cursors.QueueStorePrefetch.doFillBatch(QueueStorePrefetch.java:97)
        at org.apache.activemq.broker.region.cursors.AbstractStoreCursor.fillBatch(AbstractStoreCursor.java:262)
        at org.apache.activemq.broker.region.cursors.AbstractStoreCursor.reset(AbstractStoreCursor.java:110)
        at org.apache.activemq.broker.region.cursors.StoreQueueCursor.reset(StoreQueueCursor.java:157)
        at org.apache.activemq.broker.region.Queue.doPageIn(Queue.java:1678)
        at org.apache.activemq.broker.region.Queue.pageInMessages(Queue.java:1898)
        at org.apache.activemq.broker.region.Queue.doBrowse(Queue.java:968)
        at org.apache.activemq.broker.region.Queue.expireMessages(Queue.java:772)
        at org.apache.activemq.broker.region.Queue.access$100(Queue.java:83)
        at org.apache.activemq.broker.region.Queue$2.run(Queue.java:123)
        at org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)

This is how we addressed the issue so subsequent messages will not get stuck and we only lose
a few messages that are in the offending journal file(s). This is the Spring bean way, so
something similar in plain AMQ is also available.
<bean ... class="org.apache.activemq.broker.BrokerService">
  ...
  <property name="persistenceAdapter">
    <bean class="org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter">
      <property name="directory" value="${broker.dataDirectory}"/>
      <property name="ignoreMissingJournalfiles" value="true"/>
    </bean>
  </property>
  ...
</bean>


Regards,

Barry




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