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Date: Thu, 13 Dec 2012 16:46:13 +0000 (UTC)
From: "Gary Tully (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Message-ID: <JIRA.12623775.1355415304303.1346.1355417173030@arcas>
In-Reply-To: <JIRA.12623775.1355415304303@arcas>
References: <JIRA.12623775.1355415304303@arcas>
Subject: [jira] [Resolved] (AMQ-4221) NPE plist (temp) sparse removal -
 filependingmessagecursor with selector and expiry
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     [ https://issues.apache.org/jira/browse/AMQ-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gary Tully resolved AMQ-4221.
-----------------------------

    Resolution: Fixed

fix in http://svn.apache.org/viewvc?rev=1421373&view=rev

dangling reference to free page in listindex, can lead to npe (best case) or corruption if page is subsequently reused by another listindex or cce in other cases.
Effects the filependingmessage cursor with sparse expiry, one example would be a sparse selector where the remainder (on disk) expire.
                
> NPE plist (temp) sparse removal - filependingmessagecursor with selector and expiry
> -----------------------------------------------------------------------------------
>
>                 Key: AMQ-4221
>                 URL: https://issues.apache.org/jira/browse/AMQ-4221
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.7.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.8.0
>
>
> {code}2012-12-13 11:37:27,027 [calhost] Task-1] - ERROR Queue                          - Failed to page in more queue messages 
> java.lang.NullPointerException
> 	at org.apache.kahadb.index.ListNode.access$200(ListNode.java:37)
> 	at org.apache.kahadb.index.ListNode$NodeMarshaller.writePayload(ListNode.java:265)
> 	at org.apache.kahadb.index.ListNode$NodeMarshaller.writePayload(ListNode.java:255)
> 	at org.apache.kahadb.page.Transaction.store(Transaction.java:248)
> 	at org.apache.kahadb.index.ListIndex.storeNode(ListIndex.java:326)
> 	at org.apache.kahadb.index.ListNode.store(ListNode.java:332)
> 	at org.apache.kahadb.index.ListNode.access$500(ListNode.java:37)
> 	at org.apache.kahadb.index.ListNode$ListIterator.remove(ListNode.java:227)
> 	at org.apache.activemq.store.kahadb.plist.PList$PListIterator$1.execute(PList.java:229)
> 	at org.apache.kahadb.page.Transaction.execute(Transaction.java:771)
> 	at org.apache.activemq.store.kahadb.plist.PList$PListIterator.remove(PList.java:226)
> 	at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor$DiskIterator.remove(FilePendingMessageCursor.java:517)
> 	at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.remove(FilePendingMessageCursor.java:321)
> 	at org.apache.activemq.broker.region.Queue.doPageInForDispatch(Queue.java:1735)
> 	at org.apache.activemq.broker.region.Queue.pageInMessages(Queue.java:1948)
> 	at org.apache.activemq.broker.region.Queue.iterate(Queue.java:1465)
> 	at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
> 	at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:680)
> {code}

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