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https://issues.apache.org/jira/browse/AMQ-3982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437928#comment-13437928
]
Timothy Bish commented on AMQ-3982:
-----------------------------------
One error that can be seen:
{noformat}
2012-07-24 11:39:05,287 [n.ch] Scheduler] ERROR Queue
- Problem retrieving message for browse
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:348)
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$1.execute(PList.java:228)
at org.apache.kahadb.page.Transaction.execute(Transaction.java:765)
at
org.apache.activemq.store.kahadb.plist.PList$PListIterator.remove(PList.java:225)
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.doBrowse(Queue.java:1061)
at
org.apache.activemq.broker.region.Queue.expireMessages(Queue.java:804)
at org.apache.activemq.broker.region.Queue.access$100(Queue.java:91)
at org.apache.activemq.broker.region.Queue$2.run(Queue.java:131)
at
org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
{noformat}
and another:
{noformat}
2012-08-08 20:49:47,918 [n.ch] Scheduler] ERROR Queue - Problem retrieving
message for browse
java.util.NoSuchElementException: Chunk stream does not exist, page: 75281 is
marked free
at
org.apache.kahadb.index.ListNode$ListIterator.getFromNextNode(ListNode.java:165)
at org.apache.kahadb.index.ListNode$ListIterator.hasNext(ListNode.java:176)
at
org.apache.activemq.store.kahadb.plist.PList$PListIterator.hasNext(PList.java:204)
at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor$DiskIterator.hasNext(FilePendingMessageCursor.java:503)
at
org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.hasNext(FilePendingMessageCursor.java:297)
at org.apache.activemq.broker.region.Queue.doBrowse(Queue.java:1052)
at org.apache.activemq.broker.region.Queue.expireMessages(Queue.java:804)
at org.apache.activemq.broker.region.Queue.access$100(Queue.java:91)
at org.apache.activemq.broker.region.Queue$2.run(Queue.java:131)
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)
Caused by: java.io.EOFException: Chunk stream does not exist, page: 75281 is
marked free
at org.apache.kahadb.page.Transaction$2.readPage(Transaction.java:455)
at org.apache.kahadb.page.Transaction$2.<init>(Transaction.java:432)
at org.apache.kahadb.page.Transaction.openInputStream(Transaction.java:429)
at org.apache.kahadb.page.Transaction.load(Transaction.java:405)
at org.apache.kahadb.page.Transaction.load(Transaction.java:362)
at org.apache.kahadb.index.ListIndex.loadNode(ListIndex.java:306)
{noformat}
> Overlapping PList iterators can read wrong data or throw exceptions about
> chunk streams not existing.
> -----------------------------------------------------------------------------------------------------
>
> Key: AMQ-3982
> URL: https://issues.apache.org/jira/browse/AMQ-3982
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.6.0
> Reporter: Timothy Bish
> Assignee: Timothy Bish
> Priority: Critical
> Fix For: 5.7.0
>
>
> When multiple PList iterators are in use and happen have an overlapping read
> of PageFile data on disk they can reset each others seek offset and cause an
> exception to be thrown about "chunk stream does not exist" or read of a page
> in the Free list. The reason is that the hasNext of PList iterator needs to
> by sync'd on the index lock to prevent two iterators from entering into a
> readPage call concurrently.
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