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Posted to dev@bookkeeper.apache.org by "Flavio Junqueira (Commented) (JIRA)" <ji...@apache.org> on 2012/03/28 23:29:27 UTC
[jira] [Commented] (BOOKKEEPER-195) HierarchicalLedgerManager
doesn't consider idgen as a "specialNode"
[ https://issues.apache.org/jira/browse/BOOKKEEPER-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240750#comment-13240750 ]
Flavio Junqueira commented on BOOKKEEPER-195:
---------------------------------------------
+1, looks good to me.
> HierarchicalLedgerManager doesn't consider idgen as a "specialNode"
> -------------------------------------------------------------------
>
> Key: BOOKKEEPER-195
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-195
> Project: Bookkeeper
> Issue Type: Bug
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: 4.1.0
>
> Attachments: BOOKKEEPER-195.diff, BOOKKEEPER-195.diff
>
>
> From IRC:
> 21:58 <johnnagro> 2012-03-28 05:15:19,669 - ERROR [main-EventThread:AbstractZkLedgerManager$2@105] - Error polling ZK for the available ledger nodes:
> 21:58 <johnnagro> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /ledgers/idgen/ID-0000106522
> 21:58 <johnnagro> at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> 21:58 <johnnagro> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 21:58 <johnnagro> at org.apache.bookkeeper.meta.AbstractZkLedgerManager$2.processResult(AbstractZkLedgerManager.java:105)
> 21:58 <johnnagro> at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:594)
> 21:58 <johnnagro> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497)
> 21:58 <johnnagro> i will look for the gc one
> 21:59 <ivank> thats quite strange
> 22:00 <ivank> this occurred in the server?
> 22:02 <johnnagro> ah they may be related, this one has some GC stuff
> 22:02 <johnnagro> 012-03-24 09:17:34,419 - WARN [GarbageCollectorThread:HierarchicalLedgerManager@376] - Exception during garbage collecting ledgers for idgen of /ledgers
> 22:02 <johnnagro> 2012-03-24 09:56:31,080 - ERROR [main-EventThread:AbstractZkLedgerManager$2@105] - Error polling ZK for the available ledger nodes:
> 22:02 <johnnagro> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /ledgers/idgen/ID-0000037474
> 22:02 <johnnagro> at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> 22:02 <johnnagro> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 22:02 <johnnagro> at org.apache.bookkeeper.meta.AbstractZkLedgerManager$2.processResult(AbstractZkLedgerManager.java:105)
> 22:02 <johnnagro> at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:594)
> 22:02 <johnnagro> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497)
> 22:02 <johnnagro> this happened on the server, yes.
> Looking into the code, it seems that HierarchicalLedgerManager doesn't consider idgen to be special. This is a race, between the idgen node being created and the znodes underneath being listed. The znodes underneath should never be listed.
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