HierarchicalLedgerManager doesn't consider idgen as a "specialNode"
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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
>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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