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https://issues.apache.org/jira/browse/BOOKKEEPER-243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271026#comment-13271026
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Sijie Guo commented on BOOKKEEPER-243:
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@surendra
The error log is noise, it doesn't impact correctness. but I agreed that
Namenode related znodes would be better to move to separated znode.
Beside that, I am thinking how to prevent such error from bookie server side,
e.g. such as preventing creating stale znode in /ledgers znode.
> BK JM : After restart bookkeeper continuously throwing error because BK JM
> create all Namenode related znode under '/ledgers' znode.
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-243
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-243
> Project: Bookkeeper
> Issue Type: Improvement
> Components: bookkeeper-server
> Reporter: surendra singh lilhore
>
> Issue :
> Bookkeeper journal manager create all the Namenode related znode under
> '/ledgers' znode in zookeeper. When bookkeeper read all the ledgers from
> '/ledgers' znode it consider this znode (version, lock, maxtxid) as
> incorrect format ledger and log following error.
> {noformat}
> 2012-04-20 11:52:25,611 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: ledgers
> 2012-04-20 11:52:25,611 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: lock
> 2012-04-20 11:52:25,612 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: maxtxid
> 2012-04-20 11:52:26,613 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: version
> 2012-04-20 11:52:26,613 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: ledgers
> 2012-04-20 11:52:26,613 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: lock
> 2012-04-20 11:52:26,613 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: maxtxid
> 2012-04-20 11:52:27,614 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: version
> 2012-04-20 11:52:27,614 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: ledgers
> 2012-04-20 11:52:27,614 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: lock
> 2012-04-20 11:52:27,615 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: maxtxid
> 2012-04-20 11:52:28,616 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: version
> 2012-04-20 11:52:28,616 - WARN
> [main-EventThread:AbstractZkLedgerManager$2@123] - Error extracting ledgerId
> from ZK ledger node: ledgers
> {noformat}
> I think Namenode related znode should be create in separate znode in
> zookeeper.
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