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https://issues.apache.org/jira/browse/HBASE-12070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephen Yuan Jiang updated HBASE-12070:
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Status: Patch Available (was: In Progress)
> Add an option to hbck to fix ZK inconsistencies
> -----------------------------------------------
>
> Key: HBASE-12070
> URL: https://issues.apache.org/jira/browse/HBASE-12070
> Project: HBase
> Issue Type: Bug
> Components: hbck
> Affects Versions: 1.1.0
> Reporter: Sudarshan Kadambi
> Assignee: Stephen Yuan Jiang
> Fix For: 1.1.0
>
> Attachments: HBASE-12070.v1-branch-1.patch,
> HBASE-12070.v2-branch-1.patch
>
>
> If the HMaster bounces in the middle of table creation, we could be left in a
> state where a znode exists for the table, but that hasn't percolated into
> META or to HDFS. We've run into this a couple times on our clusters. Once the
> table is in this state, the only fix is to rm the znode using the
> zookeeper-client. Doing this manually looks a bit error prone. Could an
> option be added to hbck to catch and fix such inconsistencies?
> A more general issue I'd like comment on is whether it makes sense for
> HMaster to be maintaining its own write-ahead log? The idea would be that on
> a bounce, the master would discover it was in the middle of creating a table
> and either rollback or complete that operation? An issue that we observed
> recently was that a table that was in DISABLING state before a bounce was not
> in that state after. A write-ahead log to persist table state changes seems
> useful. Now, all of this state could be in ZK instead of the WAL - it doesn't
> matter where it gets persisted as long as it does.
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