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From "Andrey Stepachev (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7767) Get rid of ZKTable, and table enable/disable state in ZK
Date Thu, 21 Aug 2014 08:51:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrey Stepachev updated HBASE-7767:
------------------------------------

    Attachment: HBASE-7767.patch


Patch is quite big, but what was done.
1. Table state stored in .tableinfo. HTableDescriptor now has TABLE_STATE parameter.
2. Added TableState and inner enum State.
3. Added MasterRPC getTableState (which supersedes isTableEnabled/isTableDisabled, now getTableState
returns enum)
4. TableStateManager removed from public api and become helper private class (similar to TableNamespaceManager)
5. TableStateManager caches reads and updates cache on writes. 
6. TableStateManager doesn’t use table locks for modifications, caller should ensure, that
table locked. That is because TableLocks not reentrant. An option is to add boolean, but currently
TableStateManager used in master only as helper class.
5. Table state also available through HTableDescriptor, but can’t be altered. enable/disable
RPC call should be used.
6. Removed TableState from ZookeeperProtos.
7. Removed methods for table availability from Registry.
7. Removed TableStateManager from CoordinatedStateManager (now master is responsible for table
state)

Rationale for additional method: currently getTableDecriptor method wants fully initialised
HMaster, but table state requests are used before master fully initialised. Added method waits
only HMaster ’started’ status. 

> Get rid of ZKTable, and table enable/disable state in ZK 
> ---------------------------------------------------------
>
>                 Key: HBASE-7767
>                 URL: https://issues.apache.org/jira/browse/HBASE-7767
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Zookeeper
>    Affects Versions: 2.0.0
>            Reporter: Enis Soztutar
>            Assignee: Andrey Stepachev
>         Attachments: HBASE-7767.patch
>
>
> As discussed table state in zookeeper for enable/disable state breaks our zookeeper contract.
It is also very intrusive, used from the client side, master and region servers. We should
get rid of it. 



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