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https://issues.apache.org/jira/browse/HBASE-5904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274084#comment-13274084
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stack commented on HBASE-5904:
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@Ram As I read it above, we are about backing out hbase-5155 Thats what your
patch does David? If so, I'm +1 on applying it to 0.90.
> is_enabled from shell returns differently from pre- and post- HBASE-5155
> ------------------------------------------------------------------------
>
> Key: HBASE-5904
> URL: https://issues.apache.org/jira/browse/HBASE-5904
> Project: HBase
> Issue Type: Bug
> Components: zookeeper
> Affects Versions: 0.90.6
> Reporter: David S. Wang
> Assignee: David S. Wang
> Fix For: 0.90.7
>
> Attachments: HBASE-5904.patch
>
>
> If I launch an hbase shell that uses HBase and ZooKeeper without HBASE-5155,
> against HBase servers with HBASE-5155, then is_enabled for a table always
> returns false even if the table is considered enabled by the servers from the
> logs. If I then do the same thing but with an HBase shell and ZooKeeper with
> HBASE-5155, then is_enabled returns as expected.
> If I launch an HBase shell that uses HBase and ZooKeeper without HBASE-5155,
> against HBase servers also without HBASE-5155, then is_enabled works as you'd
> expect. But if I then do the same thing but with an HBase shell and
> ZooKeeper with HBASE-5155, then is_enabled returns false even though the
> table is considered enabled by the servers from the logs.
> Additionally, if I then try to enable the table from the
> HBASE-5155-containing shell, it hangs because the ZooKeeper code waits for
> the ZNode to be updated with "ENABLED" in the data field, but what actually
> happens is that the ZNode gets deleted since the servers are running without
> HBASE-5155.
> I think the culprit is that the indication of how a table is considered
> enabled inside ZooKeeper has changed with HBASE-5155. Before HBASE-5155, a
> table was considered enabled if the ZNode for it did not exist. After
> HBASE-5155, a table is considered enabled if the ZNode for it exists and has
> "ENABLED" in its data. I think the current code is incompatible when running
> clients and servers where one side has HBASE-5155 and the other side does not.
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