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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12672) Support optionally replicating a table synchronously
Date Fri, 12 Dec 2014 17:58:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14244524#comment-14244524
] 

Lars Hofhansl commented on HBASE-12672:
---------------------------------------

That how it works now: The queue is the WAL. Once the edit is in the WAL it will be made visible
to reader and it will eventually be shipped to the secondary.

Is what you mean is:
# put it in the queue (but it's *not* visible to any readers)
# only once the edit is applied on the secondary we make it visible in the primary

?


> Support optionally replicating a table synchronously
> ----------------------------------------------------
>
>                 Key: HBASE-12672
>                 URL: https://issues.apache.org/jira/browse/HBASE-12672
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Priority: Minor
>
> Sometimes a table may contain state in which it's crucial to know that replication occurred
before continuing with the update. Though this would mean that you'd block updates to this
table if your secondary cluster was unavailable, that might be a tradeoff that a user would
be willing to make. An example would be in support of SQL sequences. See this thread (http://s.apache.org/fTP)
and PHOENIX-1422 for more discussion and context.



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