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https://issues.apache.org/jira/browse/HBASE-12672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-12672.
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Resolution: Not A Problem
HBase supports a synchronous replication mode now.
> 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 R. 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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