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https://issues.apache.org/jira/browse/HBASE-21202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16618366#comment-16618366
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Duo Zhang commented on HBASE-21202:
-----------------------------------
I think the correct place to implement the sync replication related wal logic
is on top of the WAL interface. We will setup two WAL instances for a region,
and write to them all. Now the logic is implemented at the AsyncWriter layer.
But I think the current sync method should be changed to return a
CompletableFuture instead of waiting forever until succeeded, otherwise it will
hurt the performance of sync replication.
> Investigate sync-replication
> ----------------------------
>
> Key: HBASE-21202
> URL: https://issues.apache.org/jira/browse/HBASE-21202
> Project: HBase
> Issue Type: Sub-task
> Reporter: Josh Elser
> Priority: Major
>
> Need to understand what the synchronous replication feature requires out of a
> WAL and make sure that the changes made to support the LogService are in line
> with how the synchronous replication feature works.
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