[jira] [Commented] (HBASE-21202) Investigate sync-replication

["Duo Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16618366#comment-16618366 ] 

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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