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https://issues.apache.org/jira/browse/HBASE-14004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14978004#comment-14978004
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Yu Li commented on HBASE-14004:
-------------------------------
{quote}
It's possible that the HDFS sync RPC call fails, but the data is already (may
partially) transported to the DNs which finally get persisted
{quote}
Does this really happen on your cluster or it's just an assumption
[~heliangliang] [~chenheng]?
>From what I could see we will get EOFException when trying to read partially
>written entries (those larger than 64k and split into multiple packets and
>some packets got lost due to network or dfs error) and these entries will be
>abandoned during replication.
If in real case the sync RPC call fails but data somehow persisted, it's more
like a bug in HDFS or error usage in HBase (like not handling all possible
exceptions, etc.). I'd suggest to dig deeper into this first before any further
discussion.
> [Replication] Inconsistency between Memstore and WAL may result in data in
> remote cluster that is not in the origin
> -------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-14004
> URL: https://issues.apache.org/jira/browse/HBASE-14004
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: He Liangliang
> Priority: Critical
> Labels: replication, wal
>
> Looks like the current write path can cause inconsistency between
> memstore/hfile and WAL which cause the slave cluster has more data than the
> master cluster.
> The simplified write path looks like:
> 1. insert record into Memstore
> 2. write record to WAL
> 3. sync WAL
> 4. rollback Memstore if 3 fails
> It's possible that the HDFS sync RPC call fails, but the data is already
> (may partially) transported to the DNs which finally get persisted. As a
> result, the handler will rollback the Memstore and the later flushed HFile
> will also skip this record.
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