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https://issues.apache.org/jira/browse/HBASE-14004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044563#comment-15044563
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Heng Chen commented on HBASE-14004:
-----------------------------------
Looks good. Except one thing.
{code}
If we get timeout error finally, we should open a new file and write/hflush all
data in buffer to it and use a background thread to close old file using any
length that larger than the previous succeeded hflushed length.
{code}
IIRC, we should ensure seqId of WAL edits increased. Otherwise, we will
failed when replay WALs.
Some entries in new WAL may have smaller seqid than entries in old WAL as our
logical, right?
> [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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