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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4401) Record log region splits and region moves in the HLog
Date Wed, 14 Sep 2011 05:58:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104276#comment-13104276
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dhruba borthakur commented on HBASE-4401:
-----------------------------------------

As it stands today, the hlog has only one type of metadata record: (METAROW, METAFAMILY, CACHEFLUSH).
I am proposing that we add more of these (METAROW, METAFAMILY, value) where the value will
encode the following:

RSPLITS: parent-region-id, children region ids
ROPEN: region-id
RCLOSE: region-id

When a region is split, a (METAROW, METAFAMILY, RSPLIT) record will be inserted into the Hlog.
Similarly, when a region migrates from RS1 to RS2, RS1 will insert (METAROW, METAFAMILY, RCLOSE)
in its Hlog and when the region is opened by R2, it will insert (METAROW, METAFAMILY, ROPEN)
in its transaction log.

The replication stream can then follow the region splits/moves in the order they were recorded
in the Hlog to deliver data in order to the remote HBase cluster.

> Record log region splits and region moves in the HLog
> -----------------------------------------------------
>
>                 Key: HBASE-4401
>                 URL: https://issues.apache.org/jira/browse/HBASE-4401
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver, replication
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> It would be nice to record a region splits, region close and region open in the transaction
log. This will help in  in-order delivery of changes for HBase cluster replication.

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