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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10648) Pluggable Memstore
Date Tue, 04 Mar 2014 04:14:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918996#comment-13918996

Anoop Sam John commented on HBASE-10648:

bq.Should there be an interface for Memstore so that the default implementation and other
implementations have a common contract ?
Yes.  We have an interface now in the patch.

The main changes in this patch
1. Removed updateColumnValue() from HStore and Memstore. This was used only in tests and there
is a TODO for removal
2. Extracted MemStore as an interface and current Memstore impl moved to an DefaultMemStore
3. For dealing with flush, we had snapshot(), getSnapshot() and clearSnapshot().  This is
changed to snapshot()  , getSnapshotScanner() and clearSnapshot(). getSnapshotScanner() hides
the snapshot DS details within MemStore.
4. MemStore impl can be plugged in by configuring the FQCN against "hbase.regionserver.memstore.class"

> Pluggable Memstore
> ------------------
>                 Key: HBASE-10648
>                 URL: https://issues.apache.org/jira/browse/HBASE-10648
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>         Attachments: HBASE-10648.patch
> Make Memstore into an interface implementation.  Also make it pluggable by configuring
the FQCN of the impl.
> This will allow us to have different impl and optimizations in the Memstore DataStructure
and the upper layers untouched.

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