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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6980) Parallel Flushing Of Memstores [89-fb]
Date Tue, 30 Oct 2012 21:28:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487266#comment-13487266

Kannan Muthukkaruppan commented on HBASE-6980:

@ Todd: any comments on by 17/Oct comment regarding RS expiry handling and flush marker?
> Parallel Flushing Of Memstores [89-fb]
> --------------------------------------
>                 Key: HBASE-6980
>                 URL: https://issues.apache.org/jira/browse/HBASE-6980
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Kannan Muthukkaruppan
>             Fix For: 0.89-fb
> For write dominated workloads, single threaded memstore flushing is an unnecessary bottleneck.
With a single flusher thread, we are basically not setup to take advantage of the aggregate
throughput that multi-disk nodes provide.
> * For puts with WAL enabled, the bottleneck is more likely the "single" WAL per region
server. So this particular fix may not buy as much unless we unlock that bottleneck with multiple
commit logs per region server. (Topic for a separate JIRA-- HBASE-6981).
> * But for puts with WAL disabled (e.g., when using HBASE-5783 style fast bulk imports),
we should be able to support much better ingest rates with parallel flushing of memstores.

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