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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14643) Avoid Splits from once again opening a closed reader for fetching the first and last key
Date Mon, 19 Oct 2015 17:18:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963636#comment-14963636
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ramkrishna.s.vasudevan commented on HBASE-14643:
------------------------------------------------

bq.We should flush the Memstore before get StoreFileWrapper...
Oh!! On checking the close() code it does more stuff including holding the lock and then ensuring
proper flush and compaction happens. I think directly doing a flush wil have some implicaitons?
 Because it is only after close() the parent actually stops accepting mutations right?

> Avoid Splits from once again opening a closed reader for fetching the first and last
key
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-14643
>                 URL: https://issues.apache.org/jira/browse/HBASE-14643
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: Heng Chen
>         Attachments: HBASE-14643.patch, HBASE-14643_v1.patch
>
>
> Currently split flow is such that we close the parent region and all its store file readers
are also closed.  After that inorder to split the reference files we need the first and last
keys for which once again open the readers on those store files.  This could be costlier operation
considering the fact that it has to contact the HDFS for this close and open operation. This
JIRA is to see if we can improve this.



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