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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org> on 2015/10/21 06:51:27 UTC

[jira] [Comment Edited] (HBASE-14643) Avoid Splits from once again opening a closed reader for fetching the first and last key

    [ https://issues.apache.org/jira/browse/HBASE-14643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14966236#comment-14966236 ] 

ramkrishna.s.vasudevan edited comment on HBASE-14643 at 10/21/15 4:50 AM:
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[~chenheng]
Pushed to master along with the nit that Elliot suggested.  Could you prepare a patch for branch 1.2 and branch 1?  The master patch does not apply cleanly using the cherry-pick command of git.  If you don't have spare time, let me know I will rebase the patch accordingly. Thanks.



was (Author: ram_krish):
[~chenheng]
Pushed to master along with the nit that Elliot suggested.  Could you prepare a patch for branch 1.2 and branch 1.3?  The master patch does not apply cleanly using the cherry-pick command of git.  If you don't have spare time, let me know I will rebase the patch accordingly. Thanks.


> 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
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-14643.patch, HBASE-14643_v1.patch, HBASE-14643_v2.patch, HBASE-14643_v3.patch, HBASE-14643_v4.patch, HBASE-14643_v5.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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