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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15648) Reduce number of concurrent region location lookups when MetaCache entry is cleared
Date Tue, 26 Apr 2016 18:29:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258640#comment-15258640
] 

stack commented on HBASE-15648:
-------------------------------

How to move forward on this one?

> Reduce number of concurrent region location lookups when MetaCache entry is cleared
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-15648
>                 URL: https://issues.apache.org/jira/browse/HBASE-15648
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>    Affects Versions: 1.3.0
>            Reporter: Mikhail Antonov
>            Assignee: Mikhail Antonov
>             Fix For: 1.3.0
>
>         Attachments: HBASE-15648-branch-1.3.v1.patch
>
>
> It seems in HConnectionImplementation#locateRegionInMeta if region location is removed
from the cache, with large number of client threads we could have many of them getting cache
miss and doing meta scan, which looks unnecessary - we could empty mechanism similar to what
we have in IdLock in HFileReader to fetch the block to cache, do ensure that if one thread
is already looking up location for region R1, other threads who need it's location wait until
first thread finishes his work.



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