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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3653) Parallelize Server Requests on HBase Client
Date Wed, 16 Mar 2011 02:13:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007315#comment-13007315
] 

Nicolas Spiegelberg commented on HBASE-3653:
--------------------------------------------

note: because we were completely Network IO saturated, we were seeing 10-20 second RPC delays
per RS due to dropped packets.  Serialize this across 100 RS == massive delay.  Went from
3 min -> 15 sec

> Parallelize Server Requests on HBase Client
> -------------------------------------------
>
>                 Key: HBASE-3653
>                 URL: https://issues.apache.org/jira/browse/HBASE-3653
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.2, 0.92.0
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>             Fix For: 0.90.2, 0.92.0
>
>         Attachments: HBASE-3653.patch
>
>
> Vastly improves HBCK performance. Although we are parallelizing getRegionAssignment()
calls, getHRegionConnection()
> gets a big lock. Cache misses can be expensive on heavily-loaded servers because they
need to setup a proxy connection. This hurts cache hits on a cache miss & serializes all
cache misses. We should parallelize both situations.

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