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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15654) Optimize client's MetaCache handling
Date Fri, 15 Apr 2016 00:14:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15242188#comment-15242188
] 

Mikhail Antonov commented on HBASE-15654:
-----------------------------------------

[~vrodionov] yeah.. it's closely related, and while my goal in this jira is to reduce the
request load on meta which swarm of client could cause I also want to make sure performance
of MetaCache is intact, especially as I'm planning to change some locking around lookups.

Do you think we should move it as subtask here?

> Optimize client's MetaCache handling
> ------------------------------------
>
>                 Key: HBASE-15654
>                 URL: https://issues.apache.org/jira/browse/HBASE-15654
>             Project: HBase
>          Issue Type: Umbrella
>          Components: Client
>    Affects Versions: 1.3.0
>            Reporter: Mikhail Antonov
>            Assignee: Mikhail Antonov
>             Fix For: 1.3.0
>
>
> This is an umbrella jira to track all individual issues, bugfixes and small optimizations
around MetaCache (region locations cache) in the client. Motivation is that under the load
one could see a spikes in the number of requests going to meta - reaching tens of thousands
requests per second.
> That covers issues when we clear entries from location cache unnecessary, as well as
when we do more lookups than necessary when entries are legitimately evicted.



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