[jira] [Resolved] (STORM-703) RedisMapState with hash key can cause network overload

["Robert Joseph Evans (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STORM-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Joseph Evans resolved STORM-703.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 0.11.0

Thanks [~dkatten],

I merged this into master, and re numbered the version to be 0.11.0, as there is already a 0.10.x branch.  If you want this to go into 0.10.0 please let me know and I will cherry-pick it in.

> RedisMapState with hash key can cause network overload
> ------------------------------------------------------
>
>                 Key: STORM-703
>                 URL: https://issues.apache.org/jira/browse/STORM-703
>             Project: Apache Storm
>          Issue Type: Bug
>          Components: external
>    Affects Versions: 0.10.0
>            Reporter: Dave Katten
>            Assignee: Dave Katten
>             Fix For: 0.11.0
>
>
> When RedisMapState is constructed to use a hash key (and store values under a hash in redis, rather than as key/value pairs in the top namespace), a multiGet actually requests ALL of the state in that hash, instead of only the keys in the batch. 
> As the size of the hash grows in redis, this becomes an inordinate amount of traffic, and can cause interfaces to fall over.
> * Solution
> Instead of calling jedis.hgetall(hash), call jedis.hmget(hash, stringKeys[]). Also, remove the buildValuesFromMap function, as it is no longer needed.
> See PR#462 on github.
> https://github.com/apache/storm/pull/462



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