[jira] [Resolved] (GEODE-3701) Improve docs on hash index performance

["Karen Smoler Miller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GEODE-3701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karen Smoler Miller resolved GEODE-3701.
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    Resolution: Fixed

> Improve docs on hash index performance
> --------------------------------------
>
>                 Key: GEODE-3701
>                 URL: https://issues.apache.org/jira/browse/GEODE-3701
>             Project: Geode
>          Issue Type: Improvement
>            Reporter: Karen Smoler Miller
>            Assignee: Karen Smoler Miller
>             Fix For: 1.3.0
>
>
> Stronger language is warranted for hash indexes.
> In a simple test, there was an order of magnitude difference in load and GII performance between the two types of indexes.
> Range:
> Client: Loaded 2,000,000 entries in 20,487 ms
> Server 1 Size: 1,272,322,680 bytes
> Server 2: GIIed in 12,523 ms
> Server 2 Size: 1,272,088,544 bytes
> Hash:
> Client: Loaded 2,000,000 entries in 257,016 ms
> Server 1 Size: 1,228,010,280 bytes
> Server 2: GIIed in 218,983 ms
> Server 2 Size: 1,228,161,664 bytes
> So, the difference in size was ~45MB, but the difference in time was an order of magnitude.
> Better wording suggested for file developing/query_index/creating_hash_indexes.html:
> Using hash index will degrade put performance and recovery time substantially. If memory is not a concern, it is recommended that you use range index.



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