[jira] [Commented] (GEODE-4079) Deprecate Hash Index and Hash Index APIs

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GEODE-4079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349402#comment-16349402 ] 

ASF subversion and git services commented on GEODE-4079:
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Commit a4abc21e57596deeb3b6366fa10c0acdd6a0f0df in geode's branch refs/heads/master from [~dbarnes97]
[ https://gitbox.apache.org/repos/asf?p=geode.git;h=a4abc21 ]

GEODE-4079 Identify hash indexes as deprecated in docs for gfsh create index command


> Deprecate Hash Index and Hash Index APIs
> ----------------------------------------
>
>                 Key: GEODE-4079
>                 URL: https://issues.apache.org/jira/browse/GEODE-4079
>             Project: Geode
>          Issue Type: Bug
>          Components: docs, querying
>            Reporter: Jason Huynh
>            Assignee: Karen Smoler Miller
>            Priority: Major
>             Fix For: 1.4.0
>
>
> As discussed on the user and dev list, we should deprecate the Hash Index and the corresponding Hash Index APIs.
> The proposal:
> Currently the Hash Index name causes confusion. It is not a traditional hash look up index, but more of memory savings index.  The index does not store index keys in memory and must hash the keys every time.  The index synchronizes on a backing array and when the backing array needs to be expanded, it currently needs to rehash all elements in the array.  This can be very problematic for larger data sets.
> There were improvements made to one of the functional indexes (compact range index) prior to open sourcing.  These improvements helped reduce the memory consumption of that index and makes it very similar sized to a hash index, but the keys still are stored in memory.  Probably close enough to be a replacement for the hash index in most cases.  The read/write performance on it is also faster than the hash index.
> This works includes:
> Deprecating the Hash Index Class
> Deprecating the createHashIndex API's in query Service
> Deprecating the Hash Index type in IndexTypes (if possible)
> Deprecating the gfsh commands to create hash index and hash index types



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