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https://issues.apache.org/jira/browse/GEODE-4079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16289762#comment-16289762
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ASF GitHub Bot commented on GEODE-4079:
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nabarunnag opened a new pull request #1163: GEODE-4079: Deprecated Hash Index
URL: https://github.com/apache/geode/pull/1163
* Added deprecated tags on HashIndex class
* Deprecated createHashIndex calls in QueryService
* Deprecated HASH type in IndexType
* Added to the help text in gfsh create index mentioning hash index
being deprecated since Apache Geode 1.4.0
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> 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
> 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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