[ https://issues.apache.org/jira/browse/GEODE-4079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293288#comment-16293288 ]
ASF subversion and git services commented on GEODE-4079: -------------------------------------------------------- Commit 59b949ee6afa7750e6f66c380724639a337b6f1f in geode's branch refs/heads/develop from [~nnag] [ https://gitbox.apache.org/repos/asf?p=geode.git;h=59b949e ] GEODE-4079: Deprecated Hash Index * 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 > 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 -- This message was sent by Atlassian JIRA (v6.4.14#64029)