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From "Edward Bortnikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16417) In-Memory MemStore Policy for Flattening and Compactions
Date Sun, 21 Aug 2016 13:43:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429726#comment-15429726
] 

Edward Bortnikov commented on HBASE-16417:
------------------------------------------

Notes to the suggested definition: 
1. Speculative scans have been eliminated as merge trigger - turn to be to costly. With option
3 (compact_data), the user takes the responsibility for what he's doing. 

2. The default implementation for immutable sorted index is CellArrayMap (an array of references
to Cell objects). The CellChunkMap implementation embeds the Cell objects into the sorted
index array, and saves some space by doing so. The index implementation is orthogonal to in-memory
flush policy. The CellChunkMap index only works with MSLAB data storage. The use cases for
it are TBD. For example, if it is only planned to work with off-heap data, no separate configuration
is required. Let's follow this up separately on HBase-16421. 
 

> In-Memory MemStore Policy for Flattening and Compactions
> --------------------------------------------------------
>
>                 Key: HBASE-16417
>                 URL: https://issues.apache.org/jira/browse/HBASE-16417
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>




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