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Date: Tue, 22 Mar 2016 05:17:25 +0000 (UTC)
From: "Vladimir Rodionov (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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 <JIRA.12951935.1458536715351@arcas>
Subject: [jira] [Updated] (HBASE-15493) Default ArrayList size may not be
 optimal for Mutation
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     [ https://issues.apache.org/jira/browse/HBASE-15493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Rodionov updated HBASE-15493:
--------------------------------------
    Attachment: HBASE-15493-v2.patch

> Default ArrayList size may not be optimal for Mutation
> ------------------------------------------------------
>
>                 Key: HBASE-15493
>                 URL: https://issues.apache.org/jira/browse/HBASE-15493
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, regionserver
>    Affects Versions: 2.0.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15493-v1.patch, HBASE-15493-v2.patch
>
>
> {code}
>   List<Cell> getCellList(byte[] family) {
>     List<Cell> list = this.familyMap.get(family);
>     if (list == null) {
>       list = new ArrayList<Cell>();
>     }
>     return list;
>   }
> {code}
> Creates list of size 10, this is up to 80 bytes per column family in mutation object. 
> Suggested:
> {code}
>   List<Cell> getCellList(byte[] family) {
>     List<Cell> list = this.familyMap.get(family);
>     if (list == null) {
>       list = new ArrayList<Cell>(CELL_LIST_INITIAL_CAPACITY);
>     }
>     return list;
>   }
> {code}
> CELL_LIST_INITIAL_CAPACITY = 2 in the patch, this is debatable. For mutation where every CF has 1 cell, this gives decent reduction in memory allocation rate in both client and server during write workload. ~2%, not a big number, but as I said, already, memory optimization will include many small steps.



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