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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HBASE-14995) Optimize setting tagsPresent in DefaultMemStore.java
Date Thu, 17 Dec 2015 05:54:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu reopened HBASE-14995:
----------------------------

> Optimize setting tagsPresent in DefaultMemStore.java
> ----------------------------------------------------
>
>                 Key: HBASE-14995
>                 URL: https://issues.apache.org/jira/browse/HBASE-14995
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 2.0.0, 1.2.0
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>            Priority: Minor
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-14995-v001.patch, HBASE-14995-v002.patch
>
>
> The current implementation calls e.getTagsLength() for each cell. Once tagsPresent is
set, e.getTagsLength() can be avoided.
> {code}
>   private boolean addToCellSet(Cell e) {
>     boolean b = this.cellSet.add(e);
>     // In no tags case this NoTagsKeyValue.getTagsLength() is a cheap call.
>     // When we use ACL CP or Visibility CP which deals with Tags during
>     // mutation, the TagRewriteCell.getTagsLength() is a cheaper call. We do not
>     // parse the byte[] to identify the tags length.
>     if(e.getTagsLength() > 0) {
>       tagsPresent = true;
>     }
>     setOldestEditTimeToNow();
>     return b;
>   }
> {code}



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