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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17161) MOB : Make ref cell creation more efficient
Date Fri, 02 Dec 2016 16:19:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715536#comment-15715536
] 

Hudson commented on HBASE-17161:
--------------------------------

SUCCESS: Integrated in Jenkins build HBase-Trunk_matrix #2059 (See [https://builds.apache.org/job/HBase-Trunk_matrix/2059/])
HBASE-17161 MOB : Make ref cell creation more efficient. (anoopsamjohn: rev 4b3ffffa097e5a62063e6bc92bec63bcd91bbef6)
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/util/HFileTestUtil.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java
* (edit) hbase-common/src/main/java/org/apache/hadoop/hbase/CellUtil.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreCompactor.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreFlusher.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HMobStore.java
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHMobStore.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/mob/compactions/PartitionedMobCompactor.java
* (edit) hbase-common/src/main/java/org/apache/hadoop/hbase/TagUtil.java
* (edit) hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValueUtil.java
* (edit) hbase-common/src/main/java/org/apache/hadoop/hbase/ExtendedCell.java


> MOB : Make ref cell creation more efficient
> -------------------------------------------
>
>                 Key: HBASE-17161
>                 URL: https://issues.apache.org/jira/browse/HBASE-17161
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17161.patch, HBASE-17161.patch, HBASE-17161_V2.patch, HBASE-17161_V2.patch
>
>
> When we flush MOB data, ref cells are created per actual MOB cell. This creates lots
of garbage
> Refer MobUtils#createMobRefCell
> We need to add 2 tags into the ref cell. An ArrayList is created with default size creating
ref array. Call to CellUtil.getTags will create a new ArrayList even if the original cell
is having no tags.
> A new KV is created which will create a new backing byte[] and do copy.  Also along with
each of the flush/compaction op, a fresh Tag object is created for TableName tag.
> Fixes include
> 1. A table name tag is not going to change per HStore.  Even both the new tags to be
added.  Will keep a byte[] of these 2 tags at MobHStore level so that all flush and compactions
in this store can use it.
> 2. Create a new MobRefCell just like TagRewriteCell where only value and tags part will
be diff from the original cell.



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