[jira] [Updated] (HBASE-17161) MOB : Make ref cell creation more efficient

["Anoop Sam John (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-17161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anoop Sam John updated HBASE-17161:
-----------------------------------
    Attachment: HBASE-17161_V2.patch

This is what planning to commit. Only diff from V1 is heapSize() calc which makes use of ClassSize.sizeOf(byte[], int) util API .


> 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
>
>
> 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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