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Date: Mon, 27 Mar 2017 09:20:41 +0000 (UTC)
From: "ramkrishna.s.vasudevan (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-16438) Create a cell type so that chunk
 id is embedded in it
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archived-at: Mon, 27 Mar 2017 09:20:48 -0000


    [ https://issues.apache.org/jira/browse/HBASE-16438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15942907#comment-15942907 ] 

ramkrishna.s.vasudevan commented on HBASE-16438:
------------------------------------------------

Sorry missed these latest questions/comments.
bq. When CellChunkMap is not in use, may be we dont need to keep this id vs chunk map at all.. How abt we enable this feature iff MSLAB pool is in place? Just asking
I was infact first thinking we could do this CellChunkMap only if there is pool enabled so that there is no need for all this chunkCreation and maintenance overhead. But later as per our discussion it evolved that chunk creations is there when ever MSLAB is on.

bq.In short, Soft References are used in Java to implement caches and objects pointed by soft references can be GCed if no other (hard reference) is pointing to this object.
So the Chunk that is put in the map will have a soft reference? 

> Create a cell type so that chunk id is embedded in it
> -----------------------------------------------------
>
>                 Key: HBASE-16438
>                 URL: https://issues.apache.org/jira/browse/HBASE-16438
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: HBASE-16438_1.patch, HBASE-16438_3_ChunkCreatorwrappingChunkPool.patch, HBASE-16438_4_ChunkCreatorwrappingChunkPool.patch, HBASE-16438.patch, MemstoreChunkCell_memstoreChunkCreator_oldversion.patch, MemstoreChunkCell_trunk.patch
>
>
> For CellChunkMap we may need a cell such that the chunk out of which it was created, the id of the chunk be embedded in it so that when doing flattening we can use the chunk id as a meta data. More details will follow once the initial tasks are completed. 
> Why we need to embed the chunkid in the Cell is described by [~anastas] in this remark over in parent issue https://issues.apache.org/jira/browse/HBASE-14921?focusedCommentId=15244119&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15244119


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