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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16438) Create a cell type so that chunk id is embedded in it
Date Mon, 03 Apr 2017 07:06:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953063#comment-15953063

ramkrishna.s.vasudevan commented on HBASE-16438:

Ok. Got it now. You are asking for the CellChunk representation. Yes we need chunkId + offset
+ length + seqId. Seqid if embedded with Cell data it is easier to retrieve it. Just doing
getSeqId can decode the value from the backing BB. The only thing is we should go with fixed
8 bytes for that. 
So now if you are going to write the seqId in the BB backing every cell, then the seqId as
the state variable is not needed at all and hence you may need a new cell representation for
it. Otherwise we should still go with it and use the seqID as a caching value in addition
to having it in the BB. 

> 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_8_ChunkCreatorwrappingChunkPool_withchunkRef.patch,
HBASE-16438_9_ChunkCreatorwrappingChunkPool_withchunkRef.patch, HBASE-16438.patch, MemstoreChunkCell_memstoreChunkCreator_oldversion.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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