[
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,
> 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
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
