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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, 27 Mar 2017 12:12:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943144#comment-15943144
] 

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

bq.<Long, SoftRef(Chunk)> and <Long, HardRef(Chunk)>.
Yes this type will work. 
bq.All the remaining chunks seems of no use and can be immediate removed from the map.
Yes this will work provided we hit the limit to convert to CellChunkMap. In the case that
was presented here we may not actually grow to that size? Then in that case we will have the
chunks getting referenced?
So if we have this Soft reference way then may it is much easier so when we reallly convert
from CSLM to CellChunkMap that time we can convert the soft ref to hard ref by having another
map in the ChunkCreator. Any soft ref will automatically get removed when the GC tries to
clear them for a GC cycle. 
One doubt - the Soft ref will get cleared only when the OOME is hit?

> 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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