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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14978) Don't allow Multi to retain too many blocks
Date Wed, 29 Mar 2017 15:46:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947372#comment-15947372
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stack commented on HBASE-14978:
-------------------------------

Makes sense [~anoop.hbase] Should be easy enough to verify. We should just not do this trick
when Cell is backed by BucketCache?

> Don't allow Multi to retain too many blocks
> -------------------------------------------
>
>                 Key: HBASE-14978
>                 URL: https://issues.apache.org/jira/browse/HBASE-14978
>             Project: HBase
>          Issue Type: Improvement
>          Components: io, IPC/RPC, regionserver
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Blocker
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-14978-branch-1.2.patch, HBASE-14978-branch-1.2.patch, HBASE-14978-branch-1.2.patch,
HBASE-14978-branch-1.2.patch, HBASE-14978.patch, HBASE-14978-v1.patch, HBASE-14978-v2.patch,
HBASE-14978-v3.patch, HBASE-14978-v4.patch
>
>
> Scans and Multi's have limits on the total size of cells that can be returned. However
if those requests are not all pointing at the same blocks then the KeyValues can keep alive
a lot more data than their size.
> Take the following example:
> A multi with a list of 10000 gets to a fat row. Each column being returned in in a different
block. Each column is small 32 bytes or so.
> So the total cell size will be 32 * 10000 = ~320kb. However if each block is 128k then
total retained heap size will be almost 2gigs.



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