hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18294) Reduce global heap pressure: flush based on heap occupancy
Date Mon, 20 Nov 2017 15:10:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16259334#comment-16259334
] 

ramkrishna.s.vasudevan commented on HBASE-18294:
------------------------------------------------

[~eshcar]
So one basic question. So this change you are seeing after working with CCM and with its index
offheap? And that is why you feel that when we have CCM index offheap and since we don take
the offheap index data in to account we tend to do more flushes?
So we need a counter which accounts for offheap size as a whole (including data and the index
size just for CCM offheap case)? Am I missing something here?

> Reduce global heap pressure: flush based on heap occupancy
> ----------------------------------------------------------
>
>                 Key: HBASE-18294
>                 URL: https://issues.apache.org/jira/browse/HBASE-18294
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Eshcar Hillel
>            Assignee: Eshcar Hillel
>         Attachments: HBASE-18294.01.patch, HBASE-18294.02.patch, HBASE-18294.03.patch,
HBASE-18294.04.patch, HBASE-18294.05.patch, HBASE-18294.06.patch
>
>
> A region is flushed if its memory component exceed a threshold (default size is 128MB).
> A flush policy decides whether to flush a store by comparing the size of the store to
another threshold (that can be configured with hbase.hregion.percolumnfamilyflush.size.lower.bound).
> Currently the implementation (in both cases) compares the data size (key-value only)
to the threshold where it should compare the heap size (which includes index size, and metadata).



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

Mime
View raw message