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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-70) Improve region server memory management
Date Wed, 09 Apr 2008 04:27:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-70?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587048#action_12587048
] 

stack commented on HBASE-70:
----------------------------

One place that puts up memory pressure is in memcache scanners; each outstanding scanner carries
a copy of the state of memcache at time scanner was taken out.

> Improve region server memory management
> ---------------------------------------
>
>                 Key: HBASE-70
>                 URL: https://issues.apache.org/jira/browse/HBASE-70
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: stack
>             Fix For: 0.2.0
>
>
> Each Store has a Memcache of edits that is flushed on a fixed period (It used to be flushed
when it grew beyond a limit). A Region can be made up of N Stores.  A regionserver has no
upper bound on the number of regions that can be deployed to it currently.  Add to this that
per mapfile, we have read the index into memory.  We're also talking about adding caching
of blocks and cells.
> We need a means of keeping an account of memory usage adjusting cache sizes and flush
rates (or sizes) dynamically -- using References where possible -- to accomodate deployment
of added regions.  If memory is strained, we should reject regions proffered by the master
with a resouce-constrained, or some such, message.
> The manual sizing we currently do ain't going to cut it for clusters of any decent size.

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