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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-745) scaling of one regionserver, improving memory and cpu usage
Date Thu, 17 Jul 2008 14:27:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614357#action_12614357
] 

stack commented on HBASE-745:
-----------------------------

LN: I'm not sure I follow the above comment.  What you thinking?  Yes, hbase users need stability
in 0.1.3 and in 0.2.  Lets experiment in 0.3.

No discussion of memory or compaction other than what is in JIRAs.  Want to start up a wiki
page that we can all hack on?

FYI, Izaak is working on upgrading your patch so it works against TRUNK.

> scaling of one regionserver, improving memory and cpu usage
> -----------------------------------------------------------
>
>                 Key: HBASE-745
>                 URL: https://issues.apache.org/jira/browse/HBASE-745
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.1.3, 0.2.0
>         Environment: hadoop 0.17.1
>            Reporter: LN
>            Priority: Minor
>         Attachments: HBASE-745.compact.patch
>
>
> after weeks testing hbase 0.1.3 and hadoop(0.16.4, 0.17.1), i found there are many works
to do,  before a particular regionserver can handle data about 100G, or even more. i'd share
my opions here with stack, and other developers.
> first, the easiest way improving scalability of regionserver is upgrading hardware, use
64bit os and 8G memory for the regionserver process, and speed up disk io. 
> besides hardware, following are software bottlenecks i found in regionserver:
> 1. as data increasing, compaction was eating cpu(with io) times, the total compaction
time is basicly linear relative to whole data size, even worse, sometimes square relavtive
to that size.
> 2. memory usage are depends on opened mapfiles
> 3. network connection are depends on opened mapfiles, see HADOOP-2341 and HBASE-24. 

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