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From Schubert Zhang <zson...@gmail.com>
Subject Re: Re: Re: compaction slow while sstable>25GB,limitation of thesstablesize?
Date Fri, 30 Apr 2010 17:59:55 GMT
I have ever modify the code to set INDEX_INTERVAL = 512, to decrease the
memory usage. And it seems working fine.
Is it right?

2010/4/30 casablinca126.com <casablinca@126.com>

> hi,
>        It seems changing the INDEX_INTERVAL with conflict with
> AntiEntropyService, right?
>        I will reconstruct my sstables.
>        Thank you, Jonathan!
> cheers,
>        Cao Jiguang
>
>
> ------------------
> casablinca126.com
> 2010-04-30
>
> -------------------------------------------------------------
> 发件人:Jonathan Ellis
> 发送日期:2010-04-29 20:54:03
> 收件人:user@cassandra.apache.org
> 抄送:
> 主题:Re: Re: compaction slow while sstable>25GB,limitation of thesstablesize?
>
> 2010/4/29 casablinca126.com <casablinca@126.com>:
> > Hi,
> > ???燦ow I start to know what's really happenning. The INDEX_INTERVAL(in
> IndexSummary.java) was set to be 4; so at least 1/4
> > of the indices are in the heap. For a node with 20M columns, most of the
> heap is occupied by indices, and of course a poor performance
> > with processing large files.
> > ???營s it possible to modify the INDEX_INTERVAL without reconstruct the
> sstables? I modified the code, 燼nd restart every node,
> > but "NotFoundException()" is reported when read the columns.
>
> No.  INDEX_INTERVAL is not intended to be configurable.  (It is
> all-caps, the convention for constants...)
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

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