Re: Re: Re: compaction slow while sstable>25GB,limitation of thesstablesize?

[Schubert Zhang <zs...@gmail.com>]

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 <ca...@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
>
> -------------------------------------------------------------
> �����ˣ�Jonathan Ellis
> �������ڣ�2010-04-29 20:54:03
> �ռ��ˣ�user@cassandra.apache.org
> ���ͣ�
> ���⣺Re: Re: compaction slow while sstable>25GB,limitation of thesstablesize?
>
> 2010/4/29 casablinca126.com <ca...@126.com>:
> > Hi,
> > ???�Now 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.
> > ???�Is it possible to modify the INDEX_INTERVAL without reconstruct the
> sstables? I modified the code, �and 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
>