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From: Wei Zhu wz1...@yahoo.com
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:35:29 AM
Subject: Re: About the heap
Hi Dean,
The index_interval is controlling the sampling of the SSTable to speed up
the lookup of the keys in the SSTable. Here is the code:
https
the ancestor.
https://issues.apache.org/jira/browse/CASSANDRA-5342
-Wei
- Original Message -
From: Wei Zhu wz1...@yahoo.com
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:35:29 AM
Subject: Re: About the heap
Hi Dean,
The index_interval is controlling
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:35:29 AM
Subject: Re: About the heap
Hi Dean,
The index_interval is controlling the sampling of the SSTable to speed up
the lookup of the keys in the SSTable. Here is the code:
https://github.com/apache/cassandra/blob/trunk/src
.
https://issues.apache.org/jira/browse/CASSANDRA-5342
-Wei
- Original Message -
From: Wei Zhu wz1...@yahoo.com
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:35:29 AM
Subject: Re: About the heap
Hi Dean,
The index_interval is controlling the sampling
Going to 1.2.2 helped us quite a bit as well as turning on LCS from STCS which
gave us smaller bloomfilters.
As far as key cache. There is an entry in cassandra.yaml called index_interval
set to 128. I am not sure if that is related to key_cache. I think it is. By
turning that to 512 or
called index_interval set to 128
I think this is for BloomFilters actually.
2013/3/13 Hiller, Dean dean.hil...@nrel.gov
Going to 1.2.2 helped us quite a bit as well as turning on LCS from STCS
which gave us smaller bloomfilters.
As far as key cache. There is an entry in cassandra.yaml
/SSTableMetadata.java#L58
Enjoy looking at Cassandra code:)
-Wei
- Original Message -
From: Dean Hiller dean.hil...@nrel.gov
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:11:14 AM
Subject: Re: About the heap
Going to 1.2.2 helped us quite a bit as well as turning on LCS from STCS
You can trigger minor compaction on an individual SStable file when the
percentage of tombstones in that Sstable crosses a user-defined threshold.
We have just one cf with TTL. I don't think the problem comes from there.
Peaks may be occurring during compaction, when Sstable files are
memmapped.
- Original Message -
From: Alain RODRIGUEZ arodr...@gmail.com
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:28:28 AM
Subject: Re: About the heap
called index_interval set to 128
I think this is for BloomFilters actually.
2013/3/13 Hiller, Dean dean.hil...@nrel.gov
Here is the JIRA I submitted regarding the ancestor.
https://issues.apache.org/jira/browse/CASSANDRA-5342
-Wei
- Original Message -
From: Wei Zhu wz1...@yahoo.com
To: user@cassandra.apache.org
Sent: Wednesday, March 13, 2013 11:35:29 AM
Subject: Re: About the heap
Hi Dean
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