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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/12/05 05:22:59 UTC
[jira] [Created] (CASSANDRA-5029) Add back bloom filter to LCS
Jonathan Ellis created CASSANDRA-5029:
-----------------------------------------
Summary: Add back bloom filter to LCS
Key: CASSANDRA-5029
URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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[jira] [Commented] (CASSANDRA-5029) Add back bloom filter to LCS
Posted by "Brandon Williams (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510271#comment-13510271 ]
Brandon Williams commented on CASSANDRA-5029:
---------------------------------------------
+1
> Add back bloom filter to LCS
> ----------------------------
>
> Key: CASSANDRA-5029
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 1.2.0 beta 2
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.2.0 rc1
>
> Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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[jira] [Updated] (CASSANDRA-5029) Add back bloom filter to LCS
Posted by "Jonathan Ellis (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-5029:
--------------------------------------
Affects Version/s: 1.2.0 beta 2
Fix Version/s: 1.2.0 rc1
> Add back bloom filter to LCS
> ----------------------------
>
> Key: CASSANDRA-5029
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 1.2.0 beta 2
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.2.0 rc1
>
> Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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[jira] [Updated] (CASSANDRA-5029) Add back bloom filter to LCS
Posted by "Jonathan Ellis (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-5029:
--------------------------------------
Attachment: 5029.txt
> Add back bloom filter to LCS
> ----------------------------
>
> Key: CASSANDRA-5029
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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[jira] [Commented] (CASSANDRA-5029) Add back bloom filter to LCS
Posted by "Jonathan Ellis (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510282#comment-13510282 ]
Jonathan Ellis commented on CASSANDRA-5029:
-------------------------------------------
committed
> Add back bloom filter to LCS
> ----------------------------
>
> Key: CASSANDRA-5029
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 1.2.0 beta 2
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.2.0 rc1
>
> Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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[jira] [Commented] (CASSANDRA-5029) Add back bloom filter to LCS
Posted by "Jonathan Ellis (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510261#comment-13510261 ]
Jonathan Ellis commented on CASSANDRA-5029:
-------------------------------------------
Patch makes LCS default to 0.1 FP, which is half the size (5 buckets vs 10 per row) of the default 0.01 for STCS.
> Add back bloom filter to LCS
> ----------------------------
>
> Key: CASSANDRA-5029
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those. With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.
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