[jira] [Assigned] (CASSANDRA-12922) Bloom filter miss counts are not measured correctly

2021-07-14 Thread Benjamin Lerer (Jira) 


 [ 
https://issues.apache.org/jira/browse/CASSANDRA-12922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Benjamin Lerer reassigned CASSANDRA-12922:
--

Assignee: Aleksei Zotov  (was: Benjamin Lerer)

> Bloom filter miss counts are not measured correctly
> ---
>
> Key: CASSANDRA-12922
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12922
> Project: Cassandra
>  Issue Type: Bug
>  Components: Legacy/Local Write-Read Paths
>Reporter: Branimir Lambov
>Assignee: Aleksei Zotov
>Priority: Normal
>  Labels: lhf
> Fix For: 4.x
>
> Attachments: 12922-trunk.txt
>
>
> Bloom filter hits and misses are evaluated incorrectly in 
> {{BigTableReader.getPosition}}: we properly record hits, but not misses. In 
> particular, if we don't find a match for a key in the index, which is where 
> almost all non-matches will be rejected, [we don't record a bloom filter 
> false 
> positive|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/format/big/BigTableReader.java#L228].
> This leads to very misleading output from e.g. {{nodetool tablestats}}.



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[jira] [Assigned] (CASSANDRA-12922) Bloom filter miss counts are not measured correctly

2021-07-02 Thread Benjamin Lerer (Jira) 


 [ 
https://issues.apache.org/jira/browse/CASSANDRA-12922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Benjamin Lerer reassigned CASSANDRA-12922:
--

Assignee: Benjamin Lerer  (was: Sundar Srinivasan)

> Bloom filter miss counts are not measured correctly
> ---
>
> Key: CASSANDRA-12922
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12922
> Project: Cassandra
>  Issue Type: Bug
>  Components: Legacy/Local Write-Read Paths
>Reporter: Branimir Lambov
>Assignee: Benjamin Lerer
>Priority: Normal
>  Labels: lhf
> Fix For: 4.x
>
> Attachments: 12922-trunk.txt
>
>
> Bloom filter hits and misses are evaluated incorrectly in 
> {{BigTableReader.getPosition}}: we properly record hits, but not misses. In 
> particular, if we don't find a match for a key in the index, which is where 
> almost all non-matches will be rejected, [we don't record a bloom filter 
> false 
> positive|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/format/big/BigTableReader.java#L228].
> This leads to very misleading output from e.g. {{nodetool tablestats}}.



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[jira] [Assigned] (CASSANDRA-12922) Bloom filter miss counts are not measured correctly

2016-11-21 Thread Mahdi Mohammadi (JIRA) 

 [ 
https://issues.apache.org/jira/browse/CASSANDRA-12922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mahdi Mohammadi reassigned CASSANDRA-12922:
---

Assignee: Mahdi Mohammadi

> Bloom filter miss counts are not measured correctly
> ---
>
> Key: CASSANDRA-12922
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12922
> Project: Cassandra
>  Issue Type: Bug
>Reporter: Branimir Lambov
>Assignee: Mahdi Mohammadi
>
> Bloom filter hits and misses are evaluated incorrectly in 
> {{BigTableReader.getPosition}}: we properly record hits, but not misses. In 
> particular, if we don't find a match for a key in the index, which is where 
> almost all non-matches will be rejected, [we don't record a bloom filter 
> false 
> positive|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/format/big/BigTableReader.java#L228].
> This leads to very misleading output from e.g. {{nodetool tablestats}}.



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