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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10775) SSTable compression ratio is not serialized properly
Date Fri, 27 Nov 2015 09:16:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029652#comment-15029652
] 

Benjamin Lerer commented on CASSANDRA-10775:
--------------------------------------------

||2.2||3.0||trunk||
|[utest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-2.2-testall/1/] |[utest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-3.0-testall/1/]|[utest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-trunk-testall/1/]|
|[dtest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-2.2-dtest/1/]|[dtest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-3.0-dtest/3/]|[dtest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10775-trunk-dtest/lastCompletedBuild/testReport/]|

The only failing dtest related to compression is {{jmxmetrics_test.TestJMXMetrics.begin_test}}.
As explained in CASSANDRA-10225 the compression assertion is , in my opinion, just wrong.
I removed it from the DTest. 

> SSTable compression ratio is not serialized properly
> ----------------------------------------------------
>
>                 Key: CASSANDRA-10775
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10775
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>             Fix For: 3.0.x, 3.x
>
>         Attachments: 10775-2.2.txt
>
>
> While reviewing CASSANDRA-10225, I found out that the compression ratio returned by the
{{StatsMetadata}} for some compressed sstables was - 1 (NO_COMPRESSION_RATIO). 
> After investigation it seems that the wrong compression ratio was serialized to disk.




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