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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12030) Range tombstones that are masked by row tombstones should not be written out
Date Wed, 06 Jul 2016 09:23:11 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-12030:
-----------------------------------------
    Reviewer: Sylvain Lebresne

> Range tombstones that are masked by row tombstones should not be written out
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-12030
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12030
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Nachiket Patil
>            Assignee: Nachiket Patil
>            Priority: Minor
>         Attachments: cassandra-12030-2.1.diff, cassandra-12030-2.2.diff
>
>
> During compaction, if a table has range tombstone and a row delete with higher timestamp
than range tombstone, both are written out to disk. Some problems seen because of this behavior:
> 1. The Range tombstone is expensive to maintain.
> 2. Range queries see timeouts when there are too many range tombstones present which
may be masked by row tombstones.
> This can be avoided with simple optimization to not write out range tombstone if it is
masked by row delete.



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