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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4116) check most recent TS values in SSTables when a row tombstone has already been encountered
Date Sat, 28 Apr 2012 19:34:49 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sam Tunnicliffe updated CASSANDRA-4116:
---------------------------------------

    Attachment: v1-0002-CASSANDRA-4116-Set-SSTable-maxTimestamp-correctly-for-.txt
                v1-0001-CASSANDRA-4116-After-Row-tombstone-skip-earlier-SSTabl.txt
    
> check most recent TS values in SSTables when a row tombstone has already been encountered
> -----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4116
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4116
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Matthew F. Dennis
>            Assignee: Sam Tunnicliffe
>         Attachments: v1-0001-CASSANDRA-4116-After-Row-tombstone-skip-earlier-SSTabl.txt,
v1-0002-CASSANDRA-4116-Set-SSTable-maxTimestamp-correctly-for-.txt
>
>
> once C* comes across a row tombstone, C* should check the TS on the tombstone against
all SSTables.  If the most recent TS in an SST is older than the row tombstone, that entire
SST (or the remainder of it) can be safely ignored.
> There are two drivers for this.
> * avoid checking column values that could not possibly be in the result set
> * avoid OOMing because all the tombstones are temporarily kept in memory.

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