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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5397) Updates to PerRowSecondaryIndex don't use most current values
Date Thu, 04 Apr 2013 17:05:16 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sam Tunnicliffe updated CASSANDRA-5397:
---------------------------------------

    Attachment: 5397-1.2-v4.txt
    
> Updates to PerRowSecondaryIndex don't use most current values 
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-5397
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5397
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.3
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Minor
>         Attachments: 5397_12.txt, 5397-1.2-v3.txt, 5397-1.2-v4.txt, 5397_trunk.txt, 5397.txt
>
>
> The way that updates to secondary indexes are performed using  SecondaryIndexManager.Updater
is flawed for PerRowSecondaryIndexes.  Unlike PerColumnSecondaryIndexes, which only require
the old & new values for a single column,  the expectation is that a PerRow indexer can
be given just a key which it will use to retrieve the entire row (or as many columns as it
requires) and perform its indexing on those columns.  As the indexes are updated before the
memtable atomic swap occurs, a per-row indexer may only read the previous values for the row,
not the new ones that are being written. In the case of an insert, there is no previous value
and so nothing is added to the index.

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