[jira] [Assigned] (CASSANDRA-10547) Updating a CQL List many times creates many tombstones

["Alex Petrov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-10547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Petrov reassigned CASSANDRA-10547:
---------------------------------------

    Assignee: Alex Petrov

> Updating a CQL List many times creates many tombstones 
> -------------------------------------------------------
>
>                 Key: CASSANDRA-10547
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10547
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 2.1.9, Java driver 2.1.5
>            Reporter: James Bishop
>            Assignee: Alex Petrov
>         Attachments: tombstone.snippet
>
>
> We encountered a TombstoneOverwhelmingException in cassandra system.log which caused some of our CQL queries to fail.
> We are able to reproduce this issue by updating a CQL List column many times. The number of tombstones created seems to be related to (number of list items * number of list updates). We update the entire list on each update using the java driver. (see attached code for details)
> Running nodetool compact does not help, but nodetool flush does. It appears that the tombstones are being accumulated in memory. 
> For example if we update a list of 100 items 1000 times, this creates more  than 100,000 tombstones and exceeds the default tombstone_failure_threshold.



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