[jira] [Updated] (CASSANDRA-6348) TimeoutException throws if Cql query allows data filtering and index is too big and it can't find the data in base CF after filtering

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

     [ https://issues.apache.org/jira/browse/CASSANDRA-6348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Liu updated CASSANDRA-6348:
--------------------------------

    Summary: TimeoutException throws if Cql query allows data filtering and index is too big and it can't find the data in base CF after filtering   (was: TimeoutException throws if Cql query allow data filtering and index is big and can't find the data in base CF after filtering )

> TimeoutException throws if Cql query allows data filtering and index is too big and it can't find the data in base CF after filtering 
> --------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6348
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6348
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Alex Liu
>            Assignee: Alex Liu
>
> If index row is too big, and filtering can't find the match Cql row in base CF, it keep scanning the index row and retrieving base CF until the index row is scanned completely which may take too long and thrift server returns TimeoutException. This is one of the reasons why we shouldn't index a column if the index is too big.
> Multiple indexes merging can resolve the case where there are only EQUAL clauses. (CASSANDRA-6048 addresses it).
> If the query has clauses other than EQUAL, we still need do data filtering which might lead to timeout exception.
> We can either disable those kind of queries or WARN the user that data filtering might lead to timeout exception or OOM.



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