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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [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
Date Thu, 14 Nov 2013 22:07:22 GMT

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

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

    Description: 
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 none-EQUAL clauses, 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.


  was:
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.



> 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 none-EQUAL clauses, 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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