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Posted to commits@cassandra.apache.org by "Alex Liu (JIRA)" <ji...@apache.org> on 2013/11/14 22:57:20 UTC
[jira] [Created] (CASSANDRA-6348) TimeoutException throws if Cql
query allow data filtering and index is big and can't find the data in base
CF after filtering
Alex Liu created CASSANDRA-6348:
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Summary: TimeoutException throws if Cql query allow data filtering and index is big and 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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