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From "Roland Gude (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2401) getColumnFamily() return null, which is not checked in ColumnFamilyStore.java scan() method, causing Timeout Exception in query
Date Tue, 19 Apr 2011 13:38:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021583#comment-13021583
] 

Roland Gude commented on CASSANDRA-2401:
----------------------------------------

i just looked a little closer at your index expressions again.
If i understand them correctly they are subject to https://issues.apache.org/jira/browse/CASSANDRA-2347
Although i don't really think it is the issue you are describing it would be nice if you could
apply the patch and see if the error still occurs.

You are creating the bytebuffers for author_id and file_type in a different way. Is this a
mistake? 

> getColumnFamily() return null, which is not checked in ColumnFamilyStore.java scan()
method, causing Timeout Exception in query
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2401
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2401
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.4
>         Environment: Hector 0.7.0-28, Cassandra 0.7.4, Windows 7, Eclipse
>            Reporter: Tey Kar Shiang
>
> ColumnFamilyStore.java, line near 1680, "ColumnFamily data = getColumnFamily(new QueryFilter(dk,
path, firstFilter))", the data is returned null, causing NULL exception in "satisfies(data,
clause, primary)" which is not captured. The callback got timeout and return a Timeout exception
to Hector.
> The data is empty, as I traced, I have the the columns Count as 0 in removeDeletedCF(),
which return the null there. (I am new and trying to understand the logics around still).
Instead of crash to NULL, could we bypass the data?
> About my test:
> A stress-test program to add, modify and delete data to keyspace. I have 30 threads simulate
concurrent users to perform the actions above, and do a query to all rows periodically. I
have Column Family with rows (as File) and columns as index (e.g. userID, fileType).
> No issue on the first day of test, and stopped for 3 days. I restart the test on 4th
day, 1 of the users failed to query the files (timeout exception received). Most of the users
are still okay with the query.

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