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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-2401) getColumnFamily() return null, which is not checked in scan() method, causing Timeout Exception in query
Date Thu, 05 May 2011 15:21:08 GMT


Sylvain Lebresne commented on CASSANDRA-2401:

Comments on the patch:
  * ignoreObsoleteMutation() now forgot to actually remove the obsolete mutation from cf.
  * not sure why mutatedIndexColumns need to be concurrent. There is no concurrency in ignoreObsoleteMutation,
is there ?
  * really minor: change to debug log "Scanning index row %s ..." seems misleading since the
first argument is not a row name.

Other than that, I do agree with you that there is quite probably a race between reads and
concurrent writes. But also agree that it doesn't seem to be the problem here

> getColumnFamily() return null, which is not checked in scan()
method, causing Timeout Exception in query
> -------------------------------------------------------------------------------------------------------------------------------
>                 Key: CASSANDRA-2401
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>         Environment: Hector 0.7.0-28, Cassandra 0.7.4, Windows 7, Eclipse
>            Reporter: Tey Kar Shiang
>            Assignee: Jonathan Ellis
>             Fix For: 0.7.6
>         Attachments: 2401.txt
>, 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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