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From "Sylvain Lebresne (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 Thu, 12 May 2011 17:54:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032542#comment-13032542
] 

Sylvain Lebresne commented on CASSANDRA-2401:
---------------------------------------------

>From irc:
{noformat}
pcmanus : jbellis: do you know what's up with #2401 ?
jbellis : jackson can't reproduce anymore either, but he wants to test more before calling
it fixed
{noformat}
So I'm going to mark this resolved as this fixed a legit bug and I don't want to push it 0.7.7.
If there is still related problems, let's open another ticket.

> 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
>          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-v2.txt, 2401-v3.txt, 2401.txt
>
>
> 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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