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https://issues.apache.org/jira/browse/CASSANDRA-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021941#comment-13021941
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Tey Kar Shiang edited comment on CASSANDRA-2401 at 4/20/11 3:53 AM:
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Hi Roland,
The 'mistake' is intended by reusing some Hector API code.
Hector has a Integer Serializer, which will generate 4-byte[] from given
integer. The file_type is a 1-byte array. It is to produce exact effected
client call into a test case, solely running cassandra.
was (Author: karshiang):
Hi Roland,
The 'mistake' is sort of intended as according to Hector API, the way we use it.
Hector has a Integer Serializer, which will generate 4-byte[] from given
integer. The file_type is a 1-byte array, as when i try to duplicated it
without Hector. I just tried duplicate the exact effected client code into a
test case solely running cassandra.
> 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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