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https://issues.apache.org/jira/browse/CASSANDRA-2401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029005#comment-13029005
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Jackson Chung commented on CASSANDRA-2401:
------------------------------------------
I have an existing data that was resulting similar NPE before the patch. After
applying the patch, the following observed:
{noformat}
DEBUG [ReadStage:82] 2011-05-04 21:23:27,114 ColumnFamilyStore.java (line 1514)
fetched data row ColumnFamily(inode -deleted at 1304363600008-
[70617468:false:49@1304363600219,])
DEBUG [ReadStage:82] 2011-05-04 21:23:27,114 ColumnFamilyStore.java (line 1532)
row ColumnFamily(inode -deleted at 1304363600008-
[70617468:false:49@1304363600219,]) satisfies all clauses
DEBUG [ReadStage:82] 2011-05-04 21:23:27,115 ColumnFamilyStore.java (line 1514)
fetched data row ColumnFamily(inode [70617468:false:10@1304353355296,])
ERROR [ReadStage:82] 2011-05-04 21:23:27,115 AbstractCassandraDaemon.java (line
112) Fatal exception in thread Thread[ReadStage:82,5,main]
java.lang.AssertionError: No data found for
NamesQueryFilter(columns=java.nio.HeapByteBuffer[pos=12 lim=16 cap=17]) in
DecoratedKey(29842926756667498147838693957802723793,
3134346637326336393966396130336561376538623330316566383561616131):QueryPath(columnFamilyName='inode',
superColumnName='null', columnName='null') (original filter
NamesQueryFilter(columns=java.nio.HeapByteBuffer[pos=12 lim=16 cap=17])) from
expression 73656e74696e656cEQ78
at
org.apache.cassandra.db.ColumnFamilyStore.scan(ColumnFamilyStore.java:1512)
at
org.apache.cassandra.service.IndexScanVerbHandler.doVerb(IndexScanVerbHandler.java:42)
at
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:72)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
{noformat}
was the fix intend to avoid future problem, as such existing problem would need
a workaround solution?
> 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.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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