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https://issues.apache.org/jira/browse/CASSANDRA-9460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tyler Hobbs updated CASSANDRA-9460:
-----------------------------------
Reviewer: Benjamin Lerer (was: Tyler Hobbs)
Assigning [~blerer] to review.
bq. Do you think we need additional dtests or is consistency_test.py enough?
I think consistency_test.py is probably good enough, but since we know there
can be a problem with race conditions, it might be good to make the test loop a
few times instead of doing a single pass.
> NullPointerException Creating Digest
> ------------------------------------
>
> Key: CASSANDRA-9460
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9460
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Stefania
> Fix For: 2.1.x
>
> Attachments: node2.log
>
>
> In the {{consistency_test.TestConsistency.short_read_test}} dtest against
> cassandra-2.1, the following error occured:
> {noformat}
> ERROR [ReadRepairStage:3] 2015-05-22 16:35:25,034 CassandraDaemon.java:223 -
> Exception in thread Thread[ReadRepairStage:3,5,main]
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.db.ColumnFamily.updateDigest(ColumnFamily.java:390)
> ~[main/:na]
> at org.apache.cassandra.db.ColumnFamily.digest(ColumnFamily.java:383)
> ~[main/:na]
> at
> org.apache.cassandra.service.RowDigestResolver.resolve(RowDigestResolver.java:84)
> ~[main/:na]
> at
> org.apache.cassandra.service.RowDigestResolver.resolve(RowDigestResolver.java:28)
> ~[main/:na]
> at
> org.apache.cassandra.service.ReadCallback$AsyncRepairRunner.run(ReadCallback.java:176)
> ~[main/:na]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> ~[na:1.7.0_80]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> ~[na:1.7.0_80]
> at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_80]
> {noformat}
> From a glance at the code in the stacktrace, it looks like there was a null
> cell in the ColumnFamily that we were creating a digest of. This error is
> probably particular to "short reads".
> Here's the failing test:
> http://cassci.datastax.com/job/cassandra-2.1_dtest/lastCompletedBuild/testReport/consistency_test/TestConsistency/short_read_test/.
> I've attached the logs for the node with the error.
> We saw this issue against 2.1, but the problem may also exist with 2.0 and/or
> 2.2.
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