[CASSANDRA-9460] NullPointerException Creating Digest

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.1.9, 2.2.1
• Component/s: Legacy/Local Write-Read Paths
• Severity: Normal
• Assignee: T Jake Luciani
• Reporter: Tom Hobbs

Authors

T Jake Luciani

Reviewers

stefania_alborghetti

• Created: 22/May/15 17:58
• Updated: 16/Apr/19 09:31
• Resolved: 25/Aug/15 13:22

Description

In the consistency_test.TestConsistency.short_read_test dtest against cassandra-2.1, the following error occured:

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]

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.

Issue Links

• links to: 2.1 patch