[CASSANDRA-8332] Null pointer after droping keyspace

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 2.0.12, 2.1.3
• Component/s: Legacy/Distributed Metadata
• Severity: Low
• Assignee: T Jake Luciani
• Reporter: Chris Lohfink

Authors

T Jake Luciani

Reviewers

Chris Lohfink

• Created: 18/Nov/14 04:03
• Updated: 16/Apr/19 09:31
• Resolved: 12/Dec/14 14:15

Description

After dropping keyspace, sometimes I see this in logs:

ERROR 03:40:29 Exception in thread Thread[CompactionExecutor:2,1,main]
java.lang.AssertionError: null
	at org.apache.cassandra.io.compress.CompressionParameters.setLiveMetadata(CompressionParameters.java:108) ~[main/:na]
	at org.apache.cassandra.io.sstable.SSTableReader.getCompressionMetadata(SSTableReader.java:1142) ~[main/:na]
	at org.apache.cassandra.io.sstable.SSTableReader.openDataReader(SSTableReader.java:1896) ~[main/:na]
	at org.apache.cassandra.io.sstable.SSTableScanner.<init>(SSTableScanner.java:68) ~[main/:na]
	at org.apache.cassandra.io.sstable.SSTableReader.getScanner(SSTableReader.java:1681) ~[main/:na]
	at org.apache.cassandra.io.sstable.SSTableReader.getScanner(SSTableReader.java:1693) ~[main/:na]
	at org.apache.cassandra.db.compaction.LeveledCompactionStrategy.getScanners(LeveledCompactionStrategy.java:181) ~[main/:na]
	at org.apache.cassandra.db.compaction.WrappingCompactionStrategy.getScanners(WrappingCompactionStrategy.java:320) ~[main/:na]
	at org.apache.cassandra.db.compaction.AbstractCompactionStrategy.getScanners(AbstractCompactionStrategy.java:340) ~[main/:na]
	at org.apache.cassandra.db.compaction.CompactionTask.runWith(CompactionTask.java:151) ~[main/:na]
	at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48) ~[main/:na]
	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[main/:na]
	at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:75) ~[main/:na]
	at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59) ~[main/:na]
	at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:233) ~[main/:na]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_71]
	at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_71]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_71]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_71]
	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_71]

Minor issue since doesn't really affect anything, but the error makes it look like somethings wrong. Seen on 2.1 branch (1b21aef8152d96a180e75f2fcc5afad9ded6c595), not sure how far back (may be post 2.1.2).