[CASSANDRA-4218] NPE thrown after switching to LeveledCompactionStrategy

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Not A Problem

Environment

SunOS corbina.local 5.11 joyent_ i86pc i386 i86pc Solaris

• Severity: Normal
• Assignee: Unassigned
• Reporter: Alex Whittaker
• Created: 03/May/12 21:14
• Updated: 16/Apr/19 09:32
• Resolved: 03/May/12 22:43

Description

After running out of disk space on our six node Cassandra cluster we switched to a Levelled Compaction Strategy. The servers began to degrade performance accruing a large number of pending tasks - we noticed that there was a NullPointerException appearing in the system log:

ERROR [CompactionExecutor:22] 2012-05-03 20:34:38,931 AbstractCassandraDaemon.java (line 139) Fatal exception in thread Thread[CompactionExecutor:22,1,main]
java.lang.NullPointerException
at java.io.File.<init>(File.java:222)
at org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(ColumnFamilyStore.java:642)
at org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(ColumnFamilyStore.java:653)
at org.apache.cassandra.db.ColumnFamilyStore.createCompactionWriter(ColumnFamilyStore.java:1892)
at org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:153)
at org.apache.cassandra.db.compaction.LeveledCompactionTask.execute(LeveledCompactionTask.java:57)
at org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:135)
at org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:115)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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)