[ https://issues.apache.org/jira/browse/CASSANDRA-5767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis resolved CASSANDRA-5767. --------------------------------------- Resolution: Cannot Reproduce > NPE under load > -------------- > > Key: CASSANDRA-5767 > URL: https://issues.apache.org/jira/browse/CASSANDRA-5767 > Project: Cassandra > Issue Type: Bug > Components: Core > Affects Versions: 1.2.6 > Reporter: Nikolai Grigoriev > > I am new to Cassandra so my report may not contain enough relevant > information. I am trying to use Cassandra as backend storage for Titan graph > DB. I am running a simple test on a small cluster of 4 Cassandra nodes (1.2.6 > all of them, running from scratch). I can consistently get this exception > that makes Cassandra unusable: > {code} > INFO [FlushWriter:38] 2013-07-16 23:28:37,246 Memtable.java (line 461) > Writing Memtable-schema_columnfamilies@1756904544(1291/1291 serialized/live > bytes, 21 ops) > INFO [FlushWriter:38] 2013-07-16 23:28:37,395 Memtable.java (line 495) > Completed flushing > /hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnf > amilies-ic-284-Data.db (701 bytes) for commitlog position > ReplayPosition(segmentId=1374015168706, position=2927400) > INFO [CompactionExecutor:188] 2013-07-16 23:28:37,396 CompactionTask.java > (line 105) Compacting > [SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfam > ilies/system-schema_columnfamilies-ic-281-Data.db'), > SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-284-Dat > a.db'), > SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-283-Data.db'), > SSTableReader(path='/hadoop/disk4/cas > sandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-282-Data.db')] > ERROR [MigrationStage:1] 2013-07-16 23:28:37,405 CassandraDaemon.java (line > 192) Exception in thread Thread[MigrationStage:1,5,main] > java.lang.NullPointerException > at > org.apache.cassandra.db.DefsTable.mergeColumnFamilies(DefsTable.java:476) > at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:355) > at > org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:55) > at > org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) > 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) > INFO [CompactionExecutor:188] 2013-07-16 23:28:37,580 CompactionTask.java > (line 262) Compacted 4 sstables to > [/hadoop/disk4/cassandra/data/system/schema_columnfamilies/s > ystem-schema_columnfamilies-ic-285,]. 7,059 bytes to 5,801 (~82% of > original) in 184ms = 0.030067MB/s. 8 total rows, 5 unique. Row merge counts > were {1:4, 2:0, 3:0, 4: > 1, } > INFO [MigrationStage:1] 2013-07-16 23:28:42,595 ColumnFamilyStore.java (line > 630) Enqueuing flush of Memtable-schema_columnfamilies@1684657235(1207/1207 > serialized/live > bytes, 21 ops) > INFO [FlushWriter:39] 2013-07-16 23:28:42,596 Memtable.java (line 461) > Writing Memtable-schema_columnfamilies@1684657235(1207/1207 serialized/live > bytes, 21 ops) > INFO [FlushWriter:39] 2013-07-16 23:28:42,787 Memtable.java (line 495) > Completed flushing > /hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnf > amilies-ic-286-Data.db (699 bytes) for commitlog position > ReplayPosition(segmentId=1374015168706, position=2929541) > ERROR [MigrationStage:1] 2013-07-16 23:28:42,796 CassandraDaemon.java (line > 192) Exception in thread Thread[MigrationStage:1,5,main] > java.lang.NullPointerException > at > org.apache.cassandra.db.DefsTable.mergeColumnFamilies(DefsTable.java:476) > at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:355) > at > org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:55) > at > org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) > 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) > INFO [MemoryMeter:1] 2013-07-16 23:28:58,908 Memtable.java (line 238) > CFS(Keyspace='mykeyspace', ColumnFamily='edgestore') liveRatio is > 9.582214511662903 (just-counted w > as 9.582214511662903). calculation took 136930ms for 18075721 columns > INFO [MemoryMeter:1] 2013-07-16 23:29:14,208 Memtable.java (line 238) > CFS(Keyspace='mykeyspace', ColumnFamily='vertexindex') liveRatio is > 36.198425299625 (just-counted w > as 36.198425299625). calculation took 15300ms for 720565 columns > {code} -- This message is automatically generated by JIRA. 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