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From "Thibaut (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-2228) Race conditions when reinitialisating nodes (OOM + Nullpointer)
Date Wed, 23 Feb 2011 15:52:38 GMT
Race conditions when reinitialisating nodes (OOM + Nullpointer)
---------------------------------------------------------------

                 Key: CASSANDRA-2228
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2228
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.7.2
            Reporter: Thibaut
             Fix For: 0.7.3


I had a corrupt system table which wouldn't compact anymore and I deleted the files and restarted
cassandra and let it take the same token/ip address.

I experienced the same errors when I'm adding a newly installed node under the same token/ip
address before calling repair.

1)
After a few seconds/minutes, I get a OOM error:


 INFO [FlushWriter:1] 2011-02-23 16:40:28,958 Memtable.java (line 164) Completed flushing
/cassandra/data/system/Schema-f-15-Data.db (8037 bytes)
 INFO [MigrationStage:1] 2011-02-23 16:40:28,965 Migration.java (line 133) Applying migration
3e30e76b-1e3f-11e0-8369-5a9c1faed4ae Add keyspace: table_userentriesrep factor:3rep strategy:SimpleStrategy{org.apache.cassandra.config.CFMetaData@58925d9[cfId=1024,tableName=table_userentries,cfName=table_userentries,cfType=Standard,comparator=org.apache.cassandra.db.marshal.BytesType@b44dff0,subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=0.0,gcGraceSeconds=86400,defaultValidator=org.apache.cassandra.db.marshal.BytesType@b44dff0,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=3600,memtableFlushAfterMins=60,memtableThroughputInMb=64,memtableOperationsInMillions=10.0,column_metadata={}],
org.apache.cassandra.config.CFMetaData@11ab7246[cfId=1025,tableName=table_userentries,cfName=table_userentries_meta,cfType=Standard,comparator=org.apache.cassandra.db.marshal.BytesType@b44dff0,subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=0.0,gcGraceSeconds=86400,defaultValidator=org.apache.cassandra.db.marshal.BytesType@b44dff0,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=3600,memtableFlushAfterMins=60,memtableThroughputInMb=64,memtableOperationsInMillions=10.0,column_metadata={}]}
 INFO [MigrationStage:1] 2011-02-23 16:40:28,965 ColumnFamilyStore.java (line 666) switching
in a fresh Memtable for Migrations at CommitLogContext(file='/cassandra/commitlog/CommitLog-1298475572022.log',
position=226075)
 INFO [MigrationStage:1] 2011-02-23 16:40:28,966 ColumnFamilyStore.java (line 977) Enqueuing
flush of Memtable-Migrations@2121008793(12529 bytes, 1 operations)
 INFO [FlushWriter:1] 2011-02-23 16:40:28,966 Memtable.java (line 157) Writing Memtable-Migrations@2121008793(12529
bytes, 1 operations)
 INFO [MigrationStage:1] 2011-02-23 16:40:28,966 ColumnFamilyStore.java (line 666) switching
in a fresh Memtable for Schema at CommitLogContext(file='/cassandra/commitlog/CommitLog-1298475572022.log',
position=226075)
 INFO [MigrationStage:1] 2011-02-23 16:40:28,967 ColumnFamilyStore.java (line 977) Enqueuing
flush of Memtable-Schema@139610466(8370 bytes, 15 operations)
 INFO [ScheduledTasks:1] 2011-02-23 16:40:28,972 StatusLogger.java (line 89) table_sourcedetection.table_sourcedetection
                0,0                 0/0            0/200000
ERROR [FlushWriter:1] 2011-02-23 16:41:01,240 AbstractCassandraDaemon.java (line 114) Fatal
exception in thread Thread[FlushWriter:1,5,main]
java.lang.OutOfMemoryError: Java heap space
        at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39)
        at java.nio.ByteBuffer.allocate(ByteBuffer.java:312)
        at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:126)
        at org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:75)
        at org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:158)
        at org.apache.cassandra.db.Memtable.access$000(Memtable.java:51)
        at org.apache.cassandra.db.Memtable$1.runMayThrow(Memtable.java:176)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)





2) If I restart then, I'm getting an Nullpointer exception. The OOM error will only appear
once.

ERROR [main] 2011-02-23 16:42:32,782 AbstractCassandraDaemon.java (line 333) Exception encountered
during startup.
java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
        at org.apache.cassandra.gms.Gossiper.addLocalApplicationState(Gossiper.java:925)
        at org.apache.cassandra.service.MigrationManager.passiveAnnounce(MigrationManager.java:105)
        at org.apache.cassandra.service.MigrationManager.applyMigrations(MigrationManager.java:161)
        at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:185)
        at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:316)
        at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:79)


Killing and restarting the node multiple times will eventually "fix" these errors.


Steps to reproduce. Remove complete data directory and restart node with same token/ip.



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