Pas created CASSANDRA-6841:
------------------------------
Summary: ConcurrentModificationException in commit-log-writer
after localschemareset
Key: CASSANDRA-6841
URL: https://issues.apache.org/jira/browse/CASSANDRA-6841
Project: Cassandra
Issue Type: Bug
Environment: Linux 3.2.0 (Debian Wheezy) Cassandra 2.0.6, Oracle JVM
1.7.0_51
Almost default cassandra.yaml (IPs and cluster name changed)
This is the 2nd node in a 2-node ring. It has ~2500 keyspaces and very low
traffic. (Only new keyspaces see reads and writes.)
Reporter: Pas
Priority: Minor
{code}
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,013
MigrationManager.java (line 329) Starting local schema reset...
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,016
ColumnFamilyStore.java (line 785) Enqueuing flush of
Memtable-local@394448776(114/1140 serialized/live bytes, 3 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,016 Memtable.java (line 331) Writing
Memtable-local@394448776(114/1140 serialized/live bytes, 3 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,182 Memtable.java (line 371)
Completed flushing
/var/lib/cassandra/data/system/local/system-local-jb-398-Data.db (145 bytes)
for commitlog position ReplayPosition(segmentId=1394620057452,
position=33159822)
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,185
ColumnFamilyStore.java (line 785) Enqueuing flush of
Memtable-local@1087210140(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,185 Memtable.java (line 331) Writing
Memtable-local@1087210140(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,357 Memtable.java (line 371)
Completed flushing
/var/lib/cassandra/data/system/local/system-local-jb-399-Data.db (96 bytes) for
commitlog position ReplayPosition(segmentId=1394620057452, position=33159959)
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,361
ColumnFamilyStore.java (line 785) Enqueuing flush of
Memtable-local@768887091(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,361 Memtable.java (line 331) Writing
Memtable-local@768887091(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,516 Memtable.java (line 371)
Completed flushing
/var/lib/cassandra/data/system/local/system-local-jb-400-Data.db (96 bytes) for
commitlog position ReplayPosition(segmentId=1394620057452, position=33160096)
INFO [CompactionExecutor:38] 2014-03-12 11:37:54,517 CompactionTask.java (line
115) Compacting
[SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-398-Data.db'),
SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-400-Data.db'),
SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-399-Data.db'),
SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-397-Data.db')]
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,519
ColumnFamilyStore.java (line 785) Enqueuing flush of
Memtable-local@271993477(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,519 Memtable.java (line 331) Writing
Memtable-local@271993477(62/620 serialized/live bytes, 1 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:54,794 Memtable.java (line 371)
Completed flushing
/var/lib/cassandra/data/system/local/system-local-jb-401-Data.db (96 bytes) for
commitlog position ReplayPosition(segmentId=1394620057452, position=33160233)
INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,799
MigrationManager.java (line 357) Local schema reset is complete.
INFO [CompactionExecutor:38] 2014-03-12 11:37:54,848 CompactionTask.java (line
275) Compacted 4 sstables to
[/var/lib/cassandra/data/system/local/system-local-jb-402,]. 6,099 bytes to
5,821 (~95% of original) in 330ms = 0.016822MB/s. 4 total partitions merged to
1. Partition merge counts were {4:1, }
INFO [OptionalTasks:1] 2014-03-12 11:37:55,110 ColumnFamilyStore.java (line
785) Enqueuing flush of Memtable-schema_columnfamilies@106276050(181506/509164
serialized/live bytes, 3276 ops)
INFO [FlushWriter:6] 2014-03-12 11:37:55,110 Memtable.java (line 331) Writing
Memtable-schema_columnfamilies@106276050(181506/509164 serialized/live bytes,
3276 ops)
INFO [OptionalTasks:1] 2014-03-12 11:37:55,110 ColumnFamilyStore.java (line
785) Enqueuing flush of Memtable-schema_columns@252242773(185191/630698
serialized/live bytes, 3614 ops)
ERROR [COMMIT-LOG-WRITER] 2014-03-12 11:37:55,111 CassandraDaemon.java (line
196) Exception in thread Thread[COMMIT-LOG-WRITER,5,main]
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
at java.util.HashMap$KeyIterator.next(HashMap.java:960)
at
org.apache.cassandra.db.commitlog.CommitLogAllocator.flushOldestKeyspaces(CommitLogAllocator.java:309)
at
org.apache.cassandra.db.commitlog.CommitLogAllocator.fetchSegment(CommitLogAllocator.java:147)
at
org.apache.cassandra.db.commitlog.CommitLog.activateNextSegment(CommitLog.java:299)
at
org.apache.cassandra.db.commitlog.CommitLog.access$100(CommitLog.java:49)
at
org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:350)
at
org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:51)
at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
at java.lang.Thread.run(Thread.java:744)
{code}
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