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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6841) ConcurrentModificationException in commit-log-writer after local schema reset
Date Wed, 12 Mar 2014 15:47:44 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-6841:
--------------------------------------

    Summary: ConcurrentModificationException in commit-log-writer after local schema reset
 (was: ConcurrentModificationException in commit-log-writer after localschemareset)

Can you give more details regarding how you did this?

> ConcurrentModificationException in commit-log-writer after local schema reset
> -----------------------------------------------------------------------------
>
>                 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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