[
https://issues.apache.org/jira/browse/CASSANDRA-8399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14244765#comment-14244765
]
Joshua McKenzie commented on CASSANDRA-8399:
--------------------------------------------
Capturing the stack on the SSTR ref counting shows 4 getRangeSlice creation and
5 MergeIterator releases in one example however I can't find any mismatches
from reading through the MergeIterator code. Taking that a step further, I
traced the sstable acquire/release calls in the SSTableScanner with an atomic
int count to throw assertion on non-zero count on close() and the call that's
throwing the assertion looks to be correctly paired with an acquire, implying
that the unbalanced release on the SSTR is coming from another source and the
scanner close() assertion is simply exposing it:
I haven't been able to reproduce the assertion w/out the reference counting on
the SSTableScanner.
> Reference Counter exception when dropping user type
> ---------------------------------------------------
>
> Key: CASSANDRA-8399
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8399
> Project: Cassandra
> Issue Type: Bug
> Reporter: Philip Thompson
> Assignee: Joshua McKenzie
> Fix For: 2.1.3
>
> Attachments: node2.log, ubuntu-8399.log
>
>
> When running the dtest
> {{user_types_test.py:TestUserTypes.test_type_keyspace_permission_isolation}}
> with the current 2.1-HEAD code, very frequently, but not always, when
> dropping a type, the following exception is seen:{code}
> ERROR [MigrationStage:1] 2014-12-01 13:54:54,824 CassandraDaemon.java:170 -
> Exception in thread Thread[MigrationStage:1,5,main]
> java.lang.AssertionError: Reference counter -1 for
> /var/folders/v3/z4wf_34n1q506_xjdy49gb780000gn/T/dtest-eW2RXj/test/node2/data/system/schema_keyspaces-b0f2235744583cdb9631c43e59ce3676/system-sche
> ma_keyspaces-ka-14-Data.db
> at
> org.apache.cassandra.io.sstable.SSTableReader.releaseReference(SSTableReader.java:1662)
> ~[main/:na]
> at
> org.apache.cassandra.io.sstable.SSTableScanner.close(SSTableScanner.java:164)
> ~[main/:na]
> at
> org.apache.cassandra.utils.MergeIterator.close(MergeIterator.java:62)
> ~[main/:na]
> at
> org.apache.cassandra.db.ColumnFamilyStore$8.close(ColumnFamilyStore.java:1943)
> ~[main/:na]
> at
> org.apache.cassandra.db.ColumnFamilyStore.filter(ColumnFamilyStore.java:2116)
> ~[main/:na]
> at
> org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(ColumnFamilyStore.java:2029)
> ~[main/:na]
> at
> org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(ColumnFamilyStore.java:1963)
> ~[main/:na]
> at
> org.apache.cassandra.db.SystemKeyspace.serializedSchema(SystemKeyspace.java:744)
> ~[main/:na]
> at
> org.apache.cassandra.db.SystemKeyspace.serializedSchema(SystemKeyspace.java:731)
> ~[main/:na]
> at org.apache.cassandra.config.Schema.updateVersion(Schema.java:374)
> ~[main/:na]
> at
> org.apache.cassandra.config.Schema.updateVersionAndAnnounce(Schema.java:399)
> ~[main/:na]
> at
> org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:167)
> ~[main/:na]
> at
> org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:49)
> ~[main/:na]
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> ~[main/:na]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> ~[na:1.7.0_67]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> ~[na:1.7.0_67]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> ~[na:1.7.0_67]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_67]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]{code}
> Log of the node with the error is attached.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
