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https://issues.apache.org/jira/browse/CASSANDRA-8399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260306#comment-14260306
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Joshua McKenzie commented on CASSANDRA-8399:
--------------------------------------------
SSTableScanner contains a handle to the ifile and dfile that it pulls from
within the SSTR, so if we decrement the counter on the SSTR and go to tidy it
up while a scanner still has those files open, we get the "Unable to delete"
errors on Windows when we attempt to delete those files. This is largely
resolved by the nio changes unless we memory-map in which case we're right back
to needing to enforce strict ordering (i.e. don't try to delete if anyone has a
handle open / memory mapped segment).
> 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: 8399_fix_empty_results.txt, 8399_v2.txt, 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.
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