[jira] [Reopened] (CASSANDRA-8399) Reference Counter exception when dropping user type

["Benedict (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-8399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict reopened CASSANDRA-8399:
---------------------------------

I think this simply replaces one bug with another. See CASSANDRA-8513 for what I think is the actual bug. The SSTableScanner does not need to successfully acquire a reference if it is being performed by a normal read, since it will be guarded by an OpOrder. However if it fails to do so it should not release a reference. The change here means that there won't be bad reference counting, but range queries could erroneously return no data.

> 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.



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