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From "Benedict (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8399) Reference Counter exception when dropping user type
Date Mon, 29 Dec 2014 18:48:13 GMT


Benedict commented on CASSANDRA-8399:

This sounds like it would benefit from the formalisation I proposed before then: an SSTableScanner
must exist wholly within the lifetime of a protected operation. This _should_ already be the
case. Scanning the dialogue on CASSANDRA-8019 I'm still not sure why this is occurring, since
the CompactionTask should have taken an extra reference to the sstable it is obsoleting which
 doesn't get decremented until the entire compaction task completes (after the scanner is
closed). So we should find out why this is occurring, since _that_ sounds like the real underlying
bug on that front.

> Reference Counter exception when dropping user type
> ---------------------------------------------------
>                 Key: CASSANDRA-8399
>                 URL:
>             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 {{}}
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 - 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
>         at
>         at org.apache.cassandra.utils.MergeIterator.close( ~[main/:na]
>         at org.apache.cassandra.db.ColumnFamilyStore$8.close(
>         at org.apache.cassandra.db.ColumnFamilyStore.filter(
>         at org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(
>         at org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(
>         at org.apache.cassandra.db.SystemKeyspace.serializedSchema(
>         at org.apache.cassandra.db.SystemKeyspace.serializedSchema(
>         at org.apache.cassandra.config.Schema.updateVersion( ~[main/:na]
>         at org.apache.cassandra.config.Schema.updateVersionAndAnnounce(
>         at org.apache.cassandra.db.DefsTables.mergeSchema( ~[main/:na]
>         at org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(
>         at ~[main/:na]
>         at java.util.concurrent.Executors$ ~[na:1.7.0_67]
>         at ~[na:1.7.0_67]
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(
>         at java.util.concurrent.ThreadPoolExecutor$
>         at [na:1.7.0_67]{code}
> Log of the node with the error is attached.

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