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Posted to commits@cassandra.apache.org by "Jay Zhuang (JIRA)" <ji...@apache.org> on 2017/08/29 21:14:00 UTC
[jira] [Resolved] (CASSANDRA-13785) Compaction fails for SSTables
with large number of keys
[ https://issues.apache.org/jira/browse/CASSANDRA-13785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jay Zhuang resolved CASSANDRA-13785.
------------------------------------
Resolution: Duplicate
> Compaction fails for SSTables with large number of keys
> -------------------------------------------------------
>
> Key: CASSANDRA-13785
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13785
> Project: Cassandra
> Issue Type: Bug
> Components: Compaction
> Reporter: Jay Zhuang
> Assignee: Jay Zhuang
>
> Every a few minutes there're "LEAK DTECTED" messages in the log:
> {noformat}
> ERROR [Reference-Reaper:1] 2017-08-18 17:18:40,357 Ref.java:223 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@3ed22d7) to class org.apache.cassandra.utils.concurrent.WrappedSharedCloseable$Tidy@1022568824:[Memory@[0..159b6ba4), Memory@[0..d8123468)] was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2017-08-18 17:20:49,693 Ref.java:223 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@6470405b) to class org.apache.cassandra.utils.concurrent.WrappedSharedCloseable$Tidy@97898152:[Memory@[0..159b6ba4), Memory@[0..d8123468)] was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2017-08-18 17:22:38,519 Ref.java:223 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@6fc4af5f) to class org.apache.cassandra.utils.concurrent.WrappedSharedCloseable$Tidy@1247404854:[Memory@[0..159b6ba4), Memory@[0..d8123468)] was not released before the reference was garbage collected
> {noformat}
> Debugged the issue and found it's triggered by failed compactions, if the compacted SSTable has more than 51m {{Integer.MAX_VALUE / 40}}) keys, it will fail to create the IndexSummary: [IndexSummary:84|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/io/sstable/IndexSummary.java#L84].
> Cassandra compaction tried to compact every a few minutes and keeps failing.
> The root cause is while [creating SafeMemoryWriter|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/io/sstable/IndexSummaryBuilder.java#L112] with {{> Integer.MAX_VALUE}} space, it returns the tailing {{Integer.MAX_VALUE}} space [SafeMemoryWriter.java:83|https://github.com/apache/cassandra/blob/6a1b1f26b7174e8c9bf86a96514ab626ce2a4117/src/java/org/apache/cassandra/io/util/SafeMemoryWriter.java#L83], which makes the first [entries.length()|https://github.com/apache/cassandra/blob/6a1b1f26b7174e8c9bf86a96514ab626ce2a4117/src/java/org/apache/cassandra/io/sstable/IndexSummaryBuilder.java#L173] not 0. So the assert fails here: [IndexSummary:84|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/io/sstable/IndexSummary.java#L84]
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