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https://issues.apache.org/jira/browse/CASSANDRA-16119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17193198#comment-17193198
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Caleb Rackliffe commented on CASSANDRA-16119:
---------------------------------------------
CC [~marcuse]
> MockSchema's SSTableReader creation leaks FileHandle and Channel instances
> --------------------------------------------------------------------------
>
> Key: CASSANDRA-16119
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16119
> Project: Cassandra
> Issue Type: Bug
> Components: Test/unit
> Reporter: Caleb Rackliffe
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: 4.0-beta
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {{MockSchema}} creates {{SSTableReader}} instances for testing, but when it
> does, it doesn’t seem to ever close the {{FileHandle}} and {{Channel}}
> instances from which copies are made for the actual readers. ({{FileHandle}}
> itself also internally copies the channel on creation.) This can trigger leak
> detection, although perhaps not reliably, from tests like
> {{AntiCompactionTest}}. A couple well-placed {{try-with-resources}} blocks
> should help us avoid this (and shouldn't risk closing anything too early,
> since the close methods for handles and channels seem only to do reference
> bookkeeping anyway).
> Example:
> {noformat}
> [junit-timeout] ERROR 16:35:47,747 LEAK DETECTED: a reference
> (org.apache.cassandra.utils.concurrent.Ref$State@487c0fdb) to class
> org.apache.cassandra.io.util.FileHandle$Cleanup@2072030898:/var/folders/4d/zfjs7m7s6x5_l93k33r5k6680000gn/T/mocksegmentedfile0tmp
> was not released before the reference was garbage collected
> [junit-timeout] ERROR 16:35:47,747 Allocate trace
> org.apache.cassandra.utils.concurrent.Ref$State@487c0fdb:
> [junit-timeout] Thread[main,5,main]
> [junit-timeout] at java.lang.Thread.getStackTrace(Thread.java:1559)
> [junit-timeout] at
> org.apache.cassandra.utils.concurrent.Ref$Debug.<init>(Ref.java:249)
> [junit-timeout] at
> org.apache.cassandra.utils.concurrent.Ref$State.<init>(Ref.java:179)
> [junit-timeout] at
> org.apache.cassandra.utils.concurrent.Ref.<init>(Ref.java:101)
> [junit-timeout] at
> org.apache.cassandra.utils.concurrent.SharedCloseableImpl.<init>(SharedCloseableImpl.java:30)
> [junit-timeout] at
> org.apache.cassandra.io.util.FileHandle.<init>(FileHandle.java:74)
> [junit-timeout] at
> org.apache.cassandra.io.util.FileHandle.<init>(FileHandle.java:50)
> [junit-timeout] at
> org.apache.cassandra.io.util.FileHandle$Builder.complete(FileHandle.java:389)
> [junit-timeout] at
> org.apache.cassandra.schema.MockSchema.sstable(MockSchema.java:124)
> [junit-timeout] at
> org.apache.cassandra.schema.MockSchema.sstable(MockSchema.java:83)
> {noformat}
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