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https://issues.apache.org/jira/browse/CASSANDRA-13785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16140977#comment-16140977
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Jay Zhuang commented on CASSANDRA-13785:
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[~rha] that makes sense. I updated the patch to define the magic number.
Basically, the number is coming from here:
[IndexSummaryBuilder.java:112|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/IndexSummaryBuilder.java#L112]
We potentially could support more entries if the partition key size is smaller
than {{32}}, but I think it's still good to increase the
{{[effectiveMinInterval|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/IndexSummaryBuilder.java#L96]}}
to reduce the summary size automatically in that case.
Also the "large number of keys" more likely have larger partition key size
(like {{32}} or even larger).
| branch | dTest |
| [13785-3.0|https://github.com/cooldoger/cassandra/tree/13785-3.0] |
[!https://circleci.com/gh/cooldoger/cassandra/tree/13785-3.0.svg?style=svg!|https://circleci.com/gh/cooldoger/cassandra/tree/13785-3.0]
|
| [13785-3.11|https://github.com/cooldoger/cassandra/tree/13785-3.11] |
[!https://circleci.com/gh/cooldoger/cassandra/tree/13785-3.11.svg?style=svg!|https://circleci.com/gh/cooldoger/cassandra/tree/13785-3.11]
|
| [13785-trunk|https://github.com/cooldoger/cassandra/tree/13785-trunk] |
[!https://circleci.com/gh/cooldoger/cassandra/tree/13785-trunk.svg?style=svg!|https://circleci.com/gh/cooldoger/cassandra/tree/13785-trunk]
|
> 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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