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https://issues.apache.org/jira/browse/CASSANDRA-13106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Zhou resolved CASSANDRA-13106.
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Resolution: Cannot Reproduce
Hi Benedict,
Sorry for the spam and thanks for the reply. I just thought this was a quick
fix. Closing this ticket as I lost the original stack trace and thus cannot
double confirm the CPU utilization issue was caused by
Predicates.<SSTableReader>alwaysTrue().
> Unnecessary assertion
> ---------------------
>
> Key: CASSANDRA-13106
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13106
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Simon Zhou
> Assignee: Simon Zhou
> Priority: Minor
> Attachments: CASSANDRA-13106.patch
>
>
> We had over 70 thousand sstables and it's slow to bootstrap new node, even
> though the CPU utilization for main thread of Cassandra was nearly 100%. So
> we took a few stack traces and found that the main thread were busy running
> this line in Tracker.java:
> {code}
> assert Iterables.all(removed, remove);
> {code}
> Not exactly sure whether this line causes CPU utilization/bootstrapping
> issue, but this line is redundant because the Predict we pass in is
> Predicates.<SSTableReader>alwaysTrue(), which means the assertion always
> returns true. So I propose to remove that line.
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