Michael Swiecicki created CASSANDRA-8862:
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Summary: Commit log pending tasks incremented during
getPendingTasks
Key: CASSANDRA-8862
URL: https://issues.apache.org/jira/browse/CASSANDRA-8862
Project: Cassandra
Issue Type: Bug
Reporter: Michael Swiecicki
Priority: Minor
After upgrading from Cassandra 2.0.8 to 2.1.2 our monitoring based on JMX
metrics shows increasing number of commit log pending tasks. From what we found
out, this value is now incremented every time it is fetched.
It is easy to reproduce using tool like JConsole by refreshing value of
PendingTasks attribute.
Quick look at the code shows that this behavior was probably introduced in 2.1
with CASSANDRA-3578 where getPendingTasks in AbstractCommitLogService was
changed from returning queue.size() to returning pending.incrementAndGet(). As
a result this counter is incremented when getting value of
Commitlog.PendingTasks from org.apache.cassandra.db (now deprecated) or
CommitLog.PendingTasks from org.apache.cassandra.metrics.
Could you please clarify if this is expected behavior?
This was already mentioned in CASSANDRA-8531.
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