[jira] [Created] (CASSANDRA-9662) compactionManager reporting wrong pendingtasks

["Tony Xu (JIRA)" <ji...@apache.org>]

Tony Xu created CASSANDRA-9662:
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             Summary: compactionManager reporting wrong pendingtasks
                 Key: CASSANDRA-9662
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9662
             Project: Cassandra
          Issue Type: Bug
          Components: API
         Environment: OS: Amazon Linux AMI release 2015.03
Cassandra: 2.0.16
JVM: Java HotSpot(TM) 64-Bit Server VM (25.40-b25, mixed mode)
Java: version 1.8.0_40, vendor Oracle Corporation
CPU: 8 core Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
Memory: 32G

            Reporter: Tony Xu
            Priority: Minor
             Fix For: 2.0.16
         Attachments: node1.jpg

Yesterday I upgraded my Cassandra cluster from 2.0.14 to 2.0.16, after upgrade, I am start seeing some strange behaviours of "PendingTasks" reporting.

The Cassandra repository I am using is datastax, steps I performed for upgrade:

yum update -y cassandra20

The upgrade went fine, after upgrade cluster is operating okay. "nodetool info and nodetool status" results looked fine. "nodetool version" is reporting the correct version.

But our monitoring system start reporting some crazy "pendingtasks". For example, "pending taks" for node1 sometimes jump from 0 to 15K for about 1 minute, then drop back to 0. This issue keeps occurring, didn't have this issue with 2.0.14. Our monitoring system is checking the value of "MBeans" -> "CompactionManager" -> "PendingTasks".



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