HUANG DUICAN created CASSANDRA-14953:
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Summary: Failed to reclaim the memory and too many
MemtableReclaimMemory pending task
Key: CASSANDRA-14953
URL: https://issues.apache.org/jira/browse/CASSANDRA-14953
Project: Cassandra
Issue Type: Bug
Components: Local/Memtable
Environment: version : cassandra 2.1.15
jdk: 8
os:suse
Reporter: HUANG DUICAN
Attachments: cassandra_20190105.zip
We found that Cassandra has a lot of write accumulation in the production
environment, and our business has experienced a lot of write failures.
Through the system.log, it was found that MemtableReclaimMemory was pending at
the beginning, and then a large number of MutationStage stacks appeared at a
certain moment.
Finally, the heap memory is full, the GC time reaches tens of seconds, the node
status is DN through nodetool, but the Cassandra process is still running.We
killed the node and restarted the node, and the above situation disappeared.
Also the number of Active MemtableReclaimMemory threads seems to stay at 1.
!image-2019-01-05-11-23-23-752.png!
a large number of MutationStage stacks appeared at a certain moment.
!image-2019-01-05-11-26-56-546.png!
long GC time:
!image-2019-01-05-11-28-00-371.png!
Why is this happening?
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