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Chris Eineke commented on CASSANDRA-5748: ----------------------------------------- Sylvain, Thank you for your response. That's great to hear! Is there a anticipated release date yet? > When flushing, nodes spent almost 100% in AbstractCompositeType.compare > ----------------------------------------------------------------------- > > Key: CASSANDRA-5748 > URL: https://issues.apache.org/jira/browse/CASSANDRA-5748 > Project: Cassandra > Issue Type: Bug > Components: Core > Affects Versions: 1.2.5, 1.2.6 > Environment: Apache Cassandra v1.2.6 > 4-node cluster, mostly the same hardware > # java -version > java version "1.6.0_37" > Java(TM) SE Runtime Environment (build 1.6.0_37-b06) > Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode) > Reporter: Chris Eineke > Priority: Critical > Attachments: thread_dump > > > We're pretty heavy users of CQL3 and CQL3 collection types. Occasionally, > some nodes of the cluster will become extremely sluggish and the cluster as a > whole starts to become unresponsive, reads will time out, and nodes will drop > mutation messages. This happens when nodes flush Memtables to disk (based on > my tail of the system.log on each node). > I'm a curious guy, so I attached jvisualvm (v1.3.3) to the JVMs that were > having this problem. These nodes are spending up to 98% of CPU in > org.apache.cassandra.db.marshal.AbstractCompositeType.compare(AbstractCompositeType.java:78). > I will attach a thread dump. > Thi is causing us quite a headache, because we're unable to figure what would > be causing this. We tried tuning several configuration settings (column cache > size, row key cache size), but the cluster exhibits the same issues even with > the default configuration (except for a modified num_tokens and > listen_address). -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira