[
https://issues.apache.org/jira/browse/CASSANDRA-12978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287068#comment-16287068
]
Jeff Jirsa commented on CASSANDRA-12978:
----------------------------------------
Proposing we close this - {{StreamingHistogram}} has been rewritten in 3.0, and
again in 4.0, it's now thread safe, and this isn't critical enough for a 2.1
patch at this point. Any objections?
> mx4j -> HTTP 500 -> ConcurrentModificationException
> ---------------------------------------------------
>
> Key: CASSANDRA-12978
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12978
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Environment: Debian, Single cluster, 2 data centres, E5-2620 v3,
> 16GB, RAID1 SSD Commit log, RAID10 15k HDD data
> Reporter: Rob Emery
> Priority: Critical
> Fix For: 2.1.6
>
>
> We run some checks from our Monitoring software that rely on mx4j.
> The checks typically grab some xml via HTTP request and parse it. For
> example, CF Stats on 'MyKeySpace' and 'MyColumnFamily' are retrieved
> using:
> http://cassandra001:8081/mbean?template=identity&objectname=org.apache.cassandra.db%3Atype%3DColumnFamilies%2Ckeyspace%3DMyKeySpace%2Ccolumnfamily%3DMyColumnFamily
> The checks run each minute. Periodically they result in a "HTTP 500 internal
> server error". The HTML body returned is empty.
> Experimentally we ran Cassandra in the foreground on one node and reproduced
> the problem. this elicited the following stack trace:
> javax.management.RuntimeMBeanException:
> java.util.ConcurrentModificationException
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:839)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:852)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:651)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)
> at
> mx4j.tools.adaptor.http.MBeanCommandProcessor.createMBeanElement(MBeanCommandProcessor.java:119)
> at
> mx4j.tools.adaptor.http.MBeanCommandProcessor.executeRequest(MBeanCommandProcessor.java:56)
> at
> mx4j.tools.adaptor.http.HttpAdaptor$HttpClient.run(HttpAdaptor.java:980)
> Caused by: java.util.ConcurrentModificationException
> at
> java.util.TreeMap$NavigableSubMap$SubMapIterator.nextEntry(TreeMap.java:1594)
> at
> java.util.TreeMap$NavigableSubMap$SubMapEntryIterator.next(TreeMap.java:1642)
> at
> java.util.TreeMap$NavigableSubMap$SubMapEntryIterator.next(TreeMap.java:1636)
> at java.util.AbstractMap$2$1.next(AbstractMap.java:385)
> at
> org.apache.cassandra.utils.StreamingHistogram.sum(StreamingHistogram.java:160)
> at
> org.apache.cassandra.io.sstable.metadata.StatsMetadata.getDroppableTombstonesBefore(StatsMetadata.java:113)
> at
> org.apache.cassandra.io.sstable.SSTableReader.getDroppableTombstonesBefore(SSTableReader.java:2004)
> at
> org.apache.cassandra.db.DataTracker.getDroppableTombstoneRatio(DataTracker.java:507)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getDroppableTombstoneRatio(ColumnFamilyStore.java:3089)
> at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
> at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
> at
> com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:112)
> at
> com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:46)
> at
> com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
> at
> com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:83)
> at
> com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:206)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647)
> ... 4 more
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
