[ACCUMULO-2425] ConcurrentModificationException in master at startup

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.1
• Fix Version/s: 1.5.2, 1.6.0
• Component/s: master
• Assignee: John Vines
• Reporter: John Vines
• Created: 03/Mar/14 21:41
• Updated: 11/Mar/14 11:55
• Resolved: 06/Mar/14 21:24

Description

I had brought down my accumulo services hard, immediately ran start-here to bring them up again and the master didn't seem to start. Checked the logs and I had

2014-03-03 16:38:05,336 [master.Master] ERROR: Unexpected exception, exiting
java.util.ConcurrentModificationException
        at java.util.Hashtable$Enumerator.next(Hashtable.java:1048)
        at org.apache.commons.configuration.AbstractConfiguration.append(AbstractConfiguration.java:1239)
        at org.apache.accumulo.core.conf.Property.getDefaultValue(Property.java:401)
        at org.apache.accumulo.core.conf.DefaultConfiguration.iterator(DefaultConfiguration.java:54)
        at org.apache.accumulo.core.conf.SiteConfiguration.iterator(SiteConfiguration.java:77)
        at org.apache.accumulo.server.conf.ZooConfiguration.iterator(ZooConfiguration.java:127)
        at org.apache.accumulo.server.Accumulo.init(Accumulo.java:125)
        at org.apache.accumulo.server.master.Master.main(Master.java:2303)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:622)
        at org.apache.accumulo.start.Main$1.run(Main.java:103)
        at java.lang.Thread.run(Thread.java:701)

sitting there, and then it seems the master died. Started it up again and it was fine.

Issue Links

• is broken by: ACCUMULO-1440 Configuration documentation generation (docs/config.html) should not interpolate properties
• is broken by: ACCUMULO-2334 Lacking fallback when ACCUMULO_LOG_HOST isn't set
• is related to: CONFIGURATION-570 Passing SystemConfiguration() into PropertiesConfiguration() can cause a ConcurrentModificationException