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https://issues.apache.org/jira/browse/ACCUMULO-2425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13930267#comment-13930267
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Christopher Tubbs commented on ACCUMULO-2425:
---------------------------------------------
{quote}What was going on here when that was written?{quote}
Interpolation was added to *document* the default value only. Originally,
VFS_CLASSLOADER_CACHE_DIR just declared System.getProperty("java.io.tmpdir") as
part of its value, but that screwed up the auto-generated documentation, by
hard-coding the values for the system on which it was built, rather than the
values which would actually be used at runtime. This was just a hack to get the
documentation correct.
{quote}Why do we not want interpolation with user defined settings?{quote}
I think we do, but that hasn't been added yet. I think that's best done by
transitioning the whole configuration to commons-configuration.
> ConcurrentModificationException in master at startup
> ----------------------------------------------------
>
> Key: ACCUMULO-2425
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2425
> Project: Accumulo
> Issue Type: Bug
> Components: master
> Affects Versions: 1.5.1
> Reporter: John Vines
> Assignee: John Vines
> Fix For: 1.5.2, 1.6.0
>
>
> 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
> {code}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)
> {code}
> sitting there, and then it seems the master died. Started it up again and it
> was fine.
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