[cas-user] Disk write failure

[Tom Poage]

Anyone see this?

Observed (so far) in only one of three nodes. Start of the school year, so systems are busy.

> 2013-10-01 09:20:53,809 ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - <Disk Write of TGT-69920-...-casweb10 failed: >
> 2013-10-01 09:20:54,056 ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - <Disk Write of ST-178255-...-casweb10 failed: >
> 2013-10-01 09:21:19,836 ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - <Disk Write of TGT-69920-...-casweb10 failed: >

Disk writes are overflow of in-memory cache.

Each entry followed by stack trace.

> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
> at java.util.HashMap$EntryIterator.next(HashMap.java:934)
> at java.util.HashMap$EntryIterator.next(HashMap.java:932)
> at java.util.HashMap.writeObject(HashMap.java:1098)
> at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
> at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
> at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
> at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)
> at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)
> at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
...

Thanks!
Tom.
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[Tom Poage]

On 10/01/2013 10:50 AM, Tom Poage wrote:
>> 2013-10-01 09:21:19,836 ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - <Disk Write of TGT-69920-...-casweb10 failed: >

>> java.util.ConcurrentModificationException
>> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
>> at java.util.HashMap$EntryIterator.next(HashMap.java:934)

FWIW

http://forums.terracotta.org/forums/posts/list/7882.page

Near the bottom, theorizes mutating content while serializer is
iterating over the collection.