UTC Warning Message each second in log file

Question

Hi,
i'm running a Oracle NoSQL Store (2.0.23) in a 2 node environment.
In the web admin interface under "logs" i find the message
+"UTC WARNING [rg1-rn2] Exception in ResolveHandlerThread when contacting:rg1-rn2"+
repeating each second.
A more detailled error message can be found in log-file rg1-rn2_0.log, which resides on second node of my store:
[phone]:14:37.703 UTC WARNING [rg1-rn2] Exception in ResolveHandlerThread when contacting:rg1-rn2+
java.lang.NullPointerException
at oracle.kv.impl.util.registry.RegistryUtils.getRequestHandler(RegistryUtils.java:125)
at oracle.kv.impl.api.rgstate.RepNodeState$ReqHandlerRef.resolve(RepNodeState.java:592)
at oracle.kv.impl.api.rgstate.RepNodeState.resolveReqHandlerRef(RepNodeState.java:181)
at oracle.kv.impl.api.rgstate.RepNodeStateUpdateThread$ResolveHandler.run(RepNodeStateUpdateThread.java:395)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
When validating/verifying the store (either by web interface or by CLI), everything seems to be ok.
Output from CLI (strangely no performance information from rg1-rn2, which reports messages above):
kv-> show topology
store=sicstore  numPartitions=300 sequence=307
+dc=[dc1] name=SicDC repFactor=2+
+sn=[sn1] dc=dc1 than-pc:5000 capacity=1 RUNNING+
+[rg1-rn1] RUNNING+
single-op avg latency=0.041355196 ms   multi-op avg latency=1.6138855 ms
+sn=[sn2] dc=dc1 10.74.10.221:5000 capacity=1 RUNNING+
+[rg1-rn2] RUNNING+
No performance info available
+shard=[rg1] num partitions=300+
+[rg1-rn1] sn=sn1+
+[rg1-rn2] sn=sn2+
kv-> topology validate
Validation for the current deployed topology:
No problems
kv->
From web interface:
Verification complete, no violations.
Is the error message resulting from a slight (< 1 sec) difference of time on both nodes? I'm not able
to sync the time on both machines via ntp, as on one of them i do not have rights to modify time
settings (system is only for training purpose).
If so, can i ignore the warning or do i have to expect some side-effects?
Thanks & Regards
Thomas

Answer 1

I'm updating this thread. Thomas and I have had some offline communication regarding the log files and the store. The brief summary is that it's not yet clear why this situation arose but there are some clues:
1. The 2-node store started off with a clock skew problem that caused it to not work at all
2. Thomas fixed the skew and retried the deployment plans keeping the store intact (most people tend to make a new store when this happens)
3. The store became functional but in a state where an internal thread would log a warning every second
The development team is still looking into this.
Note: the fact that Windows 7 was involved is probably not a factor.
Disclaimer: technically Oracle NoSQL Database is not supported on that platform.
Regards,
George