After dig system.log. I notice Every GC for ParNew or GC for CMS will produce
StatusLogger.
But I’m not really sure is GC cause it. Is anyone summary this appearance?
INFO [ScheduledTasks:1] 2015-10-21 20:57:54,568 GCInspector.java (line 116) GC
for ParNew: 1165 ms for 1 collections, 828917844
I just want to know when StatusLogger will happen, find this question:
http://qnalist.com/questions/4783598/help-on-statuslogger-output
but no one reply it. seems this question ask Mar 2014. no one notice then. I
just pull it out, hope someone answer this.
TKS.
qihuang.zheng
原始邮件
发件人:qihuang.z
for ensure after GC , there will print StatusLogger, I found this code in
GCInspector.java:
if (durationPerCollection MIN_DURATION_TPSTATS)
StatusLogger.log();
the defaultMIN_DURATION_TPSTATS=1second. so if GC duration more than 1s, there
will be StatusLogger!
But I check StatusL
Some more observations ::
a)
CAS11 and CAS12 are down, CAS21 and CAS22 up.
If I connect via the driver to the cluster using only CAS21 and CAS22 as
contact-points, even then the exception occurs.
b)
CAS11 down, CAS12 up, CAS21 and CAS22 up.
If I connect via the driver to the cluster using only CA
I will try to trace a read that take > 20msec
.
just HDD.no delete just 60days ttl.value size is small ,max length is 140.
My data like Time Series . date of 90% reads which timestamp < 7days. data
almost just insert ,with a lit update.
Ajay,
So It's the default driver behavior to pin requests to the first data
center it connects to (DCAwareRoundRobin strategy). but let me explain why
this is.
I think you're thinking about data centers in Cassandra as a unit of
failure, and while you can have say a rack fail, as you scale up and
You should probably ask the java driver user list
https://groups.google.com/a/lists.datastax.com/forum/#!forum/java-driver-user
,
However I do have some suggestions (any follow up questions please ask on
the java driver list though):
1. It's optional so you don't have to pass it (
https://
Bingo !!!
Using "LoadBalancingPolicy" did the trick.
Exactly what was needed !!!
Thanks and Regards,
Ajay
On Sun, Oct 25, 2015 at 5:52 PM, Ryan Svihla wrote:
> Ajay,
>
> So It's the default driver behavior to pin requests to the first data
> center it connects to (DCAwareRoundRobin strategy).
As Cassandra default-XX:MaxTenuringThreshold=1, which means:
first time YGC, Eden's live object copy to Survivor(S0), those survivor
object's age counter=1.
Then next time YGC, Eden live object and S0 will copy to S1. and those still
live object from S0 age counter=2 which large than MaxTenuringT
I use nodetool cfstats to see table’s status, and findCompacted partition
maximum bytes: 190G.
Is there anyway to find this largest wide partition row?
[qihuang.zheng@cass047202 cassandra]$ nodetool cfstats forseti.velocity
Keyspace: forseti Read Count: 10470099 Read Latency: 1.3186399419909973
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