回复：StatusLogger output help

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

回复：StatusLogger output help

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

Re: Is replication possible with already existing data?

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

StatusLogger output help

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,

Re: Is replication possible with already existing data?

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

Re: terrible read/write latency fluctuation

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.

Re: Is replication possible with already existing data?

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

Re: Cassandra Object Mapper - Dynamically pass keyspace value

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 (

Understanding C* -XX:MaxTenuringThreshold=1

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