Please list down your jvm switches for hbase On Wednesday, August 7, 2013, Vimal Jain wrote:
> Hi Ted, > I am using centOS. > I could not get output of "ps aux | grep pid" as currently the hbase/hadoop > is down in production due to some internal reasons. > > Can you please help me in figuring out memory distribution for my single > node cluster ( pseudo-distributed mode) ? > Currently its just 4GB RAM .Also i can try and make it up to 6 GB. > So i have come up with following distribution :- > > Name node - 512 MB > Data node - 1024MB > Secondary Name node - 512 MB > > HMaster - 512 MB > HRegion - 2048 MB > Zookeeper - 512 MB > > So total memory allocation is 5 GB and i still have 1 GB left for OS. > > 1) So is it fine to go ahead with this configuration in production ? ( I > am asking this because i had "long GC pause" problems in past when i did > not change JVM memory allocation configuration in hbase-env.sh and > hadoop-env.sh so it was taking default values . i.e. 1 GB for each of the 6 > process so total allocation was 6 GB and i had only 4 GB of RAM. After this > i just assigned 1.5 GB to HRegion and 512 MB each to HMaster and Zookeeper > . I forgot to change it for Hadoop processes.Also i changed kernel > parameter vm.swappiness to 0. After this , it was working fine). > > 2) Currently i am running pseudo-distributed mode as my data size is at max > 10-15GB at present.How easy it is to migrate from pseudo-distributed mode > to Fully distributed mode in future if my data size increases ? ( which > will be the case for sure ) . > > Thanks for your help . Really appreciate it . > > > > > On Sun, Aug 4, 2013 at 8:12 PM, Kevin O'dell > <[email protected]<javascript:;> > >wrote: > > > My questions are : > > 1) How this thing is working ? It is working because java can over > allocate > > memory. You will know you are using too much memory when the kernel > starts > > killing processes. > > 2) I just have one table whose size at present is about 10-15 GB , so > what > > should be ideal memory distribution ? Really you should get a box with > more > > memory. You can currently only hold about ~400 MB in memory. > > On Aug 4, 2013 9:58 AM, "Ted Yu" <[email protected] <javascript:;>> > wrote: > > > > > What OS are you using ? > > > > > > What is the output from the following command ? > > > ps aux | grep pid > > > where pid is the process Id for Namenode, Datanode, etc. > > > > > > Cheers > > > > > > On Sun, Aug 4, 2013 at 6:33 AM, Vimal Jain > > > <[email protected]<javascript:;>> > wrote: > > > > > > > Hi, > > > > I have configured Hbase in pseudo distributed mode with HDFS as > > > underlying > > > > storage.I am not using map reduce framework as of now > > > > I have 4GB RAM. > > > > Currently i have following distribution of memory > > > > > > > > Data Node,Name Node,Secondary Name Node each :1000MB(default > > > > HADOOP_HEAPSIZE > > > > property) > > > > > > > > Hmaster - 512 MB > > > > HRegion - 1536 MB > > > > Zookeeper - 512 MB > > > > > > > > So total heap allocation becomes - 5.5 GB which is absurd as my total > > RAM > > > > is only 4 GB , but still the setup is working fine on production. :-0 > > > > > > > > My questions are : > > > > 1) How this thing is working ? > > > > 2) I just have one table whose size at present is about 10-15 GB , so > > > what > > > > should be ideal memory distribution ? > > > > -- > > > > Thanks and Regards, > > > > Vimal Jain > > > > > > > > > > > > > -- > Thanks and Regards, > Vimal Jain >
