I think 512 is fine. Could you tell more about your traffic characteristics?
Cem On Wed, Oct 2, 2013 at 4:32 PM, srmore <comom...@gmail.com> wrote: > I changed my index_interval from 128 to index_interval: 128 to 512, does > it make sense to increase more than this ? > > > On Wed, Oct 2, 2013 at 9:30 AM, cem <cayiro...@gmail.com> wrote: > >> Have a look to index_interval. >> >> Cem. >> >> >> On Wed, Oct 2, 2013 at 2:25 PM, srmore <comom...@gmail.com> wrote: >> >>> The version of Cassandra I am using is 1.0.11, we are migrating to 1.2.X >>> though. We had tuned bloom filters (0.1) and AFAIK making it lower than >>> this won't matter. >>> >>> Thanks ! >>> >>> >>> On Tue, Oct 1, 2013 at 11:54 PM, Mohit Anchlia >>> <mohitanch...@gmail.com>wrote: >>> >>>> Which Cassandra version are you on? Essentially heap size is function >>>> of number of keys/metadata. In Cassandra 1.2 lot of the metadata like bloom >>>> filters were moved off heap. >>>> >>>> >>>> On Tue, Oct 1, 2013 at 9:34 PM, srmore <comom...@gmail.com> wrote: >>>> >>>>> Does anyone know what would roughly be the heap size for cassandra >>>>> with 1TB of data ? We started with about 200 G and now on one of the nodes >>>>> we are already on 1 TB. We were using 8G of heap and that served us well >>>>> up >>>>> until we reached 700 G where we started seeing failures and nodes >>>>> flipping. >>>>> >>>>> With 1 TB of data the node refuses to come back due to lack of memory. >>>>> needless to say repairs and compactions takes a lot of time. We upped the >>>>> heap from 8 G to 12 G and suddenly everything started moving rapidly i.e. >>>>> the repair tasks and the compaction tasks. But soon (in about 9-10 hrs) we >>>>> started seeing the same symptoms as we were seeing with 8 G. >>>>> >>>>> So my question is how do I determine what is the optimal size of heap >>>>> for data around 1 TB ? >>>>> >>>>> Following are some of my JVM settings >>>>> >>>>> -Xms8G >>>>> -Xmx8G >>>>> -Xmn800m >>>>> -XX:NewSize=1200M >>>>> XX:MaxTenuringThreshold=2 >>>>> -XX:SurvivorRatio=4 >>>>> >>>>> Thanks ! >>>>> >>>> >>>> >>> >> >
