I am using 1.2.3, used default heap - 2 GB without JNA installed, then modified heap to 4 GB / 400 MB young generation. + JNA installed. bloom filter on the CF's is lowered (more false positives, less disk space).
WARN [ScheduledTasks:1] 2013-04-11 11:09:41,899 GCInspector.java (line 142) Heap is 0.9885574036095974 full. You may need to reduce memtable and/or cache sizes. Cassandra will now flush up to the two largest memtables to free up memory. Adjust flush_largest_memtables_at threshold in cassandra.yaml if you don't want Cassandra to do this automatically WARN [ScheduledTasks:1] 2013-04-11 11:09:41,906 StorageService.java (line 3541) Flushing CFS(Keyspace='CRAWLER', ColumnFamily='counters') to relieve memory pressure INFO [ScheduledTasks:1] 2013-04-11 11:09:41,949 ColumnFamilyStore.java (line 637) Enqueuing flush of Memtable-counters@862481781(711504/6211531 serialized/live bytes, 11810 ops) ERROR [Thrift:641] 2013-04-11 11:25:19,563 CassandraDaemon.java (line 164) Exception in thread Thread[Thrift:641,5,main] java.lang.OutOfMemoryError: *Java heap space* On Thu, Apr 11, 2013 at 11:26 PM, aaron morton <aa...@thelastpickle.com>wrote: > > The data will be huge, I am estimating 4-6 TB per server. I know this is > best, but those are my resources. > You will have a very unhappy time. > > The general rule of thumb / guideline for a HDD based system with 1G > networking is 300GB to 500Gb per node. See previous discussions on this > topic for reasons. > > > ERROR [Thrift:641] 2013-04-11 11:25:19,563 CassandraDaemon.java (line > 164) Exception in thread Thread[Thrift:641,5,main] > > ... > > INFO [StorageServiceShutdownHook] 2013-04-11 11:25:39,915 > ThriftServer.java (line 116) Stop listening to thrift clients > What was the error ? > > What version are you using? > If you have changed any defaults for memory in cassandra-env.sh or > cassandra.yaml revert them. Generally C* will do the right thing and not > OOM, unless you are trying to store a lot of data on a node that does not > have enough memory. See this thread for background > http://www.mail-archive.com/user@cassandra.apache.org/msg25762.html > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 12/04/2013, at 7:35 AM, Nikolay Mihaylov <n...@nmmm.nu> wrote: > > > For one project I will need to run cassandra on following dedicated > servers: > > > > Single CPU XEON 4 cores no hyper-threading, 8 GB RAM, 12 TB locally > attached HDD's in some kind of RAID, visible as single HDD. > > > > I can do cluster of 20-30 such servers, may be even more. > > > > The data will be huge, I am estimating 4-6 TB per server. I know this is > best, but those are my resources. > > > > Currently I am testing with one of such servers, except HDD is 300 GB. > Every 15-20 hours, I get out of heap memory, e.g. something like: > > > > ERROR [Thrift:641] 2013-04-11 11:25:19,563 CassandraDaemon.java (line > 164) Exception in thread Thread[Thrift:641,5,main] > > ... > > INFO [StorageServiceShutdownHook] 2013-04-11 11:25:39,915 > ThriftServer.java (line 116) Stop listening to thrift clients > > INFO [StorageServiceShutdownHook] 2013-04-11 11:25:39,943 Gossiper.java > (line 1077) Announcing shutdown > > INFO [StorageServiceShutdownHook] 2013-04-11 11:26:08,613 > MessagingService.java (line 682) Waiting for messaging service to quiesce > > INFO [ACCEPT-/208.94.232.37] 2013-04-11 11:26:08,655 > MessagingService.java (line 888) MessagingService shutting down server > thread. > > ERROR [Thrift:721] 2013-04-11 11:26:37,709 CustomTThreadPoolServer.java > (line 217) Error occurred during processing of message. > > java.util.concurrent.RejectedExecutionException: ThreadPoolExecutor has > shut down > > > > Anyone have some advices about better utilization of such servers? > > > > Nick. > >
