Arron, Thanks for your response. I was afraid this is the issue. Can you give me some direction regarding the fine tuning of my VMs, I would like to explore that option some more. Thanks!
*Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Tue, Mar 6, 2012 at 11:58 AM, aaron morton <aa...@thelastpickle.com>wrote: > You do not have enough memory allocated to the JVM and are suffering from > excessive GC as a result. > > There are some tuning things you can try, but 480MB is not enough. 1GB > would be a better start, 2 better than that. > > Consider using https://github.com/pcmanus/ccm for testing multiple > instances on a single server rather than a VM. > > Cheers > > ----------------- > Aaron Morton > Freelance Developer > @aaronmorton > http://www.thelastpickle.com > > On 6/03/2012, at 10:21 PM, Tamar Fraenkel wrote: > > I have some more info, after couple of hours running the problematic node > became again 100% CPU and I had to reboot it, last lines from log show it > did GC: > > INFO [ScheduledTasks:1] 2012-03-06 10:28:00,880 GCInspector.java (line > 122) GC for Copy: 203 ms for 1 collections, 185983456 used; max is 513802240 > INFO [ScheduledTasks:1] 2012-03-06 10:28:50,595 GCInspector.java (line > 122) GC for Copy: 3927 ms for 1 collections, 156572576 used; max is > 513802240 > INFO [ScheduledTasks:1] 2012-03-06 10:28:55,434 StatusLogger.java (line > 50) Pool Name Active Pending Blocked > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,298 StatusLogger.java (line > 65) ReadStage 2 2 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,499 StatusLogger.java (line > 65) RequestResponseStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,500 StatusLogger.java (line > 65) ReadRepairStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,500 StatusLogger.java (line > 65) MutationStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,500 StatusLogger.java (line > 65) ReplicateOnWriteStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,500 StatusLogger.java (line > 65) GossipStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,501 StatusLogger.java (line > 65) AntiEntropyStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,501 StatusLogger.java (line > 65) MigrationStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,501 StatusLogger.java (line > 65) StreamStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,501 StatusLogger.java (line > 65) MemtablePostFlusher 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,502 StatusLogger.java (line > 65) FlushWriter 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,502 StatusLogger.java (line > 65) MiscStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,502 StatusLogger.java (line > 65) InternalResponseStage 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,502 StatusLogger.java (line > 65) HintedHandoff 0 0 0 > INFO [ScheduledTasks:1] 2012-03-06 10:29:03,553 StatusLogger.java (line > 69) CompactionManager n/a 0 > > Thanks, > > *Tamar Fraenkel * > Senior Software Engineer, TOK Media > > <tokLogo.png> > > ta...@tok-media.com > Tel: +972 2 6409736 > Mob: +972 54 8356490 > Fax: +972 2 5612956 > > > > > > On Tue, Mar 6, 2012 at 9:12 AM, Tamar Fraenkel <ta...@tok-media.com>wrote: > >> Works.. >> >> But during the night my setup encountered a problem. >> I have two VMs on my cluster (running on VmWare ESXi). >> Each VM has1GB memory, and two Virtual Disks of 16 GB >> They are running on a small server with 4CPUs (2.66 GHz), and 4 GB memory >> (together with two other VMs) >> I put cassandra data on the second disk of each machine. >> VMs are running Ubuntu 11.10 and cassandra 1.0.7. >> >> I left them running overnight and this morning when I came: >> In one node cassandra was down, and the last thing in the system.log is: >> >> INFO [CompactionExecutor:150] 2012-03-06 00:55:04,821 >> CompactionTask.java (line 113) Compacting >> [SSTableReader(path='/opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1243-Data.db'), >> SSTableReader(path='/opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1245-Data.db'), >> SSTableReader(path='/opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1242-Data.db'), >> SSTableReader(path='/opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1244-Data.db')] >> INFO [CompactionExecutor:150] 2012-03-06 00:55:07,919 >> CompactionTask.java (line 221) Compacted to >> [/opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1246-Data.db,]. >> 32,424,771 to 26,447,685 (~81% of original) bytes for 58,938 keys at >> 8.144165MB/s. Time: 3,097ms. >> >> >> The other node was using all it's CPU and I had to restart it. >> After that, I can see that the last lines in it's system.log are that the >> other node is down... >> >> INFO [FlushWriter:142] 2012-03-06 00:55:02,418 Memtable.java (line 246) >> Writing Memtable-tk_vertical_tag_story_indx@1365852701(1122169/25154556 >> serialized/live bytes, 21173 ops) >> INFO [FlushWriter:142] 2012-03-06 00:55:02,742 Memtable.java (line 283) >> Completed flushing >> /opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-1244-Data.db (2075930 >> bytes) >> INFO [GossipTasks:1] 2012-03-06 08:02:18,584 Gossiper.java (line 818) >> InetAddress /10.0.0.31 is now dead. >> >> How can I trace why that happened? >> Also, I brought cassandra up in both nodes. They both spend long time >> reading commit logs, but now they seem to run. >> Any idea how to debug or improve my setup? >> Thanks, >> Tamar >> >> >> >> *Tamar Fraenkel * >> Senior Software Engineer, TOK Media >> >> <tokLogo.png> >> >> >> ta...@tok-media.com >> Tel: +972 2 6409736 >> Mob: +972 54 8356490 >> Fax: +972 2 5612956 >> >> >> >> >> >> On Mon, Mar 5, 2012 at 7:30 PM, aaron morton <aa...@thelastpickle.com>wrote: >> >>> Create nodes that do not share seeds, and give the clusters different >>> names as a safety measure. >>> >>> Cheers >>> >>> ----------------- >>> Aaron Morton >>> Freelance Developer >>> @aaronmorton >>> http://www.thelastpickle.com >>> >>> On 6/03/2012, at 12:04 AM, Tamar Fraenkel wrote: >>> >>> I want tow separate clusters. >>> *Tamar Fraenkel * >>> Senior Software Engineer, TOK Media >>> >>> <tokLogo.png> >>> >>> >>> ta...@tok-media.com >>> Tel: +972 2 6409736 >>> Mob: +972 54 8356490 >>> Fax: +972 2 5612956 >>> >>> >>> >>> >>> >>> On Mon, Mar 5, 2012 at 12:48 PM, aaron morton >>> <aa...@thelastpickle.com>wrote: >>> >>>> Do you want to create two separate clusters or a single cluster with >>>> two data centres ? >>>> >>>> If it's the later, token selection is discussed here >>>> http://www.datastax.com/docs/1.0/install/cluster_init#token-gen-cassandra >>>> >>>> >>>> Moreover all tokens must be unique (even across datacenters), although >>>> - from pure curiosity - I wonder what is the rationale behind this. >>>> >>>> Otherwise data is not evenly distributed. >>>> >>>> By the way, can someone enlighten me about the first line in the output >>>> of the nodetool. Obviously it contains a token, but nothing else. It seems >>>> like a formatting glitch, but maybe it has a role. >>>> >>>> It's the exclusive lower bound token for the first node in the ring. >>>> This also happens to be the token for the last node in the ring. >>>> >>>> In your setup >>>> 10.0.0.19 "owns" (85070591730234615865843651857942052864+1) to 0 >>>> 10.0.0.28 "owns" (0 + 1) to 85070591730234615865843651857942052864 >>>> >>>> (does not imply primary replica, just used to map keys to nodes.) >>>> >>>> >>>> >>>> ----------------- >>>> Aaron Morton >>>> Freelance Developer >>>> @aaronmorton >>>> http://www.thelastpickle.com >>>> >>>> On 5/03/2012, at 11:38 PM, Hontvári József Levente wrote: >>>> >>>> You have to use PropertyFileSnitch and NetworkTopologyStrategy to >>>> create a multi-datacenter setup with two circles. You can start reading >>>> from this page: >>>> >>>> http://www.datastax.com/docs/1.0/cluster_architecture/replication#about-replica-placement-strategy >>>> >>>> Moreover all tokens must be unique (even across datacenters), although >>>> - from pure curiosity - I wonder what is the rationale behind this. >>>> >>>> By the way, can someone enlighten me about the first line in the output >>>> of the nodetool. Obviously it contains a token, but nothing else. It seems >>>> like a formatting glitch, but maybe it has a role. >>>> >>>> On 2012.03.05. 11:06, Tamar Fraenkel wrote: >>>> >>>> Hi! >>>> I have a Cassandra cluster with two nodes >>>> >>>> nodetool ring -h localhost >>>> Address DC Rack Status State Load >>>> Owns Token >>>> >>>> 85070591730234615865843651857942052864 >>>> 10.0.0.19 datacenter1 rack1 Up Normal 488.74 KB >>>> 50.00% 0 >>>> 10.0.0.28 datacenter1 rack1 Up Normal 504.63 KB >>>> 50.00% 85070591730234615865843651857942052864 >>>> >>>> I want to create a second ring with the same name but two different >>>> nodes. >>>> using tokengentool I get the same tokens as they are affected from the >>>> number of nodes in a ring. >>>> >>>> My question is like this: >>>> Lets say I create two new VMs, with IPs: 10.0.0.31 and 10.0.0.11 >>>> *In 10.0.0.31 cassandra.yaml I will set* >>>> initial_token: 0 >>>> seeds: "10.0.0.31" >>>> listen_address: 10.0.0.31 >>>> rpc_address: 0.0.0.0 >>>> >>>> *In 10.0.0.11 cassandra.yaml I will set* >>>> initial_token: 85070591730234615865843651857942052864 >>>> seeds: "10.0.0.31" >>>> listen_address: 10.0.0.11 >>>> rpc_address: 0.0.0.0 >>>> >>>> *Would the rings be separate?* >>>> >>>> Thanks, >>>> >>>> *Tamar Fraenkel * >>>> Senior Software Engineer, TOK Media >>>> >>>> <Mail Attachment.png> >>>> >>>> >>>> ta...@tok-media.com >>>> Tel: +972 2 6409736 >>>> Mob: +972 54 8356490 >>>> Fax: +972 2 5612956 >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >> > >
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