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From Tamar Fraenkel <ta...@tok-media.com>
Subject Re: Failure in Cassandra Ring Running on ESXi (Ubuntu 11.10)
Date Thu, 15 Mar 2012 09:38:52 GMT
Thanks for your prompt response.
I have a problem though. I installed cassandra following DataStax, and
cassandra is not a daemon. i.e. I have to manyally start it, and I don't
have a script /etc/init.d/cassandra.

For this reason, I need to restart it after rebooting my vm manually, and
it is not part of the rc...

Any good points on how to set up cassandra as a daemon?

Thanks,

*Tamar Fraenkel *
Senior Software Engineer, TOK Media

[image: Inline image 1]

tamar@tok-media.com
Tel:   +972 2 6409736
Mob:  +972 54 8356490
Fax:   +972 2 5612956





On Thu, Mar 15, 2012 at 11:34 AM, aaron morton <aaron@thelastpickle.com>wrote:

> 1. How can I prevent this? I guess my setup is limited, and this may
> happen, but is there a way to improve things.
>
> Not really, you need more memory on the box.
>
>
> 2. Assuming that I will run out of memory from time to time, how do I
> setup a monit \ god task to restart cassandra in case it does.
>
> Super simple, to the point of not been very good,
> /etc/monit/conf.d/cassandra.monitrc
> The monit docs are pretty good.
>
> check process cassandra with pidfile /var/run/cassandra.pid
>   start program = "/etc/init.d/cassandra start"
>   stop program = "/etc/init.d/cassandra stop"
>
> You will also need to prevent the init.d script from starting, i
> used update-rc.d
>
> I'm not an ops guy; google is your friend; the monit docs are good.
>
> Cheers
>
>
>   -----------------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 15/03/2012, at 8:44 PM, Tamar Fraenkel wrote:
>
> I added a third node to the cluster. Sure enough, this morning I come and
> only one node is up, in the other two the cassandra process is not running.
>
> In the cassandra log there is nothing, but in /var/log/syslog I see
> In one node:
> Mar 15 07:50:51 Cassandra3 kernel: [58566.666906] Out of memory: Kill
> process 2840 (java) score 383 or sacrifice child
> Mar 15 07:50:51 Cassandra3 kernel: [58566.667066] Killed process 2840
> (java) total-vm:956792kB, anon-rss:689752kB, file-rss:21680kB
> And in the other:
> Mar 14 18:36:02 Cassandra2 kernel: [16262.267300] Out of memory: Kill
> process 2611 (java) score 409 or sacrifice child
> Mar 14 18:36:02 Cassandra2 kernel: [16262.267325] Killed process 2611
> (java) total-vm:968040kB, anon-rss:748644kB, file-rss:18436kB
>
> Two questions:
> 1. How can I prevent this? I guess my setup is limited, and this may
> happen, but is there a way to improve things.
> 2. Assuming that I will run out of memory from time to time, how do I
> setup a monit \ god task to restart cassandra in case it does.
>
> Thanks,
>
> *Tamar Fraenkel *
> Senior Software Engineer, TOK Media
>
> <tokLogo.png>
>
> tamar@tok-media.com
> Tel:   +972 2 6409736
> Mob:  +972 54 8356490
> Fax:   +972 2 5612956
>
>
>
>
>
> On Tue, Mar 13, 2012 at 11:12 AM, aaron morton <aaron@thelastpickle.com>wrote:
>
>> If you are on Ubuntu it may be this
>> http://wiki.apache.org/cassandra/FAQ#ubuntu_hangs
>>
>> otherwise I would look for GC problems.
>>
>> Cheers
>>
>>
>>   -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 13/03/2012, at 7:53 PM, Tamar Fraenkel wrote:
>>
>> Done it. Now it generally runs ok, till one of the nodes get's stuck with
>> 100% cpu and I need to reboot it.
>>
>> Last lines in the system.log just before are:
>>  INFO [OptionalTasks:1] 2012-03-13 07:36:43,850 MeteredFlusher.java (line
>> 62) flushing high-traffic column family CFS(Keyspace='tok',
>> ColumnFamily='tk_vertical_tag_story_indx') (estimated 35417890 bytes)
>>  INFO [OptionalTasks:1] 2012-03-13 07:36:43,869 ColumnFamilyStore.java
>> (line 704) Enqueuing flush of Memtable-tk_vertical_tag_story_indx@2002820169(1620316/35417890
>> serialized/live bytes, 30572 ops)
>>  INFO [FlushWriter:76] 2012-03-13 07:36:43,869 Memtable.java (line 246)
>> Writing Memtable-tk_vertical_tag_story_indx@2002820169(1620316/35417890
>> serialized/live bytes, 30572 ops)
>>  INFO [FlushWriter:76] 2012-03-13 07:36:44,015 Memtable.java (line 283)
>> Completed flushing
>> /opt/cassandra/data/tok/tk_vertical_tag_story_indx-hc-191-Data.db (2134123
>> bytes)
>>  INFO [OptionalTasks:1] 2012-03-13 07:37:37,886 MeteredFlusher.java (line
>> 62) flushing high-traffic column family CFS(Keyspace='tok',
>> ColumnFamily='tk_vertical_tag_story_indx') (estimated 34389135 bytes)
>>  INFO [OptionalTasks:1] 2012-03-13 07:37:37,887 ColumnFamilyStore.java
>> (line 704) Enqueuing flush of Memtable-tk_vertical_tag_story_indx@1869953681(1573252/34389135
>> serialized/live bytes, 29684 ops)
>>  INFO [FlushWriter:76] 2012-03-13 07:37:37,887 Memtable.java (line 246)
>> Writing Memtable-tk_vertical_tag_story_indx@1869953681(1573252/34389135
>> serialized/live bytes, 29684 ops)
>>  INFO [FlushWrit
>>
>> Any idea?
>> I am considering adding a third node, so that replication factor of 2
>> won't stuck my system when one node goes down. Does it make sense?
>>
>> Thanks
>>
>>
>> *Tamar Fraenkel *
>> Senior Software Engineer, TOK Media
>>
>> <tokLogo.png>
>>
>> tamar@tok-media.com
>> Tel:   +972 2 6409736
>> Mob:  +972 54 8356490
>> Fax:   +972 2 5612956
>>
>>
>>
>>
>>
>> On Tue, Mar 6, 2012 at 7:51 PM, aaron morton <aaron@thelastpickle.com>wrote:
>>
>>> Reduce these settings for the CF
>>> row_cache (disable it)
>>> key_cache (disable it)
>>>
>>> Increase these settings for the CF
>>> bloom_filter_fp_chance
>>>
>>> Reduce these settings in cassandra.yaml
>>>
>>> flush_largest_memtables_at
>>> memtable_flush_queue_size
>>> sliced_buffer_size_in_kb
>>> in_memory_compaction_limit_in_mb
>>> concurrent_compactors
>>>
>>>
>>> Increase these settings
>>> index_interval
>>>
>>>
>>> While it obviously depends on load, I would not be surprised if you had
>>> a lot of trouble running cassandra with that setup.
>>>
>>> Cheers
>>> A
>>>
>>>
>>>   -----------------
>>> Aaron Morton
>>> Freelance Developer
>>> @aaronmorton
>>> http://www.thelastpickle.com
>>>
>>> On 6/03/2012, at 11:02 PM, Tamar Fraenkel wrote:
>>>
>>> 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
>>>
>>> <tokLogo.png>
>>>
>>> tamar@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 <aaron@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>
>>>>
>>>> tamar@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 <tamar@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>
>>>>>
>>>>>
>>>>> tamar@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 <aaron@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>
>>>>>>
>>>>>>
>>>>>> tamar@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 <
>>>>>> aaron@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>
>>>>>>>
>>>>>>>
>>>>>>> tamar@tok-media.com
>>>>>>> Tel:   +972 2 6409736
>>>>>>> Mob:  +972 54 8356490
>>>>>>> Fax:   +972 2 5612956
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

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