Rob,
It is inevitable that the repairs are needed to keep consistency guarantees. Is
it worthwhile to consider RAID-0 as we get more storage? One can treat loss of
disk as loss of node and rebuild the node and repair. Any other suggestions are
most welcome.
-Sri
_
Thanks for the reply Rob.
Date: Thu, 16 Oct 2014 11:46:52 -0700
Subject: Re: validation compaction
From: rc...@eventbrite.com
To: user@cassandra.apache.org
On Thu, Oct 16, 2014 at 6:41 AM, S C wrote:
Bob,
Bob is my father's name. Unless you need a gastrointestinal consult, you
pro
...@outlook.com
To: user@cassandra.apache.org
Subject: RE: validation compaction
Date: Tue, 14 Oct 2014 17:09:14 -0500
Thanks Rob.
Date: Mon, 13 Oct 2014 13:42:39 -0700
Subject: Re: validation compaction
From: rc...@eventbrite.com
To: user@cassandra.apache.org
On Mon, Oct 13, 2014 at 1:04 PM, S
Thanks Rob.
Date: Mon, 13 Oct 2014 13:42:39 -0700
Subject: Re: validation compaction
From: rc...@eventbrite.com
To: user@cassandra.apache.org
On Mon, Oct 13, 2014 at 1:04 PM, S C wrote:
I have started repairing a 10 node cluster with one of the table having > 1TB
of data. I notice t
I have started repairing a 10 node cluster with one of the table having > 1TB
of data. I notice that the validation compaction actually shows >3 TB in the
"nodetool compactionstats" bytes total. However, I have less than 1TB data on
the machine. If I take into consideration of 3 replicas then 3T
I recently added nodes to existing cluster and removed some. "nodetool
gossipinfo" doesn't show the non existing nodes but a thread dump on cassandra
reveals it is trying to write to the non existing old node. I tried restarting
the cluster using "-Dcassandra.load_ring_state=false" on each node
When I run "nodetoool ring" I see the ownership with different percentages.
However, LOAD column shows not a huge deviation. Why is that? I am using
Datastax 3.0.
http://pastebin.com/EcWbZn26
d them off. Otherwise
they will start to use disk space as the live SSTables diverge from the
snapshots/incrementals.
-psanford
On Sat, Jun 14, 2014 at 10:17 AM, S C wrote:
Is it ok to delete files from backups directory (hardlinks) once I have it
copied over remotely? Any caution to tak
Despite storing a replica in the "backup node", what is the guarantee that the
"backup node" has all the data? Unless you make consistency a priority over
availability of your cluster.
I could think of another approach.
You can design your cluster with a topology such that your work load is spl
Is it ok to delete files from backups directory (hardlinks) once I have it
copied over remotely? Any caution to take?
Thanks,Kumar
of
how many will be needed.
in 1.1 you will OOM far before you hit the limit,. In theory though, the
compaction executor is a little special cased and will actually throw an
exception (normally it will block)
Chris
On Jun 9, 2014, at 7:49 AM, S C wrote:Thank you all for
valuable suggestions
t_in_mb" value.
Thanks,
On Sun, Jun 8, 2014 at 11:27 PM, S C wrote:
I am using Cassandra 1.1 (sorry bit old) and I am seeing high pending
compaction count. "pending tasks: 67" while active compaction tasks are not
more than 5. I have a 24CPU machine. Shouldn't I be see
? e.g. even under
> no load, they don't go away?
>
> -Bill
>
>
> On 06/08/2014 12:32 PM, Jake Luciani wrote:
> > 2&3
> >
> > On Sunday, June 8, 2014, S C > <mailto:as...@outlook.com>> wrote:
> >
> > I am using Cassa
I am using Cassandra 1.1 (sorry bit old) and I am seeing high pending
compaction count. "pending tasks: 67" while active compaction tasks are not
more than 5. I have a 24CPU machine. Shouldn't I be seeing more compactions? Is
this a pattern of high writes and compactions backing up? How can I im
Thank you all for your valuable comments and information.
-SC
> Date: Tue, 3 Sep 2013 12:01:59 -0400
> From: chris.burrou...@gmail.com
> To: user@cassandra.apache.org
> CC: fsareshw...@quantcast.com
> Subject: Re: row cache
>
> On 09/01/2013 03:06 PM, Faraaz Sareshwala wrote:
> > Yes, that is c
It is my understanding that row cache is on the memory (Not on disk). It could
live on heap or native memory depending on the cache provider? Is that right?
-SC
> Date: Fri, 23 Aug 2013 18:58:07 +0100
> From: b...@dehora.net
> To: user@cassandra.apache.org
> Subject: Re: row cache
>
> I can't
, right? I
thought that truncate, like drop table, created a snapshot (unless that feature
had been disabled in your yaml.
On Thu, Aug 29, 2013 at 6:51 PM, Robert Coli wrote:
On Thu, Aug 29, 2013 at 3:48 PM, S C wrote:
Do we have to run "nodetool repair" or "nodetool
Do we have to run "nodetool repair" or "nodetool cleanup" after Truncating a
Column Family?
Thanks,SC
Aug 29, 2013 at 10:49 AM, S C wrote:
> >> I see a high count "All time blocked" for Flush Writer on nodetool tpstats.
> >>
> >> Is it how many blocked ever since the server was online? Can somebody
> >> explain me what it is? I really appreciate it
Thanks Rob. Will it contribute to any performance problems?
Thanks,SC
Date: Thu, 29 Aug 2013 10:57:30 -0700
Subject: Re: Flush writer all time blocked
From: rc...@eventbrite.com
To: user@cassandra.apache.org
On Thu, Aug 29, 2013 at 10:49 AM, S C wrote:
I see a high count "All
I see a high count "All time blocked" for Flush Writer on nodetool tpstats.
Is it how many blocked ever since the server was online? Can somebody explain
me what it is? I really appreciate it.
http://pastebin.com/GAiu2q74
Thanks,SC
this time you merely have a connectivity issue e.g. a firewall blocking
traffic.
From: S C
Sent: Tuesday, June 25, 2013 5:28 PM
To: user@cassandra.apache.org
Subject: RE: copy data between clusters
Bob and Arthur - thanks for your inputs.
I tried sstableloader but ran into below issue
225.64.2]
Thanks,SC
> Date: Tue, 25 Jun 2013 11:20:03 -0700
> Subject: Re: copy data between clusters
> From: rc...@eventbrite.com
> To: user@cassandra.apache.org
>
> On Mon, Jun 24, 2013 at 8:35 PM, S C wrote:
> > I have a scenario here. I have a cluster A and cluster B
I have a scenario here. I have a cluster A and cluster B running on cassandra
1.1. I need to copy data from Cluster A to Cluster B. Cluster A has few
keyspaces that I need to copy over to Cluster B. What are my options?
Thanks,SC
How big is your HEAP?
From: as...@outlook.com
To: user@cassandra.apache.org
Subject: RE: Cassandra periodically stops responding to write requests under
load
Date: Fri, 14 Jun 2013 10:09:24 -0500
What version of Cassandra are you using? Did you look if Cassandra is under
going GC?
-SC
From:
What version of Cassandra are you using? Did you look if Cassandra is under
going GC?
-SC
From: james@metaswitch.com
To: user@cassandra.apache.org
Subject: Cassandra periodically stops responding to write requests under load
Date: Fri, 14 Jun 2013 14:19:57 +
Hello,
I have been
What was the node doing right before the ERROR? Can you post some more log?
Thanks,SC
Date: Fri, 31 May 2013 10:57:38 +0530
From: himanshu.jo...@orkash.com
To: user@cassandra.apache.org
Subject: java.lang.AssertionError on starting the node
Hi,
I have created a 2 nod
I have added two nodes to the cluster running on 1.1.9 and when I run a
"nodetool cleanup" I see the following in the logs.
INFO [CompactionExecutor:7] 2013-05-28 22:41:58,480 CompactionManager.java
(line 531) Cleanup cannot run before a node has joined the ring
However, "nodetool ring/gossip/inf
sometimes works.
If not post the output from nodetool gossipinfo
Cheers
-Aaron MortonFreelance Cassandra ConsultantNew Zealand
@aaronmortonhttp://www.thelastpickle.com
On 5/04/2013, at 9:38 AM, S C wrote:Is there a way to force
gossip among the nodes?
From: as...@outlook.com
To
4, 2013, at 6:11 PM, S C wrote:I was in the middle
of upgrade to 1.1.9. I brought one node with 1.1.9 while the other were running
on 1.1.5. Once one of the node was on 1.1.9 it is no longer recognizing other
nodes in the ring.
On 192.168.56.10 and 11
192.168.56.10 DC1-CassRAC1
les of the down nodes? Did you run
upgradesstables? You need to upgradesstables when moving from < 1.1.7 to 1.1.9
On Apr 4, 2013, at 6:11 PM, S C wrote:I was in the middle
of upgrade to 1.1.9. I brought one node with 1.1.9 while the other were running
on 1.1.5. Once one of the node was on 1
I was in the middle of upgrade to 1.1.9. I brought one node with 1.1.9 while
the other were running on 1.1.5. Once one of the node was on 1.1.9 it is no
longer recognizing other nodes in the ring.
On 192.168.56.10 and 11
192.168.56.10 DC1-CassRAC1Up Normal 28.06 GB50.00%
t;repair" and "merkle tree"
>
> - Original Message -
> From: "S C"
> To: user@cassandra.apache.org
> Sent: Monday, March 25, 2013 2:55:30 PM
> Subject: nodetool repair hung?
>
>
> I am using Cassandra 1.1.5.
>
>
> nodetool
I am using Cassandra 1.1.5.
nodetool repair is not coming back on the command line. Did it ran
successfully? Did it hang? How do you find if the repair was successful?I did
not find anything in the logs."nodetool compactionstats" and "nodetool
netstats" are clean.
nodetool compactionstats pend
Apparently max user process was set very low on the machine.
How to check?ulimit -u
Set it to unlimited /etc/security/limits.conf
* soft nprocs unlimited* hard nprocs unlimited
From: as...@outlook.com
To: user@cassandra.apache.org
Subject: RE: java.lang.OutOfMemoryError: unable to create new n
I think I figured out where the issue is. I will keep you posted soon.
From: as...@outlook.com
To: user@cassandra.apache.org
Subject: java.lang.OutOfMemoryError: unable to create new native thread
Date: Fri, 15 Mar 2013 17:54:25 -0500
I have a Cassandra node that is going down frequently with
I have a Cassandra node that is going down frequently with
'java.lang.OutOfMemoryError: unable to create new native thread". Its a 16GB VM
out of which 4GB is set as Xmx and there are no other process running on the
VM. I have about 300 clients connecting to this node on an average. I have no
aaronmortonhttp://www.thelastpickle.com
On 16/02/2013, at 4:41 AM, S C wrote:I appreciate any
advise or pointers on this.
Thanks in advance.
From: as...@outlook.com
To: user@cassandra.apache.org
Subject: Question on Cassandra Snapshot
Date: Thu, 14 Feb 2013 20:47:14 -0600
I have been looking at incremen
I appreciate any advise or pointers on this.
Thanks in advance.
From: as...@outlook.com
To: user@cassandra.apache.org
Subject: Question on Cassandra Snapshot
Date: Thu, 14 Feb 2013 20:47:14 -0600
I have been looking at incremental backups and snapshots. I have done some
experimentation but co
I have been looking at incremental backups and snapshots. I have done some
experimentation but could not come to a conclusion. Can somebody please help me
understanding it right?
/data is my data partition
With incremental_backup turned OFF in Cassandra.yaml - Are all SSTables are
under /data/Te
I have some data in my keyspaces. When I increase replication factor of a
existing keyspaces say from 2 to 3, will a nodetool repair create a a new
replica on one of the other node in the cluster? Can somebody explain?
Thanks,SC
At what point is it ok to move the incremental back up from the server to
offsite?Is it recommended to flush the node before doing this?
Thanks,SC
In one of the scenarios that I encountered, I needed to change the token on the
node. I added new token and started the node
with-Dcassandra.load_ring_state=false in anticipation that the node will not
pick from the locally persisted data. Is that the right way to do? or
-Dcassandra.load_ring_s
like. Take care to only do
one move operation at a time in the ring and also do a repair –pr and cleanup
after the move operation.
See nodetool move for more information
Best,michael
From: S C
Reply-To: "user@cassandra.apache.org"
Date: Friday, February 8, 2013 6:54 PM
I am trying to change the token of the Cassandra node but it is using a saved
token. I have tried "-Dcassandra.load_ring_state=false" in the startup script
but did not find it useful. Any thoughts?
Thanks,SC
.
Cheers
-Aaron MortonFreelance Cassandra DeveloperNew Zealand
@aaronmortonhttp://www.thelastpickle.com
On 29/01/2013, at 6:29 AM, S C wrote:
One of our node in a 3 node cluster drifted by ~ 20-25 seconds. While I figured
this pretty quickly, I had few questions that am looking
One of our node in a 3 node cluster drifted by ~ 20-25 seconds. While I figured
this pretty quickly, I had few questions that am looking for some answers.
We can always be proactive in keeping the time sync. But, Is there any way to
recover from a time drift (in a reactive manner)? Since it wa
Aaron,
Can this also be considered?
Connect to node using cassandra-cliuse system;set
LocationInfo[utf8('L')][utf8('ClusterName')]=utf8('');exit;Run nodetool flush on the nodeUpdate cassandra.yaml file with new
cluster_nameRestart node.
Thanks,SC
From: aa...@thelastpickle.com
Subject: Re: change
I tried Helenos 1.3. It looks pretty good.
I created a test account with the role "ROLE_USER". With this user, I am able
to create KS/CF's and drop them as well. Is this intended?I was expecting that
the user with role "ROLE_USER" should be able to browse data but not create or
delete it.
Than
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