From my experience, and what I've read, more the RAM the better. Any excess
memory can be used as disk cache, which should help with your reads a lot.
-Arindam
-Original Message-
From: Paolo Crosato [mailto:paolo.cros...@targaubiest.com]
Sent: Tuesday, September 09, 2014 12:53 PM
To:
Answers inline.
From: Lu, Boying [mailto:boying...@emc.com]
Sent: Wednesday, April 30, 2014 12:20 AM
To: user@cassandra.apache.org
Subject: Some questions to adding a new datacenter into cassandra cluster.
Hi, All,
I need to add a Cassandra (running on a three nodes) fresh installed in a
This thread should answer your questions:
http://stackoverflow.com/questions/15925549/how-cassandra-split-keyspace-data-when-multiple-dirctories-found
From: Yatong Zhang [mailto:bluefl...@gmail.com]
Sent: Wednesday, April 30, 2014 2:03 AM
To: user@cassandra.apache.org
Subject: Can Cassandra
For new nodes that you want to bootstrap into the cluster you can specify
any nodes you wish.
Note that you want to keep your seed list consistent across your cluster though.
From: Mark Reddy [mailto:mark.re...@boxever.com]
Sent: Tuesday, April 29, 2014 2:26 AM
To: user@cassandra.apache.org
What you have described below should work just fine.
When I was replacing nodes in my ring, I ended up creating a new datacenter
with the new nodes, but I was upgrading to vnodes too at the time.
-Arindam
From: nash [mailto:nas...@gmail.com]
Sent: Monday, April 28, 2014 10:52 PM
To:
If you don’t have row caching turned on, you can try changing settings to get
your memtables to flush faster (read more at the datastax documention at [1]).
Btw, if you are using a pre-1.2 version, your bloom filter might come into play
as well.
All said and done, if your write request rate
I am running Cassandra 1.2.12 on CentOS 5.10.
Was running 1.1.15 previously without any issues as well.
-Arindam
From: Donald Smith [mailto:donald.sm...@audiencescience.com]
Sent: Tuesday, February 25, 2014 3:40 PM
To: user@cassandra.apache.org
Subject: RE: Supported Cassandra version for
As an update - finally got the node to join the ring.
Restarting all the nodes in the cluster, followed by a clean bootstrap of the
node that was stuck did the trick.
-Arindam
From: Arindam Barua [mailto:aba...@247-inc.com]
Sent: Monday, February 24, 2014 5:04 PM
To: user@cassandra.apache.org
)
Streaming from /10.67.XXX.XXX failed
From: Arindam Barua [mailto:aba...@247-inc.com]
Sent: Tuesday, February 18, 2014 5:16 PM
To: user@cassandra.apache.org
Subject: RE: Bootstrap stuck: vnode enabled 1.2.12
I believe you are talking about CASSANDRA-6685, which was introduced in 1.2.15.
I'm trying
The node is still out of the ring. Any suggestions on how to get it in will be
very helpful.
From: Arindam Barua [mailto:aba...@247-inc.com]
Sent: Friday, February 14, 2014 1:04 AM
To: user@cassandra.apache.org
Subject: Bootstrap stuck: vnode enabled 1.2.12
After our otherwise successful
Subject: Re: Bootstrap stuck: vnode enabled 1.2.12
There is a bug where a node without schema can not bootstrap. Do you have
schema?
On Tue, Feb 18, 2014 at 1:29 PM, Arindam Barua
aba...@247-inc.commailto:aba...@247-inc.com wrote:
The node is still out of the ring. Any suggestions on how to get
After our otherwise successful upgrade procedure to enable vnodes, when adding
back new hosts to our cluster, one non-seed host ran into a hardware issue
during bootstrap. By the time the hardware issue was fixed a week later, all
other nodes were added successfully, cleaned, repaired. The
subsequently.
-Original Message-
From: Chris Burroughs [mailto:chris.burrou...@gmail.com]
Sent: Monday, January 06, 2014 10:00 AM
To: user@cassandra.apache.org
Subject: Re: vnode in production
On 01/02/2014 01:51 PM, Arindam Barua wrote:
1. the stability of vnodes in production
I'm
Hello all,
Just wanted to check if anyone has any experiences to share regarding
1. the stability of vnodes in production
2. upgrading to vnodes in production
We recently upgraded to 1.2.12 in production and were planning to turn on
vnodes using the adding a new datacenter method
Do you have any snapshots on the nodes where you are seeing this issue?
Snapshots will link to sstables which will cause them not be deleted.
-Arindam
From: Narendra Sharma [mailto:narendra.sha...@gmail.com]
Sent: Sunday, December 15, 2013 1:15 PM
To: user@cassandra.apache.org
Subject:
Apache Cassandra Consulting
http://www.thelastpickle.com
On 21/11/2013, at 12:42 pm, Arindam Barua
aba...@247-inc.commailto:aba...@247-inc.com wrote:
Thanks for the suggestions Aaron.
As a follow up, we ran a bunch of tests with different combinations of these
changes on a 2-node ring
as well.
It's easier to tune the system if you can provide some info on the workload.
Cheers
-
Aaron Morton
New Zealand
@aaronmorton
Co-Founder Principal Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com
On 7/11/2013, at 12:35 pm, Arindam Barua
aba...@247
I see 100 000 recommended in the Datastax documentation for thenofile limit
since Cassandra 1.2 :
http://www.datastax.com/documentation/cassandra/2.0/webhelp/cassandra/install/installRecommendSettings.html
-Arindam
From: Pieter Callewaert [mailto:pieter.callewa...@be-mobile.be]
Sent:
We want to upgrade our Cassandra cluster to have newer hardware, and were
wondering if anyone has suggestions on Cassandra or linux config changes that
will prove to be beneficial.
As of now, our performance tests (our application specific as well as
cassandra-stress) are not showing any
data do you got per node ?
- What is the value of the index_intval (cassandra.yaml) ?
If you are trying to fix this, you can try :
- changing the memtable_total_space_in_mb to 1024
- increasing the heap to 10GB.
Hope this will help somehow :).
Good luck
2013/10/16 Arindam Barua
On 23/10/2013, at 1:08 PM, Arindam Barua
aba...@247-inc.commailto:aba...@247-inc.com wrote:
We are not doing deletes, but are setting ttls of 8 days on most of our columns
(these are not updates to existing columns). Hence it seems safe to reduce
gc_grace_seconds to even 0 from a tombstones
We currently have 2 datacenters and a ring of 5 Cassandra servers on each
datacenter. We are getting new hardware, and after evaluating them, plan to
upgrade the ring to the new hardware.
Is there any recommended procedure for doing so? This is one of the options we
are considering:
1.
://www.datastax.com/docs/1.0/operations/cluster_management
From: Robert Coli [mailto:rc...@eventbrite.com]
Sent: Friday, October 18, 2013 11:50 AM
To: user@cassandra.apache.org
Subject: Re: upgrading Cassandra server hardware best practice?
On Fri, Oct 18, 2013 at 11:39 AM, Arindam Barua
aba
is three 1TB disks with software RAID 0, to appear as a single
disk of 3TB.
Does this confirm that I have a slow disk problem? If so, any other ways to
help other than moving to SSDs and adding more Cassandra nodes.
Thanks,
Arindam
From: Arindam Barua [mailto:aba...@247-inc.com]
Sent: Monday
We don't do any deletes in our cluster, but do set ttls of 8 days on most of
the columns. After reading a bunch of earlier threads, I have concluded that I
can safely set gc_grace_seconds to 0 and not have to worry about expired
columns coming back to life. However, I wanted to know if there
During performance testing being run on our 4 node Cassandra 1.1.5 cluster, we
are seeing warning logs about the heap being almost full - [1]. I'm trying to
figure out why, and how to prevent it.
The tests are being run on a Cassandra ring consisting of 4 dedicated boxes
with 32 GB of RAM
and separately for both of
course so you can see the effect).
On Thu, Jun 27, 2013 at 2:27 AM, Arindam Barua
aba...@247-inc.commailto:aba...@247-inc.com wrote:
In our performance tests, we are seeing similar FlushWriter, MutationStage,
MemtablePostFlusher pending tasks become non-zero. We collect
of cluster and check for a split schema using cassandra-cli (FAQ on the
wiki has help for split schema)
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 27/06/2013, at 8:57 AM, Arindam Barua
aba...@247
In our performance tests, we are seeing similar FlushWriter, MutationStage,
MemtablePostFlusher pending tasks become non-zero. We collect snapshots every 5
minutes, and they seem to clear after ~10-15 minutes though. (The flush writer
has an 'All time blocked' count of 540 in the below
...@eventbrite.com]
Sent: Tuesday, June 25, 2013 11:15 AM
To: user@cassandra.apache.org
Subject: Re: Problems with node rejoining cluster
On Mon, Jun 24, 2013 at 11:19 PM, Arindam Barua aba...@247-inc.com wrote:
- We do not specify any tokens in cassandra.yaml relying on
bootstrap
We need to do a rolling upgrade of our Cassandra cluster in production, since
we are upgrading Cassandra on solaris to Cassandra on CentOS.
(We went with solaris initially since most of our other hosts in production are
solaris, but were running into some lockup issues during perf tests, and
clients?
Btw, using Hector's SliceQuery() and reading into a List, or Astynax seem to
result in similar times too.
Thanks,
Arindam
-Original Message-
From: Arindam Barua [mailto:aba...@247-inc.com]
Sent: Wednesday, October 03, 2012 10:54 AM
To: user@cassandra.apache.org
Subject: RE: Read
Did you use the --cql3 option with the cqlsh command?
From: Vivek Mishra [mailto:mishra.v...@gmail.com]
Sent: Monday, October 08, 2012 7:22 PM
To: user@cassandra.apache.org
Subject: Using compound primary key
Hi,
I am trying to use compound primary key column name and i am referring to:
want to play with
more nodes and re-run. If you run a test with PlayOrm, I would love to know
the results there as well.
Later,
Dean
From: Arindam Barua aba...@247-inc.commailto:aba...@247-inc.com
Reply-To:
user@cassandra.apache.orgmailto:user@cassandra.apache.org
user
. Anyways, you may want
to play with more nodes and re-run. If you run a test with PlayOrm, I
would love to know the results there as well.
Later,
Dean
From: Arindam Barua
aba...@247-inc.commailto:aba...@247-inc.commailto:aba...@247-inc.com%3cmailto:aba...@247-inc.com
We are trying to setup a Cassandra cluster and have low read latency
requirements. Running some tests, we do not see the performance that we were
hoping for. Wanted to check if anyone has thoughts on:
1. If these are expected latency times for the data/machine config, etc
2. If
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