Quorum reads of many keys, so we'd likely hit
every virtual range with our queries, even if num_tokens was 256.
Thanks,
Eric
--
Tyler Hobbs
DataStax http://datastax.com/
--
Richard Low
Acunu | http://www.acunu.com | @acunu
will be possible for others.
In a vnode world if any two nodes are down, then the intersection of
vnode token ranges they have are unavailable.
I think it is two sides of the same coin.
On Mon, Dec 10, 2012 at 7:41 AM, Richard Low r...@acunu.com wrote:
Hi Tyler,
You're right, the math does assume
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--
Richard Low
Acunu | http://www.acunu.com | @acunu
, what's the result? Can Secondary
indexes be used in product? I hope it's my mistake in doing this test.Can
anyone give some tips about it?
Thanks in advance.
fancy
--
Richard Low
Acunu | http://www.acunu.com | @acunu
On 14 April 2013 00:56, Rustam Aliyev rustam.li...@code.az wrote:
Just a followup on this issue. Due to the cost of shuffle, we decided
not to do it. Recently, we added new node and ended up in not well balanced
cluster:
Datacenter: datacenter1
===
Status=Up/Down
|/
: Will there be a problem having multiple keyspaces on a
cluster all with different replication factors, from 1-3?
No.
Richard.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
.
It will also help buffer caching to separate them - the small SSTables
are more likely to remain in cache.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
Remember also that partitioning is done by rows, not columns. So
large rows are stored on a single host. This means they can't be load
balanced and also all requests to that row will hit one host. Having
separate rows will allow load balancing of I/Os.
--
Richard Low
Acunu | http
2011/6/9 Héctor Izquierdo Seliva izquie...@strands.com:
Yeah, but if I have RF=3 then there are three nodes that can answer the
request right?
Yes, if you're happy to read ConsistencyLevel.ONE.
You have key validation class UTF8Type for the standard CF, but
BytesType for the super. This is why the key is 1 for standard, but
printed as 31 for super, which is the hex ascii code for 1. In your
java code, use 1.getBytes() as your key and it should work.
Richard.
--
Richard Low
Acunu
string that starts with a-d with only characters a-z afterwards will
go to N1.
Richard.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
On Thu, Jul 7, 2011 at 3:39 PM, A J s5a...@gmail.com wrote:
Thanks. The above works.
But when I try to use the binary values rather than the hex values, it
does not work. i.e. instead of using 64ff, I use 01100100. Instead of
6Dff, I use 01101101.
When using the binary values, everything
-happyhour.eventbrite.com/
Hope you can join us!
--
Richard Low
Acunu | http://www.acunu.com | @acunu
with 1-8 TB of storage, but
there are cases where bigger or smaller makes sense. Don't overspec
your nodes - you'll be better off with more smaller nodes.
You can use SSDs if you need the random read rate, and SATA drives are fine too.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
On Mon
per second is about right, although you can
probably do some tuning to improve this.
I've also found that the pycassa client uses significant amounts of
CPU, so be careful you are not CPU bound on the client.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
On Thu, Sep 1, 2011 at 2:31 AM
(with the exception of reads with low
consistency levels and read_repair_chance 1.0).
Note also that there is just one read per counter increment, not a
read per replica.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
.
Richard.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
else upgraded and not run into this?
What do you mean by the cluster has been weird since the upgrade?
Have you noticed slow-downs? Any other messages in the logs that have
appeared since the upgrade?
Richard.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
the type for
each column, so they can be different. There is extra storage
overhead for this and care must be taken to ensure all column names
remain comparable.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
. But reading and incrementing is unsafe.
Richard.
--
Richard Low
Acunu | http://www.acunu.com | @acunu
Hi John,
- Each machine needed enough free diskspace to potentially hold the
entire cluster's sstables on disk
I wrote a possible explanation for why Cassandra is trying to use too much
space on your ticket:
https://issues.apache.org/jira/browse/CASSANDRA-5525
if you could provide the
Hi Theo,
The number (let's call it T and the number of nodes N) 256 was chosen to
give good load balancing for random token assignments for most cluster
sizes. For small T, a random choice of initial tokens will in most cases
give a poor distribution of data. The larger T is, the closer to
On 11 June 2013 09:54, Theo Hultberg t...@iconara.net wrote:
But in the paragraph just before Richard said that finding the node that
owns a token becomes slower on large clusters with lots of token ranges, so
increasing it further seems contradictory.
I do mean increase for larger clusters,
On 10 June 2013 22:00, Emalayan Vairavanathan svemala...@yahoo.com wrote:
b) Will Cassandra automatically take care of removing
obsolete keys in future ?
In a future version Cassandra should automatically clean up for you:
On 3 July 2013 21:04, Sávio Teles savio.te...@lupa.inf.ufg.br wrote:
We're using ByteOrderedPartition to programmatically choose the machine
which a objet will be inserted.*
*How can I use *ByteOrderedPartition *with vnode on Cassandra 1.2?
Don't. Managing tokens with ByteOrderedPartitioner
On 3 July 2013 22:18, Sávio Teles savio.te...@lupa.inf.ufg.br wrote:
We were able to implement ByteOrderedPartition on Cassandra 1.1 and
insert an object in a specific machine.
However, with Cassandra 1.2 and VNodes we can't implement VNode with
ByteOrderedPartitioner
to insert an object
On 19 July 2013 23:31, Alexis Rodríguez arodrig...@inconcertcc.com wrote:
Hi guys,
I've read here [1] that you can make a deletion mutation for the future.
That mechanism operates as a schedule for deletions according to the
stackoverflow post. But, I've been having problems to make it work
On 20 July 2013 15:16, Alexis Rodríguez arodrig...@inconcertcc.com wrote:
That's exactly what is happening with my row, but not what I was trying to
do. It seems that I misunderstood the stackoverflow post. I was trying to
schedule a delete for an entire row, is using ttl for columns the only
On 24 July 2013 15:36, Jan Algermissen jan.algermis...@nordsc.com wrote:
is it recommended to set up Cassandra using 'RAID-ed' disks for per-node
reliability or do people usually just rely on having the multiple nodes
anyway - why bother with replicated disks?
It's not necessary, due to
On 29 July 2013 12:00, Pavel Kirienko pavel.kirienko.l...@gmail.com wrote:
Hi,
I failed to install the Debian package of Cassandra 1.2.7 from ASF
repository because of 404 error.
APT said:
http://www.apache.org/dist/cassandra/debian/pool/main/c/cassandra/cassandra_1.2.7_all.deb
404 Not
On 29 July 2013 14:43, Langston, Jim jim.langs...@compuware.com wrote:
Running nodetool and looking at the cfstats output, for the
counters such as write count and read count, do those numbers
reflect any replication ?
For instance, if write count shows 3000 and the replication factor
is
On 5 August 2013 12:30, Christopher Wirt chris.w...@struq.com wrote:
I’m thinking about reducing the number of vnodes per server.
** **
We have 3 DC setup – one with 9 nodes, two with 3 nodes each.
** **
Each node has 256 vnodes. We’ve found that repair operations are beginning
On 5 August 2013 20:04, Christopher Wirt chris.w...@struq.com wrote:
Hello,
** **
Question about counters, replication and the ReplicateOnWriteStage
** **
I’ve recently turned on a new CF which uses a counter column.
** **
We have a three DC setup running Cassandra 1.2.4
On 6 August 2013 08:40, Aaron Morton aa...@thelastpickle.com wrote:
The reason for me looking at virtual nodes is because of terrible
experiences we had with 0.8 repairs and as per documentation (an logically)
the virtual nodes seems like it will help repairs being smoother. Is this
true?
On 6 August 2013 15:12, Keith Freeman 8fo...@gmail.com wrote:
I've seen in several places the advice to use queries like to this page
through lots of rows:
select id from mytable where token(id) token(last_id)
But it's hard to find detailed information about how this works (at least
On 6 August 2013 16:56, Keith Freeman 8fo...@gmail.com wrote:
Your description makes me think that if new rows are added during the
paging (i.e. between one select with token()'s and another), they might
show up in the query results, right? (because the hash of the new row keys
might fall
On 13 August 2013 10:15, Alain RODRIGUEZ arodr...@gmail.com wrote:
Streaming from all the physical nodes in the cluster should make repair
faster, for the same reason it makes bootstrap faster. Shouldn't it ?
Virtual nodes doesn't speed up either very much. Repair and bootstrap will
be
On 14 August 2013 20:02, Andrew Cobley a.e.cob...@dundee.ac.uk wrote:
I have small test cluster of 2 nodes. I ran a stress test on it and with
nodetool status received the following:
/usr/local/bin/apache-cassandra-2.0.0-rc1/log $ ../bin/nodetool status
Datacenter: datacenter1
You can do it by using two types of query. One using token as you suggest,
the other by fixing the partition key and walking through the other parts
of the composite primary key.
For example, consider the table:
create table paging (a text, b text, c text primary key (a, b));
I inserted ('1',
On 29 August 2013 01:55, Ike Walker ike.wal...@flite.com wrote:
What is the best practice for how many seed nodes to have in a Cassandra
cluster? I remember reading a recommendation of 2 seeds per datacenter in
Datastax documentation for 0.7, but I'm interested to know what other
people are
On 30 August 2013 18:42, Jeremiah D Jordan jeremiah.jor...@gmail.comwrote:
You need to introduce the new vnode enabled nodes in a new DC. Or you
will have similar issues to
https://issues.apache.org/jira/browse/CASSANDRA-5525
Add vnode DC:
On 8 September 2013 02:55, Tim Dunphy bluethu...@gmail.com wrote:
Hey all,
I'm seeing this exception in my cassandra logs:
Exception during http request
mx4j.tools.adaptor.http.HttpException: file
mx4j/tools/adaptor/http/xsl/w00tw00t.at.ISC.SANS.DFind:) not found
at
On 19 September 2013 02:06, Jayadev Jayaraman jdisal...@gmail.com wrote:
We use vnodes with num_tokens = 256 ( 256 tokens per node ) . After loading
some data with sstableloader , we find that the cluster is heavily
imbalanced :
How did you select the tokens? Is this a brand new cluster
On 19 September 2013 10:31, Rene Kochen rene.koc...@schange.com wrote:
I use Cassandra 1.0.11
If I do cfstats for a particular column family, I see a Compacted row
maximum size of 43388628
However, when I do a cfhistograms I do not see such a big row in the Row
Size column. The biggest row
.
Thanks,
Suruchi
On Sep 19, 2013, at 3:46, Richard Low rich...@wentnet.com wrote:
On 19 September 2013 02:06, Jayadev Jayaraman jdisal...@gmail.com wrote:
We use vnodes with num_tokens = 256 ( 256 tokens per node ) . After
loading some data with sstableloader , we find that the cluster
The only thing you need to guarantee is that Cassandra doesn't start with
num_tokens=1 (the default in 1.2.x) or, if it does, that you wipe all the
data before starting it with higher num_tokens.
On 19 September 2013 19:07, Robert Coli rc...@eventbrite.com wrote:
On Thu, Sep 19, 2013 at 10:59
On 19 September 2013 20:36, Suruchi Deodhar
suruchi.deod...@generalsentiment.com wrote:
Thanks for your replies. I wiped out my data from the cluster and also
cleared the commitlog before restarting it with num_tokens=256. I then
uploaded data using sstableloader.
However, I am still not
On 1 October 2013 16:21, Rene Kochen rene.koc...@schange.com wrote:
Quick question.
I am using Cassandra 1.0.11
When is nodetool cfhistograms output reset? I know that data is collected
during read requests. But I am wondering if it is data since the beginning
(start of Cassandra) or if it
On 11 October 2013 14:03, thorsten.s...@t-systems.com wrote:
I found the issue below concerning inactive client connections (see
*Cassandra
Security*http://jkb.netii.net/index.php/pub/sinosqldb/cassandra-security).
We are using Cassandra 1.2.4 and the Cassandra JDBC driver as client. Is
On 8 April 2014 09:29, vck veesee...@gmail.com wrote:
After reading through the vnodes and partitioning described in the
datastax documentation, I am still confused about how rows are
partitioned/replicated.
With vnodes, I know that each Node on the ring now supports many token
ranges per
On 16 April 2014 05:08, Jonathan Lacefield jlacefi...@datastax.com wrote:
Assuming you have enough nodes not undergoing move to meet your CL
requirements, then yes, your cluster will still accept reads and writes.
However, it's always good to test this before doing it in production to
ensure
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