We are pleased to announce the 2017 Next Generation Cassandra Conference
(NGCC) that will be held on Tuesday September 26th at the Geekdom Event
Center in San Antonio, Texas. This one day conference is targed toward
Apache Cassandra developers and large-scale cluster operators, but is
opened to
://events.linuxfoundation.org/events/apache-big-data-europe/program/cfp
You have until 10 July to put your proposals together. You will be notified
by 24 July whether or not your proposal is accepted.
Kind Regards,
Gary Dusbabek
If your cluster has the overall IO capacity to perform a simultaneous
compaction on every node and still adequately service reads and
writes, then yes. If you're concerned about availability, your best
bet will be to stagger the compactions.
Gary.
On Fri, Feb 25, 2011 at 04:24, Daniel
I haven't tried this, but it should work in theory...
Keep the wrongly named index for now. Create the rightly named index,
then bring down the node and swap file names for the indexes. After
that, you can safely drop the wrongly named index. Unfortunately,
you need to do this for each node.
The first thing you should try is to restart the node that is not
syncing. That will reset the version it gossips, which was not always
getting updated (fixed in CASSANDRA-2083).
Gary.
On Tue, Feb 15, 2011 at 18:25, Shu Zhang szh...@mediosystems.com wrote:
Hi, a node in my cassandra cluster
Aaron,
It looks like you're experiencing a side-effect of CASSANDRA-2083.
There was at least one place (when node B received updated schema from
node A) where gossip was not being updated with the correct schema
even though DatabaseDescriptor had the right version. I'm pretty sure
this is what
It is impossible to properly bootstrap a new node into a system where
there are not enough nodes to satisfy the replication factor. The
cluster as it stands doesn't contain all the data you are asking it to
replicate on the new node.
Gary.
On Thu, Jan 13, 2011 at 13:13, Mark Moseley
Funny you should mention that. I just put my half-baked solution to
this problem on github today.
https://github.com/gdusbabek/cassandra-maker. It generates
cassandra.yaml files (and entire config directories too) that are
based on the svn defaults. It should be easy to customize it to fit
your
0.6-0.7 will require a full cluster restart.
0.7-0.8 will require a rolling restart, so long as CASSANDRA-1015 is completed.
keyspace/cf definitions will be readable across major versions, or
there will be a way provided to migrate them if that is not possible.
Gary.
On Wed, Dec 1, 2010 at
Windows is notoriously bad about hanging on to file handles. Make
sure there are no explorer windows or command line windows open to
d:\cassandra\data\system\, and then hope for the best.
Gary.
On Mon, Nov 29, 2010 at 02:49, Ramon Rockx r.ro...@asknow.nl wrote:
Hi,
Recently I downloaded
Mostly these things: stored schema information, cached cluster info,
the token, hints. Everything but the hints can be replaced.
Gary.
On Mon, Nov 15, 2010 at 06:29, Utku Can Topçu u...@topcu.gen.tr wrote:
Hello All,
I'm wondering before restarting the a node in a cluster. If I delete the
You'll need to convert from storage-conf.xml to cassandra.yaml and
import your schema at some point. NEWS.txt outlines the general
approach (see Upgrading).
Gary.
On Tue, Nov 2, 2010 at 13:31, Erik Onnen eon...@gmail.com wrote:
Hello,
We're planning an upgrade from 0.6.7 (after it's released)
There's not a lot of useful information in that error.
Cassandra consumes the stack trace and any exceptions underneath that
cause the error instantiating the snitch. I've created
https://issues.apache.org/jira/browse/CASSANDRA-1682 so we can include
a full stack trace.
In the meantime, I'd say
The main difficulty is that row mutations are currently represented
only in terms of individual columns. This has implications in the way
the transaction is carried out and represented in the commit log.
Introducing deletable slices is doable, but keeping it within the
semantics of column family
On Wed, Oct 27, 2010 at 03:24, Arijit Mukherjee ariji...@gmail.com wrote:
Hi All
I've another related question.
I am using a stream of records of the form (A, B, n) where the pair
(A,B) can occur multiple times. For example, you could have the
following rset of records -
A, B, 2
P, Q, 5
On Wed, Oct 27, 2010 at 05:08, Utku Can Topçu u...@topcu.gen.tr wrote:
Hi,
For a columnfamily in a keyspace which has RF=3, I'm issuing writes with
ConsistencyLevel.ONE.
in the configuration I have:
- memtable_flush_after_mins : 30
- memtable_throughput_in_mb : 32
I'm writing to this
On Tue, Oct 26, 2010 at 14:56, Edward Capriolo edlinuxg...@gmail.com wrote:
On Tue, Oct 26, 2010 at 1:45 PM, Stu Hood stu.h...@rackspace.com wrote:
While the adding virtual tokens/nodes to Cassandra discussion is a good
one, there are a few factors that might delay (or remove?) the necessity
Can you produce a thread dump on the machine? kill -3 ought to do it.
JConsole can be your friend at a time like this too. It might be
painstaking, but you can check the CPU time used by each thread using
the java.lang.Threading mbean. There's an interesting jconsole plugin
that is supposed to
Pycassa should just take your long and do the right thing with it
(packing it into a binary string) before passing it off to thrift.
The system tests in the source (test/system/test_thrift_server.py)
will give you a very good indication of how to do this. The long is
packed into a string using
If you're not seeing the NullPointerException at this point, things
are probably good. These messages are expected when logging at DEBUG.
Gary.
On Tue, Oct 12, 2010 at 02:35, J T jt4websi...@googlemail.com wrote:
I rinsed repeated after updating to the latest trunk version and checking
if
Looks like a bug with hinted-handoff. Will you file a ticket?
Gary
On Tue, Oct 12, 2010 at 15:51, Michael Moores mmoo...@real.com wrote:
I have a cluster of 8 nodes with a replication factor of 3 and consistency of
QUORUM.
When I stop one node in the cluster I end up with socket read
On Mon, Oct 11, 2010 at 03:41, Chen Xinli chen.d...@gmail.com wrote:
Hi,
We have a cassandra cluster of 6 nodes with RF=3, read-repair enabled,
hinted handoff disabled, WRITE with QUORUM, READ with ONE.
we want to rely on read-repair totally for node failure, as returning
inconsistent result
On Mon, Oct 11, 2010 at 04:01, Arijit Mukherjee ariji...@gmail.com wrote:
Hi All
I've just started reading about Cassandra and writing simple tests
using Cassandra 0.6.5 to see if we can use it for our product.
I have a data store with a set of columns, like C1, C2, C3, and C4,
but the
It should work this way:
1. Move your data to the new node (scp, etc.)
2. Make sure the new node is configured to use the same token as the new node.
3. Stand up the new node.
4. Turn off the old node.
If your environment is volatile, it's probably best to run `nodetool
repair` on the new node.
We have a system test that tests this (in avro python). see
test/system/test_avro_standard.py:TestStandardOperations.test_multiget_slice_simple.
On Wed, Sep 29, 2010 at 01:06, Gabor Torok gabor.to...@sunpowercorp.com wrote:
Hi,
I'm attempting to use avro to talk to cassandra because the ruby
On Mon, Sep 20, 2010 at 09:51, shimi shim...@gmail.com wrote:
I have a cluster with 6 nodes on 2 datacenters (3 on each datacenter).
I replaced all of the servers in the cluster (0.6.4) with new ones (0.6.5).
My old cluster was unbalanced since I was using Random Partitioner and I
bootstrapped
On Mon, Sep 20, 2010 at 10:02, Rodrigo Hjort rodrigo.hj...@gmail.com wrote:
Hello all,
In order to build a Cassandra cluster exclusively for availability and
replication testings, I thought of a simple solution, based on a single
Linux instance, with no virtualization at all.
The idea was
I discovered some problems with the fat client earlier this week when
I tried using it. It needs some fixes to keep up with all the 0.7
changes.
Gary.
On Thu, Sep 16, 2010 at 05:48, Asif Jan asif@gmail.com wrote:
Hi
I am using 0.7.0-beta1 , and trying to get the contrib/client_only
beta-2 will include the ability to set these values and others. Look
for the system_update_column_family() and system_update_keyspace()
methods.
Gary.
On Thu, Sep 16, 2010 at 02:38, Marc Canaleta mcanal...@gmail.com wrote:
Hi!
I like the new feature of making live schema updates. You can add,
On Wed, Sep 15, 2010 at 09:17, Sandor Molnar smol...@kinamik.com wrote:
Hello guys!
I just started researching today whether we can use Cassandra in our software
or not and I need to know if it is possible to use embedded Cassandra in
Jboss somehow. I googled it and I found several pages
On Tue, Sep 7, 2010 at 17:42, kannan chandrasekaran ckanna...@yahoo.com wrote:
Hi All,
We are currently considering Cassandra for our application.
Platform:
* a single-node cluster.
* windows '08
* 64-bit jvm
For the sake of brevity let,
Cassandra service = a single node cassandra
Is it possible this was a new node with a manual token and
autobootstrap turned off?
If not, could you give more details about the node?
Gary.
On Fri, Aug 27, 2010 at 17:58, B. Todd Burruss bburr...@real.com wrote:
i got the latest code this morning. i'm testing with 0.7
ERROR
If you're only interested in accessing data natively, I suggest you
try the fat client. It brings up a node that participates in
gossip, exposes the StorageProxy API, but does not receive a token and
so does not have storage responsibilities.
StorageService.instance.initClient();
in 0.7 you
It looks like you're running into
https://issues.apache.org/jira/browse/CASSANDRA-1403, which was fixed
last week and will be included in beta2.
If you are experiencing this on trunk, please do file another ticket,
or comment on the existing one.
Gary.
On Mon, Aug 23, 2010 at 13:33, B. Todd
that the
cluster is quiescent before sending schema updates to a random node.
Gary.
On Mon, Aug 23, 2010 at 14:03, Gary Dusbabek gdusba...@gmail.com wrote:
It looks like you're running into
https://issues.apache.org/jira/browse/CASSANDRA-1403, which was fixed
last week and will be included in beta2
On Thu, Aug 19, 2010 at 16:30, Alaa Zubaidi alaa.zuba...@pdf.com wrote:
Hi,
I am trying to run Cassandra 0.7 and I am getting different errors: First it
was while calling client.insert and now while calling set_keyspace (see
below).
Note: I get the following when I start Cassandra:
It is coming. In fact, I started working on this ticket yesterday.
Most of the settings that you could change before will be modifiable.
Unfortunately, you must still manually perform the repair operations,
etc., afterward.
https://issues.apache.org/jira/browse/CASSANDRA-1285
Gary.
On Thu,
Yes. definitely open a ticket.
Gary
On Mon, Aug 16, 2010 at 20:05, Arya Goudarzi agouda...@gaiaonline.com wrote:
While inserting into a 3 node cluster, one of the nodes got this exception in
its log:
ERROR [MIGRATION-STAGE:1] 2010-08-16 17:46:24,090 CassandraDaemon.java (line
82) Uncaught
Should we close https://issues.apache.org/jira/browse/CASSANDRA-653
then? Fetching a count of all rows is just a specific instance of
fetching the count of a range or rows.
I spoke to a programmer at the summit who was working on this ticket
mainly as a way of getting familiar with the codebase.
You should take a look at http://wiki.apache.org/cassandra/LiveSchemaUpdates
loadSchemaFromYaml() is intended to initialize the schema on a seed
node in a new cluster (or one that has been upgraded from 0.6). It is
an operation that should only be performed one time *per cluster.*
Gary
On Wed,
On Sun, Aug 8, 2010 at 07:21, Carsten Krebs carsten.kr...@gmx.net wrote:
I'm wondering why a TokenRange returned by describe_ring(keyspace) of the
thrift API just returns endpoints consisting only of an address but omits any
port information?
My first thought was, this method could be used
On Thu, Aug 5, 2010 at 14:59, Zhong Li z...@voxeo.com wrote:
All,
Thanks for Apache Cassandra Project, it is great project.
This is my first time to use it. We install it on 10 nodes and runs great.
The 10 nodes cross all 5 datacenters around the world.
The big thing bother me is initial
NullPointerException--it sounds like you're restarting?
If so, you should look into `nodetool drain`.
http://wiki.apache.org/cassandra/FAQ#modify_cf_config
Gary
On Wed, Aug 4, 2010 at 03:27, David Boxenhorn da...@lookin2.com wrote:
When I change schema I need to delete the commit logs -
The vote is in process.
http://permalink.gmane.org/gmane.comp.db.cassandra.devel/2010
Gary.
On Thu, Jul 29, 2010 at 11:34, B. Todd Burruss bburr...@real.com wrote:
i see a 0.6.4 tag in SVN, but not on cassandra's download page. is this
ready for use if building from SVN?
On Wed, Jul 21, 2010 at 14:14, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
Sure, looks like that's in 0.6.4, so I'll probably just rebuild my server
based on the 0.6 branch, unless you want me to test just the patch for
1221? Most likely won't get a chance to try until tomorrow, so let
Anthony,
I think you're seeing the results of CASSANDRA-1221. Each node has
two connections with its peers. One connection is used for gossip,
the other for exchanging commands. What you see with 1221 is the
command socket getting 'stuck' after a peer is convicted by gossip and
then recovers.
Defining at runtime is, very intentionally, an absolute must. It
would have been very simple and perhaps user-friendly to add a flag
that loads the schema specified in yaml when cassandra starts up. I
decided against it when implementing the feature because I figured it
would have been a
Arya,
That is not currently possible in trunk. It would be a good feature
though. Care to file a ticket?
Gary.
On Thu, Jul 15, 2010 at 22:13, Arya Goudarzi agouda...@gaiaonline.com wrote:
I recall jbellis in his training showing us how to increase the replication
factor and repair data on
Did you add a new node to the cluster at the time you restarted it?
If not, I would think that each node already had a token that would
make such a collision impossible, unless we have a new bug to
troubleshoot.
Gary.
On Wed, Jul 14, 2010 at 20:46, Mubarak Seyed mubarak.se...@gmail.com wrote:
See CASSANDRA-293 and CASSANDRA-494.
Key-range updates touch multiple rows and cannot be performed
atomically, so the consistency promise you get would be the same as
with batch_mutate. Another other problem is that the update needs to
be sent to *any* node that is responsible for part of the
On Tue, Jun 22, 2010 at 20:16, Arya Goudarzi agouda...@gaiaonline.com wrote:
Hi,
Please confirm if this is an issue and should be reported or I am doing
something wrong. I could not find anything relevant on JIRA:
Playing with 0.7 nightly (today's build), I setup a 3 node cluster this way:
On Tue, Jun 22, 2010 at 09:59, David Boxenhorn da...@lookin2.com wrote:
In my system, I have a Cassandra front end, and an Oracle back end. Some
information is created in the back end, and pushed out to the front end, and
some information is created in the front end and pulled into the back
*Hopefully* fixed. I was never able to duplicate the problem on my
workstation, but I had a pretty good idea what was causing the
problem. Julie, if you're in a position to apply and test the fix, it
would help help us make sure we've got this one nailed down.
Gary.
On Thu, Jun 17, 2010 at
This question has been coming up quite regularly now. I've added an
entry to the FAQ. Please feel free to expand an clarify.
http://wiki.apache.org/cassandra/FAQ#batch_mutate_atomic
Gary.
On Mon, Jun 14, 2010 at 06:43, Ran Tavory ran...@gmail.com wrote:
no, it's not atomic. it just shortens
On Fri, Jun 11, 2010 at 10:14, Julie julie.su...@nextcentury.com wrote:
Ran Tavory rantav at gmail.com writes:
I can't say exactly how much memory is the correct amount, but surely 1G is
very little. By replicating 3 times your cluster now makes 3 times more work
than it used to do, both on
notification (we are talking about 5 rows in 1 cf). Thrift port is not
available for ~30 min. Why is that? I would expect it to be back in a matter
of maybe 1' (this should be data quantity related).
Thanks, Stephan
-Original Message-
From: Gary Dusbabek [mailto:gdusba...@gmail.com
Chris,
Can you get me a stack dump of one of the busy nodes (kill -3)?
Gary
On Thu, Jun 3, 2010 at 22:50, Chris Goffinet goffi...@digg.com wrote:
We're seeing this as well. We were testing with a 40+ node cluster on the
latest 0.6 branch from few days ago.
-Chris
On Jun 3, 2010, at 9:55
Are you running ant test? It defaults to setting memory to 1G. If
you're running them outside of ant, you'll need to set max memory
manually.
Gary.
On Thu, Jun 3, 2010 at 10:35, Lev Stesin lev.ste...@gmail.com wrote:
Hi,
I am getting OOM during load tests:
java.lang.OutOfMemoryError: Java
,
Is there a directive to set it? Or should I modify the cassandra
script itself? Thanks.
Lev.
On Thu, Jun 3, 2010 at 10:48 AM, Gary Dusbabek gdusba...@gmail.com wrote:
Are you running ant test? It defaults to setting memory to 1G. If
you're running them outside of ant, you'll need to set max memory
Your replication factor is only set to 1, which means that each key
will only live on a single node. If you do wait for bootstrapping to
commence (takes 90s in trunk, I don't recall in 0.6), you should see
some keys moving unless your inserts were all into a small range.
Perhaps your being
I was able to reproduce the error by staring up a node using
RandomPartioner, kill it, switch to OrderPreservingPartitioner,
restart, kill, switch back to RandomPartitioner, BANG!
So it looks like you tinkered with the partitioner at some point.
This has the unfortunate effect of corrupting your
If I had to guess, I'd say that something at the transport layer had
trouble. Possibly some kind of thrift hiccup that we haven't seen
before.
Your description makes it sound as if the decommission is proceeding
normally though.
Gary.
On Tue, May 18, 2010 at 04:42, Ran Tavory ran...@gmail.com
We have get_count at the thrift level. You supply a predicate and it
returns the number of columns that match. There is also
multi_get_count, which is the same operation against multiple keys.
Gary.
On Thu, May 13, 2010 at 04:18, Bill de hOra b...@dehora.net wrote:
Admin question - is there
Cassandra has always enforced the tiniest bit of schema. You
basically define how you want your columns and subcolumns to be sorted
within column families. You also name the column families and
keyspaces. That's all though.
The part that is changing is that the keyspaces and column families
Yes--0.7. I aim to make it part of
https://issues.apache.org/jira/browse/CASSANDRA-494 (remove_slice).
Gary.
On Thu, May 13, 2010 at 16:08, B. Todd Burruss bburr...@real.com wrote:
i just figured out that can't do a batch mutate + deletion that uses a slice
range predicate. is adding this
You didn't give a lot of details about the remoteness of the remote
server. Remote hosts not be able to contact any host on the
192.168.*.* over the internet without routing support. If the remote
host is on the same network as the 192.168.*.* host, it should work
unless one of those hosts is
Yes. You need to edit the configuration of every machine in the cluster.
Gary.
On Wed, May 5, 2010 at 06:27, Yu-Chun Chang congo.ch...@gmail.com wrote:
Dear all,
I'm a starter for playing Cassandra. I've set up three machines (called
PC_A, PC_B, PC_C) and run them as a Cassandra cluster.
Martin,
Please create a ticket and include the relevant parts of your storage-conf.
To summarize, the output gives you the impression that bootstrap has
completed normally, but when you check, it appears to be hung on the
receiving nodes?
Do you mind turning debug on and and seeing if you can
On Sun, Apr 18, 2010 at 11:14, dir dir sikerasa...@gmail.com wrote:
Hi Gary,
The main reason is that the compaction operation (removing deleted
values) currently requires that an entire row be read into memory.
Thank you for your explanation. But I still do not understand what do you
mean.
On Sat, Apr 17, 2010 at 10:50, dir dir sikerasa...@gmail.com wrote:
What problems can’t it solve?
No flexible indices
No querying on non PK values
Not good for binary data (64mb) unless you chunck
Row contents must fit in available memory
Gary Dusbabek say: Row contents must fit
Ran,
It looks like you're seeing
https://issues.apache.org/jira/browse/CASSANDRA-866. It's fixed in
0.6.1.
Gary
On Thu, Apr 15, 2010 at 04:06, Ran Tavory ran...@gmail.com wrote:
When restarting one of the nodes in my cluster I found this error in the
log. What does this mean?
INFO [GC
the errors in the log I haven't seen any other
irregularities. (maybe there are, but they haven't surfaced). Does this
assertion mean data corruption or something else that's worth waiting to
0.6.1 for?
On Thu, Apr 15, 2010 at 2:00 PM, Gary Dusbabek gdusba...@gmail.com wrote:
Ran,
It looks like
You'll have to scan the CF. If you're using
OrderPreservingPartitioner please see 'get_range_slices'
(http://wiki.apache.org/cassandra/API). It would help if you had an
idea of where the key might be, so you would know where to start
scanning.
Gary.
On Thu, Apr 15, 2010 at 21:01, Jared Laprise
On Thu, Apr 8, 2010 at 02:55, Paul Prescod p...@ayogo.com wrote:
In this¹ debate, there seemed to be consensus on the following fact:
In Cassandra, say you use N=3, W=3 R=1. Let’s say you managed to
only write to replicas A B, but not C. In this case Cassandra will
return an error to the
AJ,
The wiki gives an outline of how to do this:
http://wiki.apache.org/cassandra/FAQ#modify_cf_config
Gary
On Thu, Apr 1, 2010 at 23:18, AJ Chen ajc...@web2express.org wrote:
when adding/changing a column to a column family for existing data in
cassandra, what's a good way to do it?
thanks,
Does the JMX StreamingService list any incoming/outgoing files/hosts
on the sending/receiving nodes?
Gary.
On Thu, Apr 1, 2010 at 10:26, Dan Di Spaltro dan.dispal...@gmail.com wrote:
So we are adding another node to the cluster with the latest 0.6 branch
(RC1). It seems to be hung in some
On Mon, Mar 22, 2010 at 01:58, Benjamin Black b...@b3k.us wrote:
Looking at db/SystemTable.java I see the use of Bootstrap as a token
during bootstrap, but it seems to be for the system table, not other
keyspaces. Is it used more generally than that or is this a bug?
I only see 'Bootstrap'
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