Hey
I want to do unit tests for software that uses Cassandra as storage
backend. Using the Hector client, I could just iterate over all
keyspaces and delete them. In CQL, there is no query to list all
keyspaces. How can I drop all Keyspaces from Cassandra, without knowing
every single Keyspace
To get a list of all keyspaces via CQL you can run:
*describe keyspaces *or *select keyspace_name from system.schema_keyspaces;*
On Wed, Apr 16, 2014 at 9:23 AM, Sebastian Schmidt isib...@gmail.comwrote:
Hey
I want to do unit tests for software that uses Cassandra as storage
backend. Using
Hi Rob,
thanks. How many nodes to you have running in those 5 racks and RF 5? Only 5
nodes or more?
Markus
Robert Coli rc...@eventbrite.com schrieb am 20:36 Dienstag, 15.April 2014:
On Tue, Apr 15, 2014 at 6:14 AM, Ken Hancock ken.hanc...@schange.com wrote:
Keep in mind if you lose the wrong
Thank you that worked!
Am 16.04.2014 10:46, schrieb Mark Reddy:
/select keyspace_name from system.schema_keyspaces;/
Hi,
I'm using a Cassandra table to store some data. I created the table like
this:
CREATE TABLE IF NOT EXISTS table_name (s BLOB, p BLOB, o BLOB, c BLOB,
PRIMARY KEY (s, p, o, c));
I need the at least the p column to be sorted, so that I can use it in a
WHERE clause. So as far as I understand,
I need to rebalance my cluster. I am sure this question has been asked
before -- will 1.2 continue to serve reads and writes correctly while
move is in progress ?
Need this for my sanity.
--
Regards,
Oleg Dulin
http://www.olegdulin.com
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 your cluster and app will function as designed.
Jonathan Lacefield
Solutions
Hello,
I've just upgraded to Cassandra 1.2.16. I've also started using the
CqlPagingInputFormat within my map/reduce tasks.
I have a question with regard to using CqlPagingInputFormat for paging
through wide rows. I don't see a way to input more than one column at a
time into my Mapper.
I
Hi,
Mine is a simple case. Running on single node only. Keyspace is:
create keyspace twitter with replication = {'class':'SimpleStrategy',
'replication_factor' : 3}
-Vivek
On Wed, Apr 16, 2014 at 1:27 AM, Tupshin Harper tups...@tupshin.com wrote:
Please provide your keyspace definition, and
create keyspace twitter with replication = {'class':'SimpleStrategy',
'replication_factor' : 3}
Your replication factor is your issue here, you have a single node and a
RF=3. For a single node setup your RF should be 1. You can find more info
about replication here:
That is entirely the problem.
By having one node, but RF=3, you have created this exact problem.
Each node can own, at most, one copy of each row of data, so the cluster
is treating this (correctly) as a degraded runtime environment where no
operation requiring CL 1 will always fail. LWT
Thanks Mark. does this mean with RF=3, all 3 nodes must be up and running
for CAS updates?
-Vivek
On Wed, Apr 16, 2014 at 6:22 PM, Mark Reddy mark.re...@boxever.com wrote:
create keyspace twitter with replication = {'class':'SimpleStrategy',
'replication_factor' : 3}
Your replication
No, but you do need a quorum of nodes.
http://www.datastax.com/documentation/cassandra/2.0/cassandra/dml/dml_config_consistency_c.html
SERIAL
A write must be written conditionally to the commit log and memory table on
a quorum of replica nodes.
Used to achievelinearizable
The Paxos protocol used for CAS operations will always use at least a
consistency level effectively equivalent to QUORUM (called SERIAL) when
writing, even if you explicitly specify a lower level, e.g. ANY or ONE.
Setting consistency level to ALL will make the write execute on all
replicas if the
Thanks Mark and Tuphsin.
So on single node, if i set consistency level to SERIAL and create a
keyspace with RF=1? Would that work?
-Vivek
On Wed, Apr 16, 2014 at 6:32 PM, Mark Reddy mark.re...@boxever.com wrote:
The Paxos protocol used for CAS operations will always use at least a
It will work for correctness, but give you a very inaccurate view of
performance,.
-Tupshin
On Apr 16, 2014 6:05 AM, Vivek Mishra mishra.v...@gmail.com wrote:
Thanks Mark and Tuphsin.
So on single node, if i set consistency level to SERIAL and create a
keyspace with RF=1? Would that work?
Thanks, i think got the point.CAS doesn't make much sense on single node.
-Vivek
On Wed, Apr 16, 2014 at 6:37 PM, Tupshin Harper tups...@tupshin.com wrote:
It will work for correctness, but give you a very inaccurate view of
performance,.
-Tupshin
On Apr 16, 2014 6:05 AM, Vivek Mishra
Hi,
I am trying to investigate ParNew promotion failures happening routinely in
production. As part of this exercise, I enabled
-XX:PrintHistogramBeforeFullGC and saw the following output. As you can see
there are a ton of Columns, ExpiringColumns and DeletedColumns before GC
ran and these
Do you delete and/or set TTLs on your data?
On Wed, Apr 16, 2014 at 2:14 PM, Ruchir Jha ruchir@gmail.com wrote:
Hi,
I am trying to investigate ParNew promotion failures happening routinely
in production. As part of this exercise, I enabled
-XX:PrintHistogramBeforeFullGC and saw the
No we don't.
Sent from my iPhone
On Apr 16, 2014, at 9:21 AM, Mark Reddy mark.re...@boxever.com wrote:
Do you delete and/or set TTLs on your data?
On Wed, Apr 16, 2014 at 2:14 PM, Ruchir Jha ruchir@gmail.com wrote:
Hi,
I am trying to investigate ParNew promotion failures
If you’re running unit tests and repeatadly clearing the Cassandra keyspaces,
you may want to check out Ferry (ferry.opencore.io). It lets you
standup/destroy multiple Cassandra stacks locally on your machine and is useful
for the use case you described. I’m the author of Ferry, and would be
You can take a heap dump and find out who has references to it. Can find out
more which column family they are from. Do you have a lot of tombstones or
have data thats over written a lot or and doing a ton of reads? Maybe wide rows
that your querying across or using filtering? Reads could
I'm running a cluster with Cassandra and my app embedded.
Regarding performance, it is better to run embedded Cassandra?
What are the implications of running an embedded Cassandra ?
Tks
--
Atenciosamente,
Sávio S. Teles de Oliveira
voice: +55 62 9136 6996
http://br.linkedin.com/in/savioteles
Is it advisable to run the embedded Cassandra in production?
2014-04-16 12:08 GMT-03:00 Sávio Teles savio.te...@lupa.inf.ufg.br:
I'm running a cluster with Cassandra and my app embedded.
Regarding performance, it is better to run embedded Cassandra?
What are the implications of running an
I think you might be seeing the issue reported in
https://issues.apache.org/jira/browse/CASSANDRA-6971
If that's the case, it looks like a fix will be in 2.0.7
Thanks,
Russ
On Tue, Apr 15, 2014 at 11:48 PM, Umut Kocasaraç ukocasa...@gmail.comwrote:
Hi Olek,
Could you solve the problem.
There will be a small performance improvement from not having the app-cluster
latency. If ran on same system (which I wouldn’t recommend) the latency would
be pretty irrelevant anyway unless you are fighting for sub millisecond latency
(in which case get off the JVM). You would be able to
Greetings,
How long does bootstrapping typically take? I have 3 existing nodes in our
cluster with about 40GB each. I've added three new nodes to the cluster.
They have been in bootstrap mode for a little over 3 days now. Should I be
concerned? Is there a way to tell how long it will take to
On Wed, Apr 16, 2014 at 11:10 AM, Phil Burress philburress...@gmail.comwrote:
How long does bootstrapping typically take? I have 3 existing nodes in our
cluster with about 40GB each. I've added three new nodes to the cluster.
They have been in bootstrap mode for a little over 3 days now.
Thanks very much for the response. I'm not using vnodes, does that matter?
On Wed, Apr 16, 2014 at 2:13 PM, Robert Coli rc...@eventbrite.com wrote:
On Wed, Apr 16, 2014 at 11:10 AM, Phil Burress
philburress...@gmail.comwrote:
How long does bootstrapping typically take? I have 3 existing
Also, one more quick question. For the new nodes, do I add all three
existing nodes as seeds? Or just add one?
On Wed, Apr 16, 2014 at 2:16 PM, Phil Burress philburress...@gmail.comwrote:
Thanks very much for the response. I'm not using vnodes, does that matter?
On Wed, Apr 16, 2014 at 2:13
Seed nodes don't bootstrap.
https://issues.apache.org/jira/browse/CASSANDRA-5836
On Wed, Apr 16, 2014 at 2:17 PM, Phil Burress philburress...@gmail.comwrote:
Also, one more quick question. For the new nodes, do I add all three
existing nodes as seeds? Or just add one?
On Wed, Apr 16,
Thanks Chris!
2014-04-16 12:53 GMT-03:00 Chris Lohfink clohf...@blackbirdit.com:
There will be a small performance improvement from not having the
app-cluster latency. If ran on same system (which I wouldn’t recommend)
the latency would be pretty irrelevant anyway unless you are fighting
On Wed, Apr 16, 2014 at 11:16 AM, Phil Burress philburress...@gmail.comwrote:
Thanks very much for the response. I'm not using vnodes, does that matter?
Not in your case. In some cases it is safe to bootstrap multiple nodes into
a cluster at once AT SPECIFIC TOKENS, because there is more than
Thanks!
On Wed, Apr 16, 2014 at 2:50 PM, Robert Coli rc...@eventbrite.com wrote:
On Wed, Apr 16, 2014 at 11:16 AM, Phil Burress
philburress...@gmail.comwrote:
Thanks very much for the response. I'm not using vnodes, does that
matter?
Not in your case. In some cases it is safe to
I've shut down two of the nodes and am bootstrapping one right now. Is
there any way to tell when it will finish bootstrapping?
On Wed, Apr 16, 2014 at 2:56 PM, Phil Burress philburress...@gmail.comwrote:
Thanks!
On Wed, Apr 16, 2014 at 2:50 PM, Robert Coli rc...@eventbrite.com wrote:
On
We are running into a reproducible issue in one of our cassandra clusters. We
are seeing that during an anti-entropy repair, if a particular sstable is
streaming to multiple endpoints and the two streams happen to hit the same
section of the sstable, it stalls all streams indefinitely on the
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
On Wed, Apr 16, 2014 at 3:17 PM, Andrew Cooper andrew.coo...@nisc.coopwrote:
We are running cassandra 1.2.5. I have checked through the change logs up
to 1.2.16 and do not see any indications of this being a known (and fixed)
issue.
Repair has been re-written in 2.0, because it was broken;
I have recently tested this scenario under a couple versions of Cassandra and
have been able to write and read to/from the cluster while performing a move.
I performed these tests utilizing an RF=2 on a three node cluster while
performing quorum reads and received no errors due to unavailable
First, thanks for the quick reply and jira links! Its helpful to know we are
not the only ones experiencing these issues.
Are you sure you actually want/need to run repair as frequently as you
currently are? Reducing the frequency won't make it work any better, but it
will reduce the number
After explicitly enabling port
9160 (Cassandra client port (Thrift)) in that particular node it's
connected to ring however other nodes are working with same configuration.
Now Opscenter is installed in that particular node after explicitly enabling
61620 (OpsCenter monitoring port), 61621
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