What you describe below sounds like what I want to do. I think that the only
additional thing I am requesting is to export the migrations from the dev
cluster (since Cassandra already has a table that saves them - I just want
that information!) so I can import it to the other clusters. This would
batch_mutate() and insert() follow the a similar execution path to a single
insert in the server. It's not like putting multiple statements in a
Transaction in the RDBMS.
Where they do differ is that you can provide multiple columns for a row in a
column family, and these will be applied as
I'd stick with the RandomPartitioner until you have a really good reason to
change :)
I'd also go with your alternative design with some possible tweaks.
Consider partitioning the rows by year or some other sensible value. If you
will generally be getting the most recent data this can reduce
Do all the lines have the same IP address or is that just how you redacted them
?
is the single node in DC1 the one you are moving?
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 16 May 2011, at 12:28, Anurag Gujral wrote:
a) No, the tokens and the endpoints are for the entire cluster. You can only
have one snitch per cluster, why do you want multiple ones?
b) That happens if the endpoint / node is not listed in the topology, add the
node to the topology first. created
Thanks Aaron, very useful. I'll give some of your suggestions a go...
On 16 May 2011 19:13, aaron morton aa...@thelastpickle.com wrote:
I'd stick with the RandomPartitioner until you have a really good reason to
change :)
I'd also go with your alternative design with some possible tweaks.
Environment : java 64 bit server, java client, thrift get_slice method,
Cassandra 0.7.4, single node
Depending on the data I pass for a query on a CF I get the following
listed below. Any suggestions what could be wrong based on the stack
trace?
java.lang.AssertionError
at
Hi everyone. I see in the logs that Concurrent Mark Sweep is taking 12
seconds to do its stuff. Is this normal? There is no stop-the-world GC,
it just takes 12 seconds.
Configuration: 0.7.5 , 8GB Heap, 16GB machines. 7 * 64 MB memtables.
Is there a way to view composite column names in the CLI?
Is there a way to input them (i.e. in the set command)?
Yes.
2011/5/16 Héctor Izquierdo Seliva izquie...@strands.com:
Hi everyone. I see in the logs that Concurrent Mark Sweep is taking 12
seconds to do its stuff. Is this normal? There is no stop-the-world GC,
it just takes 12 seconds.
Configuration: 0.7.5 , 8GB Heap, 16GB machines. 7 * 64 MB
All lines have different IP address,yes I am trying to move single node in
DC1
Thanks
Anurag
On Mon, May 16, 2011 at 3:19 AM, aaron morton aa...@thelastpickle.comwrote:
Do all the lines have the same IP address or is that just how you redacted
them ?
is the single node in DC1 the one you are
Thanks Aaron, really help!
2011/5/16 aaron morton aa...@thelastpickle.com
batch_mutate() and insert() follow the a similar execution path to a single
insert in the server. It's not like putting multiple statements in a
Transaction in the RDBMS.
Where they do differ is that you can provide
Hi, guys,
what happens if I have two threads or two processes, both of which need to
ask if some condition in Cassandra is fulfilled, and then, say, write the
data based on that. If one receives the no answer and decides to write,
but before he does, the other one receives the no answer and
In threading, you would do an atomic put if not present, is there such a
thing in Cassandra?
No. In general, one works to avoid the need for strong co-ordination.
If strong co-ordination is truly required, some external method is
required. Some people use ZooKeeper
Thank you for a quick answer - I could impress my colleagues at the meeting
:)
On Mon, May 16, 2011 at 2:54 PM, Peter Schuller peter.schul...@infidyne.com
wrote:
In threading, you would do an atomic put if not present, is there such
a
thing in Cassandra?
No. In general, one works to
The code is trying to follow the column index for a row in an sstable, but it
cannot skip as many bytes as it would like to to get to the column. Helpfully
the help says running out of bytes is only one of the reasons why this could
happen:)
Can you provide some more information about the
Hi,
Are you referring to the binary_memtable_throughput_in_mb which is a global
parameter or the per col fam specific memtable_throughput_in_mb? The former
is set to 256 and we dont override the default col fam specific value. Would
just re-setting the global binary_memtable_throughput_in_mb to
You can try to update column family using cassandra-cli. Try to set
memtable_throughput to 32 first.
[default@unknown] help update column family;
update column family Bar;
update column family Bar with att1=value1;
update column family Bar with att1=value1 and att2=value2...;
Update a column
Hi all,
We are trying to use MD5 encrypted passwords. Quick question first - Is
SHA-2 supported yet? US-CERT of the U. S. Department of Homeland Security
has said that MD5 should be considered cryptographically broken and
unsuitable for further use”, and SHA-2 family of hash functions is
By the way, just noticed a typo in my email below. I'm using the correct
keyspace name in all locations on the cluster... however in my examples
below, I used MyKeyspace in some spots and MDR in other spots, but in the
cluster I'm specifying the same keyspace name everywhere, so that's not the
Cassandra wouldn't know that the column name is composite of two different
things. So you could just request the column names and values for a specific
key like this and then just look at the column names that get returned:
[default@MyKeyspace] get DemoCF[ascii('key_42')];
= (column=CA_SanJose,
I understand that 0.8.0 has configurable internode encryption
(CASSANDRA-1567, 2152).
I haven't been able to find any info on how to configure it though on this
mailing list or the Datastax website.
Can somebody point me towards how to set this up?
- Sameer
Take a look at cassandra.yaml in your 0.8 download at the very bottom. There
are docs and examples there.
e.g.
http://svn.apache.org/repos/asf/cassandra/tags/cassandra-0.8.0-beta2/conf/cassandra.yaml
On May 16, 2011, at 6:36 PM, Sameer Farooqui wrote:
I understand that 0.8.0 has configurable
Hey guys,
I have updated all my column families with 32 as the memtable_throughput. I
will let you know how cassandra behaves.
Thanks!
On Mon, May 16, 2011 at 3:52 PM, mcasandra mohitanch...@gmail.com wrote:
You can try to update column family using cassandra-cli. Try to set
After I updated the memtable_throughput, I stopped all my writing processes.
I did a du /commitlog to find how much was cassandra commitlog at that time.
For the three nodes it was around 1.4G each.
I waited for about 30 minutes to see whether cassandra flushes things. When
I look at du now, it
Any interest for a Cassandra Hackathon evening in NYC? Any committer(s)
going to be in the NYC area together that can lead/guide this?
http://www.meetup.com/NYC-Cassandra-User-Group/events/18635801/
I have a thumbs up to use our office www.medialets.com in the Milk Studios
building. It is a big
I had it on our list of ideas for the Cassandra NYC meetup. I am down for
action.
On Mon, May 16, 2011 at 9:40 PM, Joseph Stein crypt...@gmail.com wrote:
Any interest for a Cassandra Hackathon evening in NYC? Any committer(s)
going to be in the NYC area together that can lead/guide this?
Its now almost 4 hours. I still see commitlogs worth 1.2G on the machines. I
see no activity
On Mon, May 16, 2011 at 6:33 PM, Sanjeev Kulkarni sanj...@locomatix.comwrote:
After I updated the memtable_throughput, I stopped all my writing
processes. I did a du /commitlog to find how much was
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