Hi,
Probably this question has been already asked in the mailing list, but I
couldn't find it.
The question is how to measure disk-space used by a keyspace, column family
wise, excluding snapshots?
best,
/Shahab
?!!!
does any have any idea how to do this?
best,
/Shahab
Hi,
This is probably a silly problem , but it is really serious for me. I have
a cluster of 3 nodes, with replication factor 2. But still I can not do a
simple "select count(*) from ..." neither using DevCenter nor "cqlsh" .
Any idea how this can be done?
best,
/Shahab
ource/example that I can look at ?
best,
/Shahab
QL 3
best,
/Shahab
On Wed, Sep 24, 2014 at 1:49 PM, DuyHai Doan wrote:
> Dynamic thing in Thrift ≈ clustering columns in CQL
>
> Can you give more details about your data model ?
>
> On Wed, Sep 24, 2014 at 1:11 PM, shahab wrote:
>
>> Hi,
>>
>> I would like to de
s outdated, there is an output parameter
"partition_rate" which is not explained in documentation?
best,
/Shahab
s outdated, there is an output parameter
"partition_rate" which is not explained in documentation?
best,
/Shahab
there any way to change the default value?
thanks
/Shahab
Thanks Shane.
best,
/Shahab
On Fri, Oct 3, 2014 at 6:51 PM, Shane Hansen wrote:
> It appears to be configurable in cassandra.yaml
> using batch_size_warn_threshold
>
> https://issues.apache.org/jira/browse/CASSANDRA-6487
>
>
> On Fri, Oct 3, 2014 at 10:47 AM, shahab wrote
ague
documentation there. I do appreciate of any one could help me to understand
the output of Stress-Tool?
BTW, I have already seen this one (but still the documentation is quite
poor):
http://www.datastax.com/documentation/cassandra/2.1/cassandra/tools/toolsCStressOutput_c.html
best,
/Shahab
with large size?
best,
/Shahab
On Sun, Oct 5, 2014 at 6:03 PM, Jens Rantil wrote:
> Shabab,
> If you are hitting this limit because you are inserting a lot of (CQL)
> rows in a single batch I suggest you split the statement up in multiple
> smaller batches. Generally, large inserts l
Thanks Jens for the comments.
As I am trying "cassandra stress tool", does it mean that the tool is
executing batch of "Insert" statements (probably hundreds, or thousands)
to the cassandra (for the sake of stressing Cassnadra ?
best,
/Shahab
On Wed, Oct 22, 2014 at 8:14 PM
OK, Thanks again Jens.
best,
/Shahab
On Thu, Oct 23, 2014 at 1:22 PM, Jens Rantil wrote:
> Hi again Shabab,
>
> Yes, it seems that way. I have no experience with the “cassandra stress
> tool”, but wouldn’t be surprised if the batch size could be tweaked.
>
> Cheers,
> Jen
Thanks Tyler for sharing this. It is exactly what I was looking for to know.
best,
/Shahab
On Thu, Oct 23, 2014 at 5:37 PM, Tyler Hobbs wrote:
> CASSANDRA-8091 (Stress tool creates too large batches) is relevant:
> https://issues.apache.org/jira/browse/CASSANDRA-8091
>
> On Thu,
n results.
Any idea what I am missing in my settings, or... ?
thanks,
/Shahab
I am using Calliope cassandra-spark connector(
http://tuplejump.github.io/calliope/), which is quite handy and easy to use!
The only problem is that it is a bit outdates , works with Spark 1.1.0,
hopefully new version comes soon.
best,
/Shahab
On Wed, Feb 11, 2015 at 2:51 PM, Marcelo Valle
312; Par Eden Space:
167712624 -> 0; Par Survivor Space: 0 -> 20970080
Is above line is indication of something that need to be fixed in the
system?? how can I resolve this?
best,
/Shahab
)..." using Datastax DevCenter GUI, but I
got same result.
I am sure that I have missed something or misunderstood how Cassandra
works, but don't know really what? I do appreciate any hints.
best,
/Shahab
AND
memtable_flush_period_in_ms=0 AND
compaction={'class': 'SizeTieredCompactionStrategy'} AND
compression={'sstable_compression': 'LZ4Compressor'};
On Tue, Mar 25, 2014 at 4:58 PM, Michael Shuler wrote:
> On 03/25/2014 10:36 AM, shahab wrote:
>
>> In our applicatio
Thanks for the hints. I got a better picture of how to deal with "count"
queries.
On Tue, Mar 25, 2014 at 7:01 PM, Robert Coli wrote:
> On Tue, Mar 25, 2014 at 8:36 AM, shahab wrote:
>
>> But after iteration 8, (i.e. inserting 150 sensor data), the
>> "
and
thus you can run complex ML algorithms relatively faster.
I think we just discussed this a short while ago when similar question
(storm vs. spark, I think) was raised by you earlier. Here is the link for
that discussion:
http://markmail.org/message/lc4icuw4hobul6oh
Regards,
Shahab
On Sat
Interesting approach Oded.
Is this something similar that has been described here:
http://radar.oreilly.com/2014/07/questioning-the-lambda-architecture.html
Regards,
Shahab
On Sun, Apr 26, 2015 at 4:29 AM, Peer, Oded wrote:
> I would maintain two tables.
>
> An “archive” table that
e solution? What harm in it? Also, you can slightly
change it, (if applicable) and not populate as a separate batch process but
in fact make part of your analysis job? Kind of a pre-process/prep step?
Regards,
Shahab
On Wed, Jun 3, 2015 at 10:48 AM, Matthew Johnson
wrote:
> Hi all,
>
>
Nate,
(slightly OT), what client API/library is recommended now that Hector is
sunsetting? Thanks.
Regards,
Shahab
On Wed, Nov 13, 2013 at 9:28 AM, Nate McCall wrote:
> You basically want option (c). Option (d) might work, but you would be
> bending the paradigm a bit, IMO. Certainly
Thanks Eric for the detailed explanation but can you point to a source or
document for this restriction in CQL3 tables? Doesn't it take away the main
feature of the NoSQL store? Or am I am missing something obvious here?
Regards,
Shahab
On Tue, Jun 4, 2013 at 2:12 PM, Eric Stevens wrote:
Thanks Eric. Yeah, I was asking about the second limitation (about dynamic
columns) and you have explained it well along with pointers to read further.
Regards,
Shahab
On Wed, Jun 5, 2013 at 8:18 AM, Eric Stevens wrote:
> I mentioned a few limitations, so I'm not sure which you
Though, I am a newbie bust just had a thought regarding your question 'How
will it handle requests for data which unavailable?', wouldn't the data be
served in that case from other nodes where it has been replicated?
Regards,
Shahab
On Wed, Jun 5, 2013 at 5:32 AM, Christo
Dynamic columns are not supported in CQL3. We just had a discussion a day
or two ago about this where Eric Stevens explained it. Please see this:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/CQL-3-returning-duplicate-keys-td7588181.html
Regards,
Shahab
On Thu, Jun 6, 2013 at
Hello,
Can anyone suggest a good/popular Unit Test tools/frameworks/utilities out
there for unit testing Cassandra stores? I am looking for testing from
performance/load and monitoring perspective. I am using 1.2.
Thanks a lot.
Regards,
Shahab
Hello Arthur,
What do you mean by "The queries need to be lightened"?
Thanks,
Shahb
On Tue, Jun 18, 2013 at 8:47 PM, Arthur Zubarev wrote:
> Cem hi,
>
> as per http://wiki.apache.org/cassandra/FAQ#dropped_messages
>
>
> Internode messages which are received by a node, but do not get not to b
e for now.
I do see some stuff out there but wanted to know recommendations from the
community given their experience.
Regards,
Shahab
On Wed, Jun 19, 2013 at 3:15 AM, Stephen Connolly <
stephen.alan.conno...@gmail.com> wrote:
> Unit testing means testing in isolation the smallest
Thanks Edward, Ben and Dean for the pointers. Yes, I am using Java and
these sounds promising for unit testing, at least.
Regards,
Shahab
On Wed, Jun 19, 2013 at 9:58 AM, Edward Capriolo wrote:
> You really do not need much in java you can use the embedded server.
> Hector wrap a simple
Have you seen this?
http://www.datastax.com/dev/blog/cassandra-file-system-design
Regards,
Shahab
On Thu, Jun 20, 2013 at 3:17 PM, Kanwar Sangha wrote:
> Hi – What is the block size for Cassandra ? is it taken from the OS
> defaults ?
>
hile
developing with) Cassandra unlike Hadoop.
Regards,
Shahab
On Thu, Jun 20, 2013 at 3:38 PM, Kanwar Sangha wrote:
> Yes. Is that not specific to hadoop with CFS ? I want to know that If I
> have a data in column of size 500KB, how many IOPS are needed to read that
> ? (assum
hanks.
Regards,
Shahab
On Friday, June 28, 2013, aaron morton wrote:
> As far as I know in 1.2 coordinator logs request before it updates
> replicas.
>
> You may be thinking about atomic batches, which are enabled by default for
> 1.2 via CQL but must be supported by Thrift clients.
n this one column1 or value using the
'SELECT' statement.
The OpsCenter on the other hand, displays multiple columns as
expected. Basically the demarcation of multiple columns i clearer.
Thanks a lot.
Regards,
Shahab
Thanks Eric for the explanation.
Regards,
Shahab
On Fri, Jul 12, 2013 at 11:13 AM, Shahab Yunus wrote:
> A basic question and it seems that I have a gap in my understanding.
>
> I have a simple table in Cassandra with multiple column families. I add
> new columns to each of
Aaron Morton can confirm but I think one problem could be that to create an
index on a field with small number of possible values is not good.
Regards,
Shahab
On Sat, Jul 13, 2013 at 9:14 AM, Tristan Seligmann
wrote:
> On Fri, Jul 12, 2013 at 10:38 AM, aaron morton wrote:
>
>> CRE
aries with
the client API that I am using?
Thanks a lot.
Regards,
Shahab
I think the former is for client communication to the nodes and the latter
for communication between nodes themselves as evident by the name of the
property. Please feel free to correct me if I am wrong.
Regards,
Shahab
On Saturday, July 20, 2013, Mohammad Hajjat wrote:
> Hi,
>
> W
Thanks for you replies.
Regards,
Shahab
On Sun, Jul 21, 2013 at 4:49 PM, aaron morton wrote:
> Give the app the same nodes you have in the seed lists.
>
> Cheers
>
> -
> Aaron Morton
> Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http:
Rahul,
See this as it was discussed earlier:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Representation-of-dynamically-added-columns-in-table-column-family-schema-using-cqlsh-td7588997.html
Regards,
Shahab
On Tue, Jul 23, 2013 at 2:51 PM, Rahul Gupta wrote:
> I am us
See this as this was discussed earlier:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Representation-of-dynamically-added-columns-in-table-column-family-schema-using-cqlsh-td7588997.html
Regards,
Shahab
On Fri, Jul 12, 2013 at 11:13 AM, Shahab Yunus wrote:
> A basic quest
tune
parameters.
Regards,
Shahab
On Wed, Jul 24, 2013 at 10:33 AM, Jan Algermissen <
jan.algermis...@nordsc.com> wrote:
> Hi,
>
> I am Jan Algermissen (REST-head, freelance programmer/consultant) and
> Cassandra-newbie.
>
> I am looking at Cassandra for an application I a
Hi Jan,
One question...you say
"- I must make sure the disks are directly attached, to prevent
problems when multiple nodes flush the commit log at the
same time"
What do you mean by that?
Thanks,
Shahab
On Wed, Jul 31, 2013 at 3:10 AM, Jan Algermissen wrote:
> Jon,
>
Hi Robert,
Can you shed some more light (or point towards some other resource) that
why you think built-in Secondary Indexes should not be used easily or
without much consideration? Thanks.
Regards,
Shahab
On Thu, Aug 1, 2013 at 3:53 PM, Robert Coli wrote:
> On Thu, Aug 1, 2013 at 12:49
Thanks a lot.
Regards,
Shahab
On Thu, Aug 1, 2013 at 8:32 PM, Robert Coli wrote:
> On Thu, Aug 1, 2013 at 2:34 PM, Shahab Yunus wrote:
>
>> Can you shed some more light (or point towards some other resource) that
>> why you think built-in Secondary Indexes should not
://www.datastax.com/documentation/cassandra/1.2/webhelp/index.html?pagename=docs&version=1.2&file=#cassandra/dml/dml_about_reads_c.html
http://www.roman10.net/how-apache-cassandra-read-works/
http://wiki.apache.org/cassandra/ArchitectureInternals
Regards,
Shahab
On Fri, Sep 6, 2013 at 6:28 AM,
Also, Sylvain, you have couple of great posts about relationships between
CQL3/Thrift entities and naming issues:
http://www.datastax.com/dev/blog/cql3-for-cassandra-experts
http://www.datastax.com/dev/blog/thrift-to-cql3
I always refer to them when I get confuse :)
Regards,
Shahab
On Fri
.
Data size? Writing speed (whether write heavy usecases or not)? Random ead
use-cases? column family design/how we store data?
Any pointers, documents, guidance, advise would be appreciated.
Thanks a lot.
Regards,
Shahab
s no difference whether we
use physical or VMs (in cloud)?
Regards,
Shahab
On Wed, Sep 11, 2013 at 7:34 PM, Aaron Turner wrote:
> Physical machines unless you're running your cluster in the cloud
> (AWS/etc).
>
> Reason is simple: Look how Cassandra scales and provides red
ore columns at a
time.
Regards,
Shahab
On Thu, Sep 12, 2013 at 1:51 AM, Aaron Turner wrote:
>
>
>
>
> On Wed, Sep 11, 2013 at 4:40 PM, Shahab Yunus wrote:
>
>> Thanks Aaron for the reply. Yes, VMs or the nodes will be in cloud if we
>> don't go the phys
Have you tried specifying your hostname (not localhost) in cassandra.yaml
and start it?
Regards,
Shahab
On Tue, Sep 17, 2013 at 8:39 AM, pradeep kumar wrote:
> I am very new to cassandra. Just started exploring.
>
> I am running a single node cassandra server & facing a prob
SSTable? I am also interesting in knowing the answer.
Regards,
Shahab
On Tue, Sep 17, 2013 at 9:50 AM, java8964 java8964 wrote:
> Thanks Dean for clarification.
>
> But if I put hundreds of megabyte data of one row through one put, what
> you mean is Cassandra will put all of them into
Thanks Robert for the answer. It makes sense. If that happens then it means
that your design or use case needs some rework ;)
Regards,
Shahab
On Tue, Sep 17, 2013 at 2:37 PM, java8964 java8964 wrote:
> Another question related to the SSTable files generated in the incremental
> backup
temperature' or
'temprature'? You are using the latter in your code and if it is not what
is in the data then you might be trying to parse empty or malformed string.
Regards,
Shahab
On Sat, Oct 5, 2013 at 5:16 AM, Anseh Danesh wrote:
> Hi all... I have a question. in the cassandr
Yes you can:
http://hbase.apache.org/book/regions.arch.html#compaction
http://hbase.apache.org/book/important_configurations.html (Managed
Compaction section)
Regards,
Shahab
On Sat, Oct 5, 2013 at 6:02 PM, Sebastian Schmidt wrote:
> Am 06.10.2013 00:00, schrieb Cem Cayiroglu:
> > I
tool
Regards,
Shahab
On Sat, Oct 5, 2013 at 7:06 PM, Shahab Yunus wrote:
> Yes you can:
>
> http://hbase.apache.org/book/regions.arch.html#compaction
> http://hbase.apache.org/book/important_configurations.html (Managed
> Compaction section)
>
> Regards,
> Shahab
I might be missing something obvious here but can't you afford (time-wise)
to run cleanup or repair after the deletion so that the deleted data is
gone? Assuming that your columns are time-based data?
Regards,
Shahab
On Wed, Oct 9, 2013 at 10:35 AM, Ravikumar Govindarajan <
ravikumar.g
Ahh, yes, 'compaction'. I blanked out while mentioning repair and cleanup.
That is in fact what needs to be done first and what I meant. Thanks
Robert.
Regards,
Shahab
On Wed, Oct 9, 2013 at 1:50 PM, Robert Coli wrote:
> On Wed, Oct 9, 2013 at 7:35 AM, Ravikumar
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