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Leonid Ilyevsky
Moon Capital Management, LP
499 Park Avenue
New York, NY 10022
P: (212) 652-4586
F: (212) 652-4501
E: lilyev...@mooncapital.com
[cid:image001.png@01CDF3EE.E9EA60F0]
This email, along with any attachments, is confidential and may be legally
Now I got tired of this, so I cleaned up everything and started from the empty
keyspace. Everything is ok so far.
How can I prevent this from happening in the future?
-Original Message-
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Tuesday, July 31, 2012 3:11 PM
To
ady.
I am positive that my data is corrupted in some way, so the question is, how do
I repair it.
-Original Message-----
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Tuesday, July 31, 2012 2:55 PM
To: 'user@cassandra.apache.org'
Subject: RE: Cannot create CF in Ca
/DataModel/ for cassandra datamodel.
Also, the flushing events are expected.
For example
run "create keyspace "
, "use "
, "create column family "
This should work with default settings..
On Tue, Jul 31, 2012 at 11:34 PM, Leonid Ilyevsky
wrote:
> My cassandra
My cassandra used to work fine, now it does not create a table. No error
message, but the table is not there. I execute "create table" statement many
times, the same thing. When I do it, I see in the system.log the the lines
below.
What can be the problem?
Pre-history: before I noticed it is bro
I have a question about efficiency of updates to a CF with composite key.
Let say I have 100 of logical rows to update, and they all belong to the same
physical wide row. In my naïve understanding (correct me if I am wrong), in
order to update a logical row, Cassandra has to retrieve the whole p
I am loading a large set of data into a CF with composite key. The load is
going pretty slow, hundreds or even thousands times slower than it would do in
RDBMS.
I have a choice of how granular my physical key (the first component of the
primary key) is, this way I can balance between smaller row
NSERT ...;
...
APPLY BATCH;
If you want to that from java, you will want to look at the jdbc
driver (http://code.google.com/a/apache-extras.org/p/cassandra-jdbc/),
though I don't know what is the status of the support for CQL3.
On Wed, Jul 11, 2012 at 2:18 PM, Leonid Ilyevsky
wrote:
> Is it OK to
, just to see if it works at all.
From: Derek Williams [mailto:de...@fyrie.net]
Sent: Tuesday, July 10, 2012 7:19 PM
To: user@cassandra.apache.org
Subject: Re: help using org.apache.cassandra.cql3
On Tue, Jul 10, 2012 at 3:04 PM, Leonid Ilyevsky
mailto:lilyev...@mooncapital.com>> wrote:
I am
I am trying to use the org.apache.cassandra.cql3 package. Having problem
connecting to the server using ClientState.
I was not sure what to put in the credentials map (I did not set any
users/passwords on my server), so I tried setting empty strings for "username"
and "password", setting them to
I see now there is a package org.apache.cassandra.cql3.statements, with
BatchStatement class. Is this what I should use?
-Original Message-
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Tuesday, July 10, 2012 11:45 AM
To: user@cassandra.apache.org
Subject: RE: Dynamic CF
-Original Message-
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Tuesday, July 10, 2012 10:37 AM
To: user@cassandra.apache.org
Subject: Re: Dynamic CF
On Tue, Jul 10, 2012 at 4:17 PM, Leonid Ilyevsky
wrote:
> So I guess, in the batch_mutate call, in the map t
waiting for your confirmation, I am going to try it.
-Original Message-
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Tuesday, July 10, 2012 8:24 AM
To: user@cassandra.apache.org
Subject: Re: Dynamic CF
On Fri, Jul 6, 2012 at 10:49 PM, Leonid Ilyevsky
wrote:
> At this poin
:58 PM
To: user@cassandra.apache.org
Subject: Re: Dynamic CF
On Fri, Jul 6, 2012 at 2:49 PM, Leonid Ilyevsky
mailto:lilyev...@mooncapital.com>> wrote:
At this point I am really confused about what direction Cassandra is going. CQL
3 has the benefit of composite keys, but no dynamic colu
hat batch_mutate would not support composite key.
Then I thought of making wide rows, so I store many quotes in one row (few
thousand). For this I really need dynamic table.
I would appreciate any useful suggestion.
-Original Message-----
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.c
validation'.
http://www.datastax.com/docs/1.0/references/cql/index#cql-column-family-storage-parameters
On Jul 6, 2012, at 2:13 PM, Leonid Ilyevsky wrote:
> Can I create a dynamic Cf using cql3? What is the syntax?
>
> Here is what I tried:
>
>
> cqlsh:test> create tabl
Can I create a dynamic Cf using cql3? What is the syntax?
Here is what I tried:
cqlsh:test> create table mytest (
... asset ascii, datetime int, count int, primary key(asset, datetime) )
... with default_validation_class = double;
Bad Request: default_validation_class is not a v
is: what is the required format of the key buffer?
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Friday, July 06, 2012 10:05 AM
To: 'user@cassandra.apache.org'
Subject: RE: Composite key in thrift java api
Thanks Aaron,
I guess, you suggest I just borrow the logic
veloper
@aaronmorton
http://www.thelastpickle.com
On 6/07/2012, at 10:40 AM, Leonid Ilyevsky wrote:
I need to create a ByteBuffer instance containing the proper composite key,
based on the values of the components of the key. I am going to use it for
update operation.
I tried to simply concatenate the buf
I need to create a ByteBuffer instance containing the proper composite key,
based on the values of the components of the key. I am going to use it for
update operation.
I tried to simply concatenate the buffers corresponding to the components, but
I am not sure this is correct, because I am gett
update multiple column families using the same key? Shouldn't we design our
space in such a way that those columns live in the same column family?
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Thursday, July 05, 2012 10:39 AM
To: 'user@cassandra.apache.org'
Subject: b
My current way of inserting rows one by one is too slow (I use cql3 prepared
statements) , so I want to try batch_mutate.
Could anybody give me more details about the interface? In the javadoc it says:
public void
batch_mutate(java.util.Map>>>
mutation_map,
Consistenc
What is the penalty for using longer column names?
Should I sacrifice longer self-explanatory names for shorter cryptic ones to
save the disk space?
On one hand, I understand that Cassandra row id a key-value map, but on another
hand, it probably uses compression when storing them.
_
Before going into complex clustering topologies, I would like to try the most
simple configuration: just set up two nodes that will completely replicate each
other.
Could somebody tell me how to configure it?
Thanks!
This email, along with any attachments, is co
, Leonid Ilyevsky wrote:
Is there a way to control the floating numbers format in the cqlsh output? I
need more digits than it gives by default (in my tests, I see only one digit
after the point).
This email, along with any attachments, is confidential and may be legally
privileged or otherwise
The "select count(*) ..." query returns correct count only if it is <= 1,
otherwise it returns exactly 1.
This happens in both Java API and cqlsh.
Can somebody verify?
This email, along with any attachments, is confidential and may be legally
privileged or otherwise protected from disclo
Is there a way to control the floating numbers format in the cqlsh output? I
need more digits than it gives by default (in my tests, I see only one digit
after the point).
This email, along with any attachments, is confidential and may be legally
privileged or otherwise protected from disclosur
gards,
Roshni
On 11/06/12 7:20 PM, "Leonid Ilyevsky" wrote:
>Thanks, I understand what you are telling me. Obviously deleting the
>column is the proper way to do this in Cassandra.
>What I was looking for, is some convenient wrapper on top of that which
>will do it for me. Here
stpickle.com>> wrote:
>
> You don't nee to set columns to null, delete the column instead.
> Cheers
> ---------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
> On 8/06/2012, at 9:34 AM, Leonid Ilyevsky wrote:
>
> Is it possible t
Is it possible to explicitly set a column value to null?
I see that if insert statement does not include a specific column, that column
comes up as null (assuming we are creating a record with new unique key).
But if we want to update a record, how we set it to null?
Another situation is when I
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