Create different user and assign role and privileges. Create a user like
guest and grant select only to that user. That way user cannot modify data
in specific keyspace or column family.
http://www.datastax.com/documentation/cql/3.0/cql/cql_reference/grant_r.html
-Vivek
On Mon, Jul 21, 2014 at
Having said that, what Java clients should I be looking at? Are there
any reasonably mature PoJo mapping techs for Cassandra analogous to
Hibernate?
The Java Driver offers a basic object mapper in the mapper module. If you
look for something more evolved, have a look at
In my experience, SSTable FileNotFoundException, not only caused by
recreate a table but also other operations or even bug, cannot be solved
by any nodetool command. However, restart the node for more than one time
can make this Exception disappear. I don't know the reason but it does
work...
On Sat, Jul 19, 2014 at 7:35 PM, Karl Rieb karl.r...@gmail.com wrote:
Can now be followed at:
https://issues.apache.org/jira/browse/CASSANDRA-7576.
Nice work! Finally we have a proper solution to this issue, so well done to you.
I see.
Thanks a lot ☺
From: Vivek Mishra [mailto:mishra.v...@gmail.com]
Sent: 2014年7月21日 14:16
To: user@cassandra.apache.org
Subject: Re: How to prevent writing to a Keyspace?
Create different user and assign role and privileges. Create a user like guest
and grant select only to that user.
Hello,
Here is the documentation for cfhistograms, which is in microseconds.
http://www.datastax.com/documentation/cassandra/2.0/cassandra/tools/toolsCFhisto.html
Your question about setting timeouts is subjective, but you have set your
timeout limits to 4 mins, which seems excessive.
The
I have not seen the issue after changing the commit log segment size to 1024MB.
tpstats output:
Pool Name Active Pending Completed Blocked All
time blocked
ReadStage 0 0 0 0
0
thank you for the reply; I was hoping for something with a bit less
overhead than the first solution; the second is not really an option for me.
On Monday, 21 July 2014, DuyHai Doan doanduy...@gmail.com wrote:
1) Use separate counter to count number of entries in each column family
but it will
Hi,
I have the need to executing a map/reduce job to identity data stored in
Cassandra before indexing this data to Elastic Search.
I have already used ColumnFamilyInputFormat (before start using CQL) to
write hadoop jobs to do that, but I use to have a lot of troubles to
perform tunning, as
Hey Marcelo,
You should check out spark. It intelligently deals with a lot of the
issues you're mentioning. Al Tobey did a walkthrough of how to set up
the OSS side of things here:
http://tobert.github.io/post/2014-07-15-installing-cassandra-spark-stack.html
It'll be less work than writing a
Hi Jonathan,
Do you know if this RDD can be used with Python? AFAIK, python + Cassandra
will be supported just in the next version, but I would like to be wrong...
Best regards,
Marcelo Valle.
2014-07-21 13:06 GMT-03:00 Jonathan Haddad j...@jonhaddad.com:
Hey Marcelo,
You should check out
I haven't tried pyspark yet, but it's part of the distribution. My
main language is Python too, so I intend on getting deep into it.
On Mon, Jul 21, 2014 at 9:38 AM, Marcelo Elias Del Valle
marc...@s1mbi0se.com.br wrote:
Hi Jonathan,
Do you know if this RDD can be used with Python? AFAIK,
Jonathan,
By what I have read in the docs, Python API has some limitations yet, not
being possible to use any hadoop binary input format.
The python example for Cassandra is only in the master branch:
https://github.com/apache/spark/blob/master/examples/src/main/python/cassandra_inputformat.py
I routinely get this exception from cqlsh on one of my clusters:
cql.cassandra.ttypes.AuthenticationException:
AuthenticationException(why='org.apache.cassandra.exceptions.ReadTimeoutException:
Operation timed out - received only 2 responses.')
The system_auth keyspace is set to replicate X
On Mon, Jul 21, 2014 at 10:54 AM, Marcelo Elias Del Valle
marc...@s1mbi0se.com.br wrote:
My understanding (please some correct me if I am wrong) is that when you
insert N items in a Cassandra CF, you are executing N binary searches to
insert the item already indexed by a key. When you read
On Mon, Jul 21, 2014 at 8:07 AM, Bhaskar Singhal bhaskarsing...@yahoo.com
wrote:
I have not seen the issue after changing the commit log segment size to
1024MB.
Yes... your insanely over-huge commitlog will be contained in fewer files
if you increase the size of segments that will not
On Mon, Jul 21, 2014 at 1:58 AM, Ben Hood 0x6e6...@gmail.com wrote:
On Sat, Jul 19, 2014 at 7:35 PM, Karl Rieb karl.r...@gmail.com wrote:
Can now be followed at:
https://issues.apache.org/jira/browse/CASSANDRA-7576.
Nice work! Finally we have a proper solution to this issue, so well done
I did not include unit tests in my patch. I think many people did not run into
this issue because many Cassandra clients handle the DateType when found as a
CUSTOM type.
-Karl
On Jul 21, 2014, at 8:26 PM, Robert Coli rc...@eventbrite.com wrote:
On Mon, Jul 21, 2014 at 1:58 AM, Ben Hood
Hi Robert,
First of all, thanks for answering.
2014-07-21 20:18 GMT-03:00 Robert Coli rc...@eventbrite.com:
You're wrong, unless you're talking about insertion into a memtable, which
you probably aren't and which probably doesn't actually work that way
enough to be meaningful.
On disk,
On Mon, Jul 21, 2014 at 5:45 PM, Marcelo Elias Del Valle
marc...@s1mbi0se.com.br wrote:
Although several sstables (disk fragments) may have the same row key,
inside a single sstable row keys and column keys are indexed, right?
Otherwise, doing a GET in Cassandra would take some time.
From
Hi,
But if you are only relying on memtables to sort writes, that seems like a
pretty heavyweight reason to use Cassandra?
Actually, it's not a reason to use Cassandra. I already use Cassandra and I
need to map reduce data from it. I am trying to see a reason to use the
conventional M/R
So I appreciate all the help so far. Upfront, it is possible the schema
and data query pattern could be contributing to the problem. The schema
was born out of certain design requirements. If it proves to be part of
what makes the scalability crumble, then I hope it will help shape the
design
I could you perhaps check your ntp?
On Tue, Jul 22, 2014 at 3:35 AM, Jeremy Jongsma jer...@barchart.com wrote:
I routinely get this exception from cqlsh on one of my clusters:
cql.cassandra.ttypes.AuthenticationException:
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