Hi!
I am using Cassandra with Hector. Usually I use ColumnFamilyTemplate and
ColumnFamilyUpdater to update column families, but sometimes I use Mutator.
1. Is there a preference of using one vs. the other?
2. Are there any actions that can be done with only one of them?
Thanks,
*Tamar Fraenkel
Hi *,
I would like to know your opinion about using Cassandra to implement a
RBAC-like authentication authorization model. We have simplified the
central relationship of the general model (
http://en.wikipedia.org/wiki/Role-based_access_control) to:
user ---n:m--- role ---n:m--- resource
Thanks.
But the increment is thread safe right? if I have two threads trying to
increment a counter, then they won't step on each other toe?
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54 8356490
Fax: +972
That's correct. If you run describe cluster normally you'll see something
like:
Cluster Information:
Snitch: org.apache.cassandra.locator.SimpleSnitch
Partitioner: org.apache.cassandra.dht.RandomPartitioner
Schema versions:
3a0f6a80-7140-11e1--511aec3785ff: [IP_OF_NODE,
On 20 March 2012 06:51, Tamar Fraenkel ta...@tok-media.com wrote:
But the increment is thread safe right? if I have two threads trying to
increment a counter, then they won't step on each other toe?
That's right - you can have many threads incrementing the same counter
and it's safe. But
On 3/15/12 9:16 AM, aaron morton wrote:
normally join-ring is only used when the node is having some sort of
problem.
The best approach to bringing up a new is to explicitly set the token
and start it with auto_bootstrap=true.
ok, the last thread says that 1.0+ onwards, thousands of CFs should
not be a problem.
But I am finding that all the allocated heap memory is getting consumed.
I started with 8GB heap and then on reading
You need to create the tombstone in case the data was inserted without a
timestamp at some point.
-Jeremiah
From: Radim Kolar [h...@filez.com]
Sent: Monday, March 19, 2012 4:48 PM
To: user@cassandra.apache.org
Subject: Re: repair broke TTL based
Hello.
From my experience it's unwise to make many column families for same
keys because you will have bloom filters and row indexes multiplied. If
you have 5000, you should expect your heap requirements multiplied by
same factor. Also check your cache sizes. Default AFAIR is 10 keys
per
This is a good presentation about using SSD with Cassandra.
It's by RickBranson, DataStax
http://www.slideshare.net/rbranson/cassandra-and-solid-state-drives
At Adobe we use SSD with great success to get RAM-like Read performance.
99% of all our requests are returned within 4 ms.
You can see a
I have both row cache and column cache disabled for all my CFs.
cfstats says Bloom Filter Space Used: 1760 per CF. Assuming it is in
bytes, it is total of about 9MB of bloom filter size for 5K CFs; which
is not a lot.
On Tue, Mar 20, 2012 at 11:09 AM, Vitalii Tymchyshyn tiv...@gmail.com wrote:
Is there any way to take rows with first key's part equals AA and second more
or equal BB?
Do a range slice starting with (AA:BB:) and without a finish row.
Remember that range slices (of rows) are not in order when using the Random
Partitioner.So you will also get back rows that have a lower
mmm, has repair completed on all nodes ?
Also, while it was digging around, I noticed that we do a LOT of reads
immediately after writes, and almost every read from the first DC was
bringing a read-repair along with it.
What CL are you using ?
Cheers
-
Aaron Morton
More exactly, if you write a record in a node in DC1 will it send one replica
of it to DC2 and then another replica to DC3? Or will the node in DC2
replicate the record to DC3 in a chain effect?
Coordinator in DC 1 will send the mutation to both DC2 and DC3 at the same
time.
I need to
What version are you using ?
IIRC not all versions of the Hive driver support counters.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 20/03/2012, at 1:09 PM, Sunit Randhawa wrote:
I am trying to store Counters CF from cassandra to
The reads are only fetching slices of 20 to 100 columns max at a time from
the row but if the key is planted on one node in the cluster I am concerned
about that node getting the brunt of traffic.
What RF are you using, how many nodes are in the cluster, what CL do you read
at ?
If you have
For hector based questions try the Hector User group
https://groups.google.com/forum/?fromgroups#!forum/hector-users
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 20/03/2012, at 7:26 PM, Tamar Fraenkel wrote:
Hi!
I am using
Using DSE 1.0.2. Changing the column value type to 'bigint' worked in
moving the Counters CF into Hive. Thanks Jake.
On Tue, Mar 20, 2012 at 10:21 AM, aaron morton aa...@thelastpickle.comwrote:
What version are you using ?
IIRC not all versions of the Hive driver support counters.
Cheers
user ---n:m--- role ---n:m--- resource
I'm not sure what this means.
While some inconsistencies may be acceptable, resource ownership (i.e.
role=owner) must never ever be mixed up.
If you are working at a high enough Consistent Level there Cassandra will
provide consistent behaviour.
no, describe cluster is a feature of the CLI.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 20/03/2012, at 11:24 AM, Shoaib Mir wrote:
On Tue, Mar 20, 2012 at 4:18 AM, aaron morton aa...@thelastpickle.com wrote:
There is a server side
On Wed, Mar 21, 2012 at 4:45 AM, aaron morton aa...@thelastpickle.comwrote:
no, describe cluster is a feature of the CLI.
How will you recommend doing schema level health checks (consistency) for
Cassandra within the cluster?
cheers,
Shoaib
user ---n:m--- role ---n:m--- resource
It can work, but Cassandra is not RDBMS as you know, so RDBMS-ish data
modeling may not fit in production. (depends on your requirement on
performance. I'm not sure.)
In general you should better to desgin schema from your access pattern.
maki
2012/3/20
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