Hi All,
I want to create a readonly account, so i run the following command following:
http://docs.datastax.com/en/cassandra/1.2/cassandra/security/security_config_native_authenticate_t.html
CREATE USER readonly WITH PASSWORD '' ;
GRANT SELECT ON ALL KEYSPACES TO readonly;
Then I login De
Check Cassandra logs for tombstone threshold error
On Aug 3, 2015 7:32 PM, "Robert Coli" wrote:
> On Mon, Aug 3, 2015 at 2:48 PM, Sid Tantia > wrote:
>
>> Any select all or select count query on a particular table is timing out
>> with "Cassandra::Errors::TimeoutError: Timed out"
>>
>> A “SELECT
On Mon, Aug 3, 2015 at 2:48 PM, Sid Tantia
wrote:
> Any select all or select count query on a particular table is timing out
> with "Cassandra::Errors::TimeoutError: Timed out"
>
> A “SELECT * FROM WHERE = ‘’
> on the table works, but a “SELECT * FROM LIMIT 1; does not work.
> All other tables
Right, thanks for pointing that out. I am running Cassandra v2.1.4
On Mon, Aug 3, 2015 at 2:51 PM, Jim Witschey
wrote:
> You might want to send another email to the list specifying the Cassandra
> version.
> On Mon, Aug 3, 2015 at 5:48 PM Sid Tantia
> wrote:
>> Hello,
>>
>> Any select all or se
Hello,
Any select all or select count query on a particular table is timing out with
"Cassandra::Errors::TimeoutError: Timed out"
A “SELECT * FROM WHERE = ‘’ on the
table works, but a “SELECT * FROM LIMIT 1; does not work. All other
tables and queries work.
Any ideas as to why this migh
Thanks Rob.
But even if we do move out of EC2 in X years, unlike partitioner, I don't
think there is much to do to switch snitch. Yes, I am evaluating if there
is actually good benefit to use EC2.
John
On Mon, Aug 3, 2015 at 1:54 PM, Robert Coli wrote:
> On Sun, Aug 2, 2015 at 6:22 PM, John Wo
On Sun, Aug 2, 2015 at 6:22 PM, John Wong wrote:
> What other benefits can Ec2Snitch provide in a single-region, multi-az AWS
> deployment besides automatically setting dc and rack for you as the snitch
> reads from EC2 metadata.
> Obviously there is a concern with what if there is something wron
Thanks a lot for the info!
I see, the paxos protocol used now in the code is actually the
"single-decree synod" protocol, which votes on only one value.
the scope of the implementation is only the CAS operation (which contains a
read and write), not a generic txn (which could contain arbitrari
The Cassandra team is pleased to announce the release of Apache Cassandra
version 3.0.0-alpha1.
This is the first test build of Cassandra 3.0 that includes:
* New storage engine
* New sstable format
* Materialized Views
We expect bugs in this release so test and report any issues please
If i remember correctly;
In real life gossip, you can not get the information before you give some.
New machine sends it's own state to seed node, seed node replys this
message with list of other nodes and their states (end of seed node
role), then after a while (if i remember correctly gossip p
If all the streams are failing it might be due to your VPN tunnel linking
the 2 DC or to some port issue, make sur this is ok (Cassandra uses port
7000 for internal communication by default).
I am using this exact same setup and never had streaming issues, excepted
during some big repairs. I would
Hi all,
Please, i try to undestand how gossip protocol is used in cassandra.
I read this:
“This is most critical the first time a node starts up. By default, a node
remembers other nodes it has gossiped with between subsequent restarts. *The
seed node designation has no purpose other than boo
Ok, thank you so much for answer.
Kind Regards.
2015-08-03 15:09 GMT+01:00 DuyHai Doan :
> Yes it is used by Gossip
>
> On Mon, Aug 3, 2015 at 3:33 PM, Thouraya TH wrote:
>
>> Ok, i will see this reference. thank you so much for answer.
>> So i understand that this value is used by gossip protoc
Yes it is used by Gossip
On Mon, Aug 3, 2015 at 3:33 PM, Thouraya TH wrote:
> Ok, i will see this reference. thank you so much for answer.
> So i understand that this value is used by gossip protocol ? that's it ?
> Best Regards.
>
> 2015-08-03 13:41 GMT+01:00 DuyHai Doan :
>
>> You can read thi
Ok, i will see this reference. thank you so much for answer.
So i understand that this value is used by gossip protocol ? that's it ?
Best Regards.
2015-08-03 13:41 GMT+01:00 DuyHai Doan :
> You can read this paper that explains the Phi Accrual Failure detection
> algo: http://vsedach.googlepages
You can read this paper that explains the Phi Accrual Failure detection
algo: http://vsedach.googlepages.com/HDY04.pdf
The phi value is the level of suspicion a server might be down.
phi_convict_threshold = suspicion level above which a server is marked down
On Mon, Aug 3, 2015 at 1:29 PM, Thour
Hi all,
Please, can you explain me this sentence:
The configuration parameter phi_convict_threshold in the cassandra.yaml
file is used to control Cassandra’s sensitivity of node failure detection.
?
Thank you so much for help.
Kind regards.
"you seem to be suggesting that the "other operations on the same partition
key have to wait" because Paxos grouped the first series together, which
have to be committed in the same order , before all other operations,
essentially ___serializing___ the operations (with guaranteed same order)."
-->
Thank you so much for help.
Kind regards.
2015-08-02 20:57 GMT+01:00 Bharatendra Boddu :
> Cassandra is based on Scuttle-butt protocol. Reference:
>
> Robbert van Renesse, Dan Mihai Dumitriu, Valient Gough, and Chris Thomas.
> Efficient reconciliation and flow control for anti-entropy protocols.
thanks for your answer DuyHai.
I understand Paxos. but I think your description seems missing one
important point: in the example you gave, "a series of ongoing operation
(INSERT, UPDATE , DELETE ...) " you seem to be suggesting that the "other
operations on the same partition key have to wait" be
"what is the fundamental difference between the standard replication
protocol and Paxos that prevents us from implementing a 2-pc on top of the
standard protocol?"
--> for a more detailed description of Paxos, look here:
http://www.slideshare.net/doanduyhai/distributed-algorithms-for-big-data-geec
Correct. Note that you may lose some performance this way though; in a typical
case saving bandwidth by increasing CPU usage is good. However, it always
depends on your usecase and whether you’re running your cluster to the max.
It’s a good, low-hanging optimization to keep in mind though for p
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