I am sorry if I was not clear. I was using nodes to refer machines (or vice
versa).
Let me put in another way...
The application is composed of multiple instances of an executable. The
application runs on multiple machines concurrently. All the instances are going
to issue the same CQL comman
> I am currently trying to really study the effect of the width of a row
> (being in multiple sstables) vs its 95th percentile read time.
I'd be interested to see your findings.
Is use 3+ SSTables per read as (from cfhistograms) as a warning sign to dig
deeper in the data model. Also the type
Thanks, when and were is the talk ?
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 23/05/2013, at 6:42 AM, Peter Lin wrote:
>
> NativeX is giving a talk about using Cassandra with .Net. Our firm created a
> port
> 1. Is compaction supposed to go off during a bootstrapping node?
When a new file is received during streaming it is added to the list of
SSTables for the CF through the same process as a SSTable flush. Once the
SStable count gets high enough compaction will do it's thing.
> 2. I seem to rec
> Any other ideas?
Sounds like a nasty heisenbug, can you replace or rebuild the machine?
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 21/05/2013, at 9:36 PM, Michal Michalski wrote:
> I've finally had some time
For some reason the 1.0.7 hints actually use a super column :)
On Thu, May 23, 2013 at 6:18 PM, aaron morton wrote:
> I know how this sounds, but upgrading to 1.1.11 is the best approach.
> 1.0X is not getting any fixes, 1.1X is the most stable and still getting
> some patches, and 1.2 is stable
I know how this sounds, but upgrading to 1.1.11 is the best approach.
1.0X is not getting any fixes, 1.1X is the most stable and still getting some
patches, and 1.2 is stable and in use.
Hint storage has been redesigned in 1.2.
> Any suggestions on how to make the cluster more tolerant to dow
If you are reading and writing at CL QUOURM and getting inconsistent results
that sounds like a bug. If you are mixing the CL levels such that R + W <= N
then it's expected behaviour.
Can you reproduce the issue outside of your app ?
Cheers
-
Aaron Morton
Freelance Cassandra
On Wed, May 22, 2013 at 11:32 PM, Tamar Fraenkel wrote:
> I am using Hector HLockManagerImpl, which creates a keyspace named
> HLockManagerImpl and CF HLocks.
> For some reason I have a row with single column that should have expired
> yesterday who is still there.
> I tried deleting it using cli,
so where the multiple nodes are? I am just puzzled
From: Emalayan Vairavanathan
Sent: Thursday, May 23, 2013 3:43 PM
To: Arthur Zubarev ; user@cassandra.apache.org
Subject: Re: Creating namespace and column family from multiple nodes
concurrently
"Would each device/machine have its own keyspa
On Thu, May 23, 2013 at 12:07 PM, Emalayan Vairavanathan
wrote:
> Do you have any idea how Cassandra is going to handle concurrent namespace
> and column family creation (Here all the instances are going to create the
> same namespace and column families concurrently)?
> [...]
> However I am not s
"Would each device/machine have its own keyspace?"
No. All the machines are going to run the exactly same CQL commands and going
to create the same namespace and column families.
Thank you
Emalayan
From: Arthur Zubarev
To: Emalayan Vairavanathan ; user@cassan
Would each device/machine have its own keyspace?
Basically, your client needs to take care of a successful creation of the
schema and any other verifications and it is going to be time consuming.
From: Emalayan Vairavanathan
Sent: Thursday, May 23, 2013 3:07 PM
To: user@cassandra.apache.org
S
Hi Arthur and Farraz,
Thank you for getting back to me.
I am trying to avoid sync among concurrent instances and this is why I am
preferring Option - 2. Further in my application, I have reasonable window
between the application initialization phase and the application runtime. So
as long as
> Does anyone know I way I could expose the write time of set items?
>
You cannot currently unfortunately.
The problem is really just an API one. Since currently you can only ever
query a full collection, you cannot apply writeTime() to only an element,
and applying it to the whole collectio
What kind of error does the other end of streaming(/10.10.42.36) say?
On Wed, May 22, 2013 at 5:19 PM, Hiller, Dean wrote:
> We had 3 nodes roll on good and the next 2, we see a remote node with this
> exception every time we start over and bootstrap the node
>
> ERROR [Streaming to /10.10.42.36
> Are you sure that it is a good idea to estimate remainingKeys like that?
Since we don't want to scan every row to check overlap and cause heavy
IO automatically, the method can only do the best-effort type of
calculation.
In your case, try running user defined compaction on that sstable
file. It
Hi all,
I am using C* 1.2.4 with CQL3 and am taking advantage of the new collection
support. One usage case I have is that I want a set of text and I need to know
the time when each item in the set was written. If I understand CQL3
correctly, the underlying data engine utilizes composites
I have used both rotation disks with lots of RAM as well as SSD devices. An
important thing to consider is that SSD devices are not magic. You have
big-o-notation in several places.
1) more data large bloom filters
2) more data (larger key caches) JVM overhead
3) more requests more young gen JVM ov
Hi Igor,
I was talking about 99th percentile from the Cassandra histograms when I
said '1 or 2 ms for most cf'.
But we have measured client side too and generally get a couple ms added on
top.. as one might expect.
Anyone interested -
diskio (my original question) we have tried out t
Hello Christopher,
BTW, are you talking about 99th percentiles on client side, or about
percentiles from cassandra histograms for CF on cassandra side?
Thanks!
On 05/22/2013 05:41 PM, Christopher Wirt wrote:
Hi Igor,
Yea same here, 15ms for 99^th percentile is our max. Currently getting
o
Sstables must be sorted by token, or we can't compact efficiently.
Since writes usually do not arrive in token order, we stage them first
in a memtable.
(cc user@)
On Thu, May 23, 2013 at 8:44 AM, Ansar Rafique wrote:
> Hi Jonathan,
>
> I am Ansar Rafique and I asked you few questions 2 week ago
good point!
*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 2 5612956
On Thu, May 23, 2013 at 2:25 PM, wrote:
> (Probably will not solve your problem, but worth mentioning): It’s not
>
(Probably will not solve your problem, but worth mentioning): It's not enough
to check that the clocks of all the servers are synchronized - I believe that
the client node sets the timestamp for a record being written. So, you should
also check the timestamp on your Hector client nodes.
From: T
Hi!
TTL was set:
[default@HLockingManager] get
HLocks['/LockedTopic/31a30c12-652d-45b3-9ac2-0401cce85517'];
=> (column=69b057d4-3578-4326-a9d9-c975cb8316d2,
value=36396230353764342d333537382d343332362d613964392d633937356362383331366432,
timestamp=1369307815049000, ttl=10)
Also, all other lock c
Maybe you didn't set the TTL correctly.
Check the TTL of the column using CQL, e.g.:
SELECT TTL (colName) from colFamilyName WHERE ;
From: Felipe Sere [mailto:felipe.s...@1und1.de]
Sent: Thursday, May 23, 2013 1:28 PM
To: user@cassandra.apache.org
Subject: AW: column with TTL of 10 seconds lives v
This is interesting as it might affect me too :)
I have been observing deadlocks with HLockManagerImpl which dont get resolved
for a long time
even though the columns with the locks should only live for about 5-10secs.
Any ideas how to investigate this further from the Cassandra-side?
___
Thanks for the response.
Running date simultaneously on all nodes (using parallel ssh) shows that
they are synced.
Tamar
*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 2 5612956
On Thu,
Did you synchronized the clocks between servers?
On Thu, May 23, 2013 at 9:32 AM, Tamar Fraenkel wrote:
> Hi!
> I have Cassandra cluster with 3 node running version 1.0.11.
>
> I am using Hector HLockManagerImpl, which creates a keyspace named
> HLockManagerImpl and CF HLocks.
> For some reason
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