Hi All,
1) What will happen if I run nodetool cleanup immediately after bringing a new
node up (i.e. before the key migration process is completed) ?
Will it cause some race conditions ? Or will it result in some part of
the space never be reclaimed ?
2) After adding a new machine, how
12.3 GB data per node (only one ńode).
16GB RAM.
In virtual environment with the CPU specified as "8 cores", average CPU use
is close to 0% (basically no load, around 12 requests / sec, mostly from
OpsCenter).
Average memory use is 4GB. Around 1GB heap used by Cassandra (out of 4GB).
2013/6/19 Mo
Hello,
If I store a video into a column, how can I get a fragment of it
without having to download it entirely ? Is there a way to give an
offset on a column ?
Do I have to fragment it over a lot of small fixed sizes columns ? Is
there any disadvantage to do so ? For example fragment a 10GB file
Fragment them in rows, that will help.
On 20 June 2013 09:43, Simon Majou wrote:
> Hello,
>
> If I store a video into a column, how can I get a fragment of it
> without having to download it entirely ? Is there a way to give an
> offset on a column ?
>
> Do I have to fragment it over a lot of s
Also, after a quick Google.
http://wiki.apache.org/cassandra/CassandraLimitations states values cannot
exceed 2GB, it also answers you offset question
HTH
Kind regards/met vriendelijke groet,
Serge Fonville
http://www.sergefonville.nl
Convince Microsoft!
They need to add TRUNCATE PARTITION in
Thanks Serge
Simon
On Thu, Jun 20, 2013 at 10:48 AM, Serge Fonville
wrote:
> Also, after a quick Google.
>
> http://wiki.apache.org/cassandra/CassandraLimitations states values cannot
> exceed 2GB, it also answers you offset question
>
> HTH
> Kind regards/met vriendelijke groet,
>
> Serge Fonv
> As for the thrift side (i.e. using Hector or Astyanax), anyone have a crafty
> way to inject something?
The only thing I've ever heard of coming close was a thrift bug that allowed a
malformed request to crash the server. But that was a while ago
https://issues.apache.org/jira/browse/CASSANDR
> 1) Is there any implication in running nodetool repair immediately after
> bringing a new node up (before key migration process is completed) ?
> Will it cause some race conditions ? Or will it result in some part
> of the space never be reclaimed ?
Repair will only be concerned with da
> nodetool compactionstats, gives
>
> pending tasks: 13120
If there are no errors in the log, I would say this is a bug.
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 19/06/2013, at 11:41 AM, Franc Carter wro
On Thu, Jun 20, 2013 at 7:27 PM, aaron morton wrote:
> nodetool compactionstats, gives
>
> pending tasks: 13120
>
> If there are no errors in the log, I would say this is a bug.
>
This happened after the node ran out of file descriptors, so an edge case
wouldn't surprise me.
I've rebuilt the
I once had something like this, looking at your logs I donot think it's the
same thing but here is a post on it
http://thelastpickle.com/2011/12/15/Anatomy-of-a-Cassandra-Partition/
It's a little different in 1.2 but the GossipDigestAckVerbHandler (and ACK2)
should be calling Gossiper.instance.
> What should be the path to investigate this?
Dropped messages are a symptom of other problems.
Look for the GCInspector logging lots of ParNew, or the IO system being
overloaded, or large (1000's) read or write batches from the client.
Cheers
-
Aaron Morton
Freelance Cassandr
Rob, Wei, thank you both for your responses - from what Rob says below my test
is a valid one.
I've run some additional tests and observed the following:
-- I mentioned before that some of the initial writes initially failed and then
succeed when the test tool retries them. I've checked that th
OpsCenter collects anonymous usage data and reports it back to
DataStax. For example, number of nodes, keyspaces, column families,
etc. Stat reporting isn't required to run OpsCenter however. To turn
this feature off, see the docs here (stat_reporter):
You never informed user that installing y
I use Cassandra, but I don't use OpsCenter.
Seems like it would be in everyone's best interest to clearly define what
data OpsCenter collects today, what OpsCenter won't collect and a promise
to users none of the data will be used without first getting a customer's
approval.
I can understand the
Dear everyone.
I'm Hiroshi Kise.
I will confirm with cqlsh of Cassandra-1.2.5, the behavior of the export /
import of data.
Using the Copy of cqlsh, the data included the “{“ and “[“ (= CollectionType)
case,
I think in the export / import process, data integrity is compromised.
How about?
Such
Thanks everyone. We always appreciate constructive criticism.
Regarding what OpsCenter collects, we completely agree it should be
documented more clearly. You can expect to see an update to the
documentation later today. I will update this thread once that goes live.
Regarding notifying the user
I don't think you can fully trust hintedhandoff, it's more like "we are trying
our best to deliver it" but no guarantee. Even if the hints are guaranteed to
be delivered and there will be a delay which is supposed to be part of
"eventual consistency" paradigm. If you want enforce real consistenc
On Thu, Jun 20, 2013 at 2:15 AM, aaron morton wrote:
>> As for the thrift side (i.e. using Hector or Astyanax), anyone have a crafty
>> way to inject something?
>
> The only thing I've ever heard of coming close was a thrift bug that allowed
> a malformed request to crash the server. But that wa
On Thu, Jun 20, 2013 at 12:01 AM, Emalayan Vairavanathan
wrote:
> 1) What will happen if I run nodetool cleanup immediately after bringing a
> new node up (i.e. before the key migration process is completed) ?
> Will it cause some race conditions ? Or will it result in some part
> of the s
On Wed, Jun 19, 2013 at 4:35 PM, Wei Zhu wrote:
> I was not aware of that. So we can avoid repair if there is no hardware
> failure...I found a blog:
>
> http://www.datastax.com/dev/blog/modern-hinted-handoff
Well... yes but no.
First, I do not believe that hardware failure is required, I believ
Good, fast and appreciated reaction from Datastax.
Also thanks to Radim for the warning.
Alain, Opscenter-free user.
2013/6/20 Nick Bailey
> Thanks everyone. We always appreciate constructive criticism.
>
> Regarding what OpsCenter collects, we completely agree it should be
> documented more
Hi All,
I have a question.
In the case where replace a cassandra node (call it node A) with
another one that has the exact same IP (ie. during a node failure), what
exactly should we do? Currently I understand that we should at least
run "nodetool repair". I noticed that the cassandra system
On Thu, Jun 20, 2013 at 10:40 AM, Emalayan Vairavanathan
wrote:
> In the case where replace a cassandra node (call it node A) with another one
> that has the exact same IP (ie. during a node failure), what exactly should
> we do? Currently I understand that we should at least run "nodetool
> repa
My first interaction with cassandra: ../nodeprobe -p 9160 ...
Hum I can't seem to reach it :) Ow its no longer running...
You've come along way baby.
On Thu, Jun 20, 2013 at 12:59 PM, Robert Coli wrote:
> On Thu, Jun 20, 2013 at 2:15 AM, aaron morton
> wrote:
> >> As for the thrift side (i.e.
Hi - What is the block size for Cassandra ? is it taken from the OS defaults ?
Have you seen this?
http://www.datastax.com/dev/blog/cassandra-file-system-design
Regards,
Shahab
On Thu, Jun 20, 2013 at 3:17 PM, Kanwar Sangha wrote:
> Hi – What is the block size for Cassandra ? is it taken from the OS
> defaults ?
>
Yes. Is that not specific to hadoop with CFS ? I want to know that If I have a
data in column of size 500KB, how many IOPS are needed to read that ? (assuming
we have key cache enabled)
From: Shahab Yunus [mailto:shahab.yu...@gmail.com]
Sent: 20 June 2013 14:32
To: user@cassandra.apache.org
Sub
Ok. Though the closest that I can find is this (Aaron Morton's great blog):
http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/
I would also like to know the answer as, as such, I also haven't came
across 'block size' as a core concept (or a concept to be considered while
developing with) C
As promised, updated docs detailing the data collected by OpsCenter are now
live.
http://www.datastax.com/docs/opscenter/configure/configure_opscenter_adv#stat-reporter-interval
-Nick
On Thu, Jun 20, 2013 at 12:34 PM, Alain RODRIGUEZ wrote:
> Good, fast and appreciated reaction from Datastax.
Nick,
Just a nit, but is it 'bdp_version' or 'dbp_versions'?
- 'bdp_version': A list of the different DataStax Enterprise versions in
the cluster.
Also, is this "report" available from OpsCenter? Seems like it would be
nice to display a message to the user about what we send, and then pr
It is 'bdp_version' even though it is a list. That is a bit confusing.
Thanks, I've added that additional feedback to our tracker.
-Nick
On Thu, Jun 20, 2013 at 3:47 PM, Dave Finnegan wrote:
> Nick,
>
> Just a nit, but is it 'bdp_version' or 'dbp_versions'?
>
>
>- 'bdp_version': A list of
Hello,
I Currently use Netflix Priam to create backups of sstables to Amazon
S3. I like how it works, as it can create continuous backups as well as
snapshots, but I personally don`t like to be tied to a vendor, in this
case, Amazon.
Does anybody know if there is some similar tool to do ba
On Thu, Jun 20, 2013 at 2:48 PM, Marcelo Elias Del Valle
wrote:
> I Currently use Netflix Priam to create backups of sstables to Amazon
> S3. I like how it works, as it can create continuous backups as well as
> snapshots, but I personally don`t like to be tied to a vendor, in this case,
> Ama
Can you paste the output of cfstats and cfhistograms?
Also try and get histo at 2 diff points 1) when it looks good 2) when it
gets slow
http://docs.oracle.com/javase/6/docs/technotes/tools/share/jmap.html
Look for jmap -histo
On Thu, Jun 20, 2013 at 12:27 AM, Joel Samuelsson wrote:
> 12.3 GB
Really? if you care about security, you deny all outbound traffic anyway
and phone home software does not work That which is not specifically
allowed is denied.
That is how we realized quartz does phone home.
Understandably most people don't like phone home features, but i do see
that knowing
Hi
We are considering using Cassandra in virtualization environment. I
wonder is Cassandra using unicast/broadcast/multicast for node discover or
communication?
From the code, I find the broadcast address is used for heartbeat in
Gossiper.java, but I don't know how actually it works when nod
Cassandra works very well in EC2 environment. EC2 doesn't support
broadcast/multicast. So, you should be fine.
Thank you,
Andrey
On Thu, Jun 20, 2013 at 7:22 PM, Jason Tang wrote:
> Hi
>
>We are considering using Cassandra in virtualization environment. I
> wonder is Cassandra using unic
38 matches
Mail list logo
