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,
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
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 si...@majou.org 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
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
serge.fonvi...@gmail.com 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
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
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 data
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
On Thu, Jun 20, 2013 at 7:27 PM, aaron morton aa...@thelastpickle.comwrote:
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 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
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
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
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
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?
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 consistency,
On Thu, Jun 20, 2013 at 2:15 AM, aaron morton aa...@thelastpickle.com 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
On Wed, Jun 19, 2013 at 4:35 PM, Wei Zhu wz1...@yahoo.com 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
Good, fast and appreciated reaction from Datastax.
Also thanks to Radim for the warning.
Alain, Opscenter-free user.
2013/6/20 Nick Bailey n...@datastax.com
Thanks everyone. We always appreciate constructive criticism.
Regarding what OpsCenter collects, we completely agree it should be
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
svemala...@yahoo.com 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
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 rc...@eventbrite.com wrote:
On Thu, Jun 20, 2013 at 2:15 AM, aaron morton aa...@thelastpickle.com
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 kan...@mavenir.com 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
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)
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 arodr...@gmail.comwrote:
Good, fast and appreciated
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
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 d...@datastax.com wrote:
Nick,
Just a nit, but is it 'bdp_version' or 'dbp_versions'?
-
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
On Thu, Jun 20, 2013 at 2:48 PM, Marcelo Elias Del Valle
mvall...@gmail.com 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
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
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
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 ares.t...@gmail.com wrote:
Hi
We are considering using Cassandra in virtualization environment. I
wonder is
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