On Sat, May 7, 2011 at 7:20 PM, Terje Marthinussen
wrote:
> This is an all ssd system. I have no problems with read/write performance
> due to I/O.
> I do have a potential with the crazy explosion you can get in terms of disk
> use if compaction cannot keep up.
>
> As things falls behind and you g
"I'm also not too much in favor of triggering major compactions, because it
mostly have a nasty effect (create one huge sstable)."
If that is the case, why can't major compactions create many,
non-overlapping SSTables?
In general, it seems to me that non-overlapping SSTables have all the
advantag
Gossip should help them converge on the truth.
Can you give an example of the different views from nodetool ring ?
Also check the logs to see if there is anything been logged about endpoints.
Hope that helps.
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://
That was my initial thought, just wanted to see if there was anything else
going on. Sounds like Henrik has a workaround so all is well.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 9 May 2011, at 18:10, Jonathan Ellis wrote:
Yes, agreed.
I actually think cassandra has to.
And if you do not go down to that single file, how do you avoid getting into
a situation where you can very realistically end up with 4-5 big sstables
each having its own copy of the same data massively increasing disk
requirements?
Terje
On Mon,
On Sun, May 8, 2011 at 7:17 PM, aaron morton wrote:
> What version are you on ?
>
> Check the nodetool ring from each node in your cluster to check they have the
> same view.
I am running 0.7.3. I checked nodetool ring on all hosts and it all
comes back the same. I had some funky business whe
You can check the schema using cassandra-cli, run "describe cluster" it will
tell you how many schemas are defined.
I think the best approach when you discover bad schemas is to drain then stop
the affected node, remove the Location, Migrations and Schema files in the
System data directory, re
On Mon, May 9, 2011 at 7:18 AM, aaron morton wrote:
> You can check the schema using cassandra-cli, run "describe cluster" it will
> tell you how many schemas are defined.
> I think the best approach when you discover bad schemas is to drain then
> stop the affected node, remove the Location, Migr
If they each have their own copy of the data, then they are *not*
non-overlapping!
If you have non-overlapping SSTables (and you know the min/max keys), it's
like having one big SSTable because you know exactly where each row is, and
it becomes easy to merge a new SSTable in small batches, rather
Sorry, I was referring to the claim that "one big file" was a problem, not
the non-overlapping part.
If you never compact to a single file, you never get rid of all
generations/duplicates.
With non-overlapping files covering small enough token ranges, compacting
down to one file is not a big issue
Fixed since 0.7.4. You should upgrade.
https://issues.apache.org/jira/browse/CASSANDRA-2282
On Sun, May 8, 2011 at 2:37 PM, Eric tamme wrote:
> I have a 4 node ring that was setup with tokens a,b,c,d using NTS and
> 2 nodes in each of 2 datacenters with a replication of DC1:1, DC2:1.
> I was get
I get this error:
bin/cassandra: syntax error at line 29: `system_memory_in_mb=$' unexpected
Thanks
JK
--
It's always darkest just before you are eaten by a grue.
Use bash as a shell
#bash bin/cassandra -f
-Ursprüngliche Nachricht-
Von: Jeffrey Kesselman [mailto:jef...@gmail.com]
Gesendet: Montag, 9. Mai 2011 17:12
An: user@cassandra.apache.org
Betreff: Does anyone have Cassandra running on OpenSolaris?
I get this error:
bin/cassandra: syntax
Ah. That solved it. ty.
On Mon, May 9, 2011 at 11:29 AM, Roland Gude wrote:
>
> Use bash as a shell
>
> #bash bin/cassandra -f
>
>
> -Ursprüngliche Nachricht-
> Von: Jeffrey Kesselman [mailto:jef...@gmail.com]
> Gesendet: Montag, 9. Mai 2011 17:12
> An: user@cassandra.apache.org
> Betref
Hi everyone.
I have a few sstables with around 500 million keys, and memory usage has
grown a lot, I suppose because of the indexes. This sstables are
comprised of skinny rows, but a lot of them. Would tuning index interval
make the memory usage go down? And what would the performance hit be?
I
> I have a few sstables with around 500 million keys, and memory usage has
> grown a lot, I suppose because of the indexes. This sstables are
> comprised of skinny rows, but a lot of them. Would tuning index interval
> make the memory usage go down? And what would the performance hit be?
Assuming
El lun, 09-05-2011 a las 17:58 +0200, Peter Schuller escribió:
> > I have a few sstables with around 500 million keys, and memory usage has
> > grown a lot, I suppose because of the indexes. This sstables are
> > comprised of skinny rows, but a lot of them. Would tuning index interval
> > make the
> I have not looked into smaps before. But it actually seems odd that that
> mmaped Index files are taking up so *little memory*. Are they only a
> few kb on disk?
The sum of the sizes of all *-Index.db files in /var/lib/cassandra is 2924kb.
> Is this a snapshot taken shortly after the process
>
On Thu, May 5, 2011 at 5:56 PM, Benjamin Coverston
wrote:
> How many column families do you have?
We have 10 key spaces, each with 2 column families.
>
> On 5/4/11 12:50 PM, Hannes Schmidt wrote:
>>
>> Hi,
>>
>> We are using Cassandra 0.6.12 in a cluster of 9 nodes. Each node is
>> 64-bit, has 4
On Thu, May 5, 2011 at 4:16 PM, aaron morton wrote:
> Hannes,
> To get a baseline of behaviour set disk_access to standard. You will
> probably want to keep it like that if you want better control over the memory
> on the box.
I'll do a test with standard and report back.
>
> Als
Jonathan thanks for your email. If I use datacenter shard strategy in
cassandra
how will it effect the ring structure of the cassandra cluster can you
please explain.
Thanks
Anurag
On Sun, May 8, 2011 at 11:13 PM, Jonathan Ellis wrote:
> Step 0: Upgrade to 0.7 and read about NetworkTopologyStra
Thanks!
On Sun, May 8, 2011 at 3:40 PM, aaron morton wrote:
> Ah, I see the case you are talking about.
>
> If the node will auto bootstrap on startup if when it joins the ring: it is
> not already bootstrapped, auto bootstrap is enabled, and the node is not in
> it's own seed list.
>
> In the au
Hi Adam,
We have been facing some similar issues of late. Wondering if Jonathan's
suggestions worked for you.
Thanks!
On Sat, May 7, 2011 at 6:37 PM, Jonathan Ellis wrote:
> The live:serialized size ratio depends on what your data looks like
> (small columns will be less efficient than large blo
If you are using 0.7 the recommended approach is to use the
NetworkTopologyStrategy.
Here is a recent discussion on setting the tokens in a multi DC deployment
http://www.mail-archive.com/user@cassandra.apache.org/msg12898.html
Can you move to 0.7 ?
Cheers
-
Aaron Morton
Free
I have a Cassandra 0.7.0, 3 node cluster with logging set to DEBUG. A few
days ago, and I'm not sure what triggered this, the logs started showing
messages like
DEBUG 17:37:30,399 logged out: #
every second or so, regardless whether there was Cassandra activity. Today I
just upgraded to 0.7.5,
On 5/6/11 9:47 PM, Jonathan Ellis wrote:
On Fri, May 6, 2011 at 5:13 PM, Alex Araujo
wrote:
I raised the default MAX_HEAP setting from the AMI to 12GB (~80% of
available memory).
This is going to make GC pauses larger for no good reason.
Good point - only doing writes at the moment. I will r
It just means a client connection was closed.
On Mon, May 9, 2011 at 5:41 PM, Suan Aik Yeo wrote:
> I have a Cassandra 0.7.0, 3 node cluster with logging set to DEBUG. A few
> days ago, and I'm not sure what triggered this, the logs started showing
> messages like
> DEBUG 17:37:30,399 logged
Hi All,
I have following in my cassandra.yaml
keyspaces:
- column_families:
- column_metadata: []
column_type: Standard
compare_with: BytesType
gc_grace_seconds: 86400
key_cache_save_period_in_seconds: 14400
keys_cached: 0.0
max_compaction_threshold: 32
memt
http://wiki.apache.org/cassandra/FAQ#no_keyspaces
On Mon, May 9, 2011 at 7:51 PM, Anurag Gujral wrote:
> Hi All,
>I have following in my cassandra.yaml
> keyspaces:
> - column_families:
> - column_metadata: []
> column_type: Standard
> compare_with: BytesType
> gc_grace_
Ah, must be the status check that I set up. Thanks!
On Mon, May 9, 2011 at 7:42 PM, Tyler Hobbs wrote:
> It just means a client connection was closed.
>
>
> On Mon, May 9, 2011 at 5:41 PM, Suan Aik Yeo wrote:
>
>> I have a Cassandra 0.7.0, 3 node cluster with logging set to DEBUG. A few
>> days
Hello,
I am unclear on Why deleting a row in Cassandra does not delete a row key?
Is an empty row never deleted from Column Family?
It would be of great help if someone can elaborate on this.
Thanks,
Anuya
Hello,
>
> I am unclear on Why deleting a row in Cassandra does not delete a row key?
> Is an empty row never deleted from Column Family?
>
> It would be of great help if someone can elaborate on this.
>
> Thanks,
> Anuya
>
http://wiki.apache.org/cassandra/FAQ#range_ghosts
On Mon, May 9, 2011 at 9:24 PM, anuya joshi wrote:
> Hello,
>
> I am unclear on Why deleting a row in Cassandra does not delete a row key?
> Is an empty row never deleted from Column Family?
>
> It would be of great help if someone can elaborate o
On Mon, May 9, 2011 at 5:58 PM, Alex Araujo > How many
replicas are you writing?
>
> Replication factor is 3.
So you're actually spot on the predicted numbers: you're pushing
20k*3=60k "raw" rows/s across your 4 machines.
You might get another 10% or so from increasing memtable thresholds,
but bo
Hi,
I am trying to rename my cluster which has several keyspaces running on
cassandra 0.7.5. When I try to remove the system files as suggested by
http://wiki.apache.org/cassandra/FAQ#clustername_mismatch , I get "Could not
read system table. Did you change partitioners?" error. If I remove all t
Can you provide the full error stack, it will show where it failed when
starting up.
AFAIK this i the correct process. I just did a quick test on a singe 0.7 node
and it could start up after removing the locations SSTables.
If you go ahead with removing all the system sstables you can re-recr
Look for "Where are my keyspaces?" on following page:
*http://wiki.apache.org/cassandra/StorageConfiguration
*
On Mon, May 9, 2011 at 5:51 PM, Anurag Gujral wrote:
> Hi All,
>I have following in my cassandra.yaml
> keyspaces:
> - column_families:
> - column_metadata: []
> column_
http://wiki.apache.org/cassandra/FAQ#no_keyspaces
On Tue, May 10, 2011 at 6:21 AM, Narendra Sharma
wrote:
> Look for "Where are my keyspaces?" on following page:
> *http://wiki.apache.org/cassandra/StorageConfiguration
> *
> On Mon, May 9, 2011 at 5:51 PM, Anurag Gujral wrote:
>
>> Hi All,
>>
As a side note, be aware that running with DEBUG logging enabled can make
your cluster run a full order of magnitude slower.
On Mon, May 9, 2011 at 6:54 PM, Suan Aik Yeo wrote:
> Ah, must be the status check that I set up. Thanks!
>
>
> On Mon, May 9, 2011 at 7:42 PM, Tyler Hobbs wrote:
>
>> It
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