Having just enough RAM to hold the JVM's heap generally isn't a good idea
unless you're not planning on doing much with the machine.
Any memory not allocated to a process will generally be put to good use
serving as page cache. See here: http://en.wikipedia.org/wiki/Page_cache
Jon
On Tue, Jul
Jon,
On 31.07.2013, at 08:15, Jonathan Haddad j...@jonhaddad.com wrote:
Having just enough RAM to hold the JVM's heap generally isn't a good idea
unless you're not planning on doing much with the machine.
Yes, I agree. Two questions though:
- Do you think that using a JVM heap of, for
Config : 3 nodes running 1.1.3 (x2) and one node running 1.1.12. No caches,
lots of column families. memtable_total_space_in_mb set to 4096MB
Reduce this to 2048 so it will flush to disk more frequently and avoid growing
the heap so much.
From what you've said I would be looking at the size
Can you put that in a ticket ? https://issues.apache.org/jira/browse/CASSANDRA
Cheers
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 30/07/2013, at 12:52 AM, Keith Wright kwri...@nanigans.com wrote:
Version 1.2.4.
Original
This looks suspicious
SSTables in each level: [1, 3, 101/100, 1022/1000, 10587/1, 1750]
It says there are 6 levels in the levelled DB, which may explain why the number
of SSTables per read is so high.
It also says some of the levels have more files than they should, check
nodetool
I don't think these are exposed by any nodetool commands though, but you can
use any JMX client to read them.
They are sort of shown by nodetool proxyhistograms though not in aggregate.
Cheers
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
[30/07/2013 00:04:50] Read Exception (Thread: 5007; Host: 10.191.54.26):
TimedOutException()
it means the cluster is over loaded or suffered a failure while processing a
request. A well behaved client should retry the request so long as counters are
not being used.
Your request went to a
You'll get better Ops Centre support on the DS site
http://www.datastax.com/support-forums/
cheers
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 30/07/2013, at 9:23 PM, Alain RODRIGUEZ arodr...@gmail.com wrote:
I also see
Hi, I am also interested on the use cases where custom indexes are useful.
Alain
2013/7/31 baskar.duraikannu...@gmail.com
Hello,
Both Cassandra CLI and CQLSH have option to specify an custom index. Can
you point to an example custom index implementation, if there is one?
Thanks
Baskar
Hi,
On Mon, Jul 29, 2013 at 11:23 AM, aaron morton aa...@thelastpickle.com wrote:
The error is because the underlying CF is not defined using a composite type
for the comparator.
CREATE TABLE RRD (
key text,
column1 blob,
value blob,
PRIMARY KEY (key, column1)
) WITH COMPACT STORAGE
Here is the pointer to the topic on the DS support forum.
http://www.datastax.com/support-forums/topic/some-32-bugs-reported-in-the-c-user-ml
2013/7/31 aaron morton aa...@thelastpickle.com
You'll get better Ops Centre support on the DS site
http://www.datastax.com/support-forums/
cheers
I thought that part of the point of Cassandra was that, unlike a
standard relational database, each row does not have to have the same
set of columns. I don't understand how this squares with CQL. If I want
to have a table (column family?) with a few fixed columns that are
relevant to every row, I
I like to point to this article from Sylvain, which is really well written.
http://www.datastax.com/dev/blog/thrift-to-cql3
It explains a lot of things and is really interesting for Cassandra users
pre-CQL3.
Actually, old dynamic columns were defined this way :
CREATE TABLE test (
key
Oops, sorry about double post.
Alain
2013/7/31 Alain RODRIGUEZ arodr...@gmail.com
I like to point to this article from Sylvain, which is really well written.
http://www.datastax.com/dev/blog/thrift-to-cql3
It explains a lot of things and is really interesting for Cassandra users
Created https://issues.apache.org/jira/browse/CASSANDRA-5834
From: aaron morton aa...@thelastpickle.commailto:aa...@thelastpickle.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday, July 31, 2013 5:11
Thank you for the response. Compactionstats does not indicate that we are
running behind (see below). FYI - since making the change from default 5
to 256 MB I have been seeing increased GC pauses (one node got locked in
GC spirals last night and had to be restarted) so I actually decreased the
I'm using AWS's EMR (hadoop as a service), and one step copies some data
from EMR - my cassandra cluster. I used to patch EMR with pig 0.11, but
now AWS officially supports 0.11, so I thought I'd give it a try. I was
having issues. The AWS forum on it is here:
Hi Jan,
One question...you say
- I must make sure the disks are directly attached, to prevent
problems when multiple nodes flush the commit log at the
same time
What do you mean by that?
Thanks,
Shahab
On Wed, Jul 31, 2013 at 3:10 AM, Jan Algermissen jan.algermis...@nordsc.com
wrote:
Hi Shahab,
On 31.07.2013, at 15:59, Shahab Yunus shahab.yu...@gmail.com wrote:
Hi Jan,
One question...you say
- I must make sure the disks are directly attached, to prevent
problems when multiple nodes flush the commit log at the
same time
I read that using Cassandra with SANs can
Hi all,
I need to limit a MapReduce job to only scan a specific range of columns.
The CF being processed is a wide row, so I've set the 'widerow' property in
ConfigHelper.setInputColumnFamily() to true.
However, in the word_count example on github, the following comment exists:
// this will
On Wed, Jul 31, 2013 at 02:21:52PM +0200, Alain RODRIGUEZ wrote:
I like to point to this article from Sylvain, which is really well
written.
http://www.datastax.com/dev/blog/thrift-to-cql3
Ah, thankyou, it looks like a combination of multi-column PRIMARY KEY
and use of collections may
Actually, it was pointed out to me that there's a comment in
org.apache.cassandra.service.StorageProxy#cas() that says:
// finish the paxos round w/ the desired updates
// TODO turn null updates into delete?
Commit proposal = Commit.newProposal(key, ballot,
You should also profile what your data looks like on disk before picking a
format. It may not be as efficient to use one form or the other due to
extra disk overhead.
On Wed, Jul 31, 2013 at 1:32 PM, Jon Ribbens
jon-cassan...@unequivocal.co.uk wrote:
On Wed, Jul 31, 2013 at 02:21:52PM +0200,
It's advised you do not use compact storage, as it's primarily for
backwards compatibility.
The first of these option is COMPACT STORAGE. This option is meanly
targeted towards backward compatibility with some table definition created
before CQL3. But it also provides a slightly more compact
What is Paxos used for? Only CAS related operations?
On Wed, Jul 31, 2013 at 3:50 PM, Bill Hastings bllhasti...@gmail.comwrote:
What is Paxos used for? Only CAS related operations?
I believe so, yes.
https://issues.apache.org/jira/browse/CASSANDRA-5062
=Rob
Hi All
We are using Cassandra 1.2.4 and are seeing the following error loading a
pretty small amount of data.
Exception in thread main java.lang.OutOfMemoryError: Java heap space
at org.apache.cassandra.utils.obs.OpenBitSet.init(OpenBitSet.java:76)
at
thanks Alain
I don’t know why not permited to create topic on datastax forum.
发件人: Alain RODRIGUEZ [mailto:arodr...@gmail.com]
发送时间: 2013年7月31日 18:11
收件人: user@cassandra.apache.org
主题: Re: two problems about opscenter 3.2
Here is the pointer to the topic on the DS support forum.
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