compaction needs some disk I/O. Slowing down our compaction will improve
overall system performance. Of course, you don't want to go too slow and fall
behind too much.
-Wei
- Original Message -
From: "Dane Miller"
To: user@cassandra.apache.org
Cc: "Wei Zhu"
Sent: Friday, March 22, 201
On Thu, Mar 21, 2013 at 10:28 AM, aaron morton wrote:
> heap of 1867M is kind of small. According to the discussion on this list,
> it's advisable to have m1.xlarge.
>
> +1
>
> In cassadrea-env.sh set the MAX_HEAP_SIZE to 4GB, and the NEW_HEAP_SIZE to
> 400M
>
> In the yaml file set
>
> in_memory_
Just as a test - can you disable/reduce compaction throughput and see if that
makes a difference ? Compaction eats a lot of I/O.
From: zod...@fifth-aeon.net [mailto:zod...@fifth-aeon.net] On Behalf Of Jon
Scarborough
Sent: 22 March 2013 15:01
To: user@cassandra.apache.org; Wei Zhu
Subject: Re:
Ok. I always know the row key before I start the Cassandra read operation. A
full system could have 300-500k columns so secondary indexes don't seem a good
idea here. I think the best option will be to query a range of columns for the
given row key.
Thanks a bunch guys.
On Mar 20, 2013, at 11:2
Checked tpstats, there are very few dropped messages.
Checked histograms. Mostly nothing surprising. The vast majority of rows
are small, and most reads only access one or two SSTables.
What I did discover is that of our 5 nodes, one is performing well, with
disk I/O in the ballprk that seems rea
It's there:
http://www.datastax.com/docs/1.2/cluster_architecture/cluster_planning#node-init-config
It's a long document You need to look at the cassandra.yaml and
cassandra-env.sh and make sure you understand the settings there.
By the way, did datastax just face lift their document web s
According to your cfstats, read latency is over 100 ms which is really really
slow. I am seeing less than 3ms reads for my cluster which is on SSD. Can you
also check the nodetool cfhistorgram, it tells you more about the number of
SSTable involved and read/write latency. Somtimes average doesn'
Key distribution across probably varies a lot from row to row in our case.
Most reads would probably only need to look at a few SSTables, a few might
need to look at more.
I don't yet have a deep understanding of C* internals, but I would imagine
even the more expensive use cases would involve som
Index.db file always contains *all* position of the keys in data file.
index_interval is the rate that the position of the key in index file is store
in memory.
So that C* can begin scanning index file from closest position.
On Friday, March 22, 2013 at 11:17 AM, Hiller, Dean wrote:
> I was ju
Jabbar Azam gmail.com> writes:
>
>
>
>
>
>
> Oops, I also had opscenter installed on my PC.
> My changes
> log4j-server.properties file
log4j.appender.R.File=c:/var/log/cassandra/system.log
> cassandra.yaml file# directories w
I was just curious. Our RAM has significantly reduced but the *Index.db files
are the same size size as before.
Any ideas why this would be the case?
Basically, Why is our disk size not reduced since RAM is way lower? We are
running strong now with 512 index_interval for past 2-3 days and RAM
Oops, I also had opscenter installed on my PC.
My changes
log4j-server.properties file
log4j.appender.R.File=c:/var/log/cassandra/system.log
cassandra.yaml file
# directories where Cassandra should store data on disk.
data_file_
Viktor, you're right. I didn't get any errors on my windows console but
cassandra.yaml and log4j-server.properties need modifying.
On 22 March 2013 15:44, Viktor Jevdokimov wrote:
> You NEED to edit cassandra.yaml and log4j-server.properties paths before
> starting on Windows.
>
> There're a LOT
You NEED to edit cassandra.yaml and log4j-server.properties paths before
starting on Windows.
There're a LOT of things to learn for starters. Google for Cassandra on Windows.
Best regards / Pagarbiai
Viktor Jevdokimov
Senior Developer
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 306
Hello Marina,
I've downloaded a fresh copy of v1.2.3 and it's running fine on my Windows
7 64 bit PC. I am using jdk 1.6.0 u29 64 bit. I have local admin
permissions to my PC.
On 22 March 2013 15:36, Marina wrote:
>
> >
> > Hi,
> > I have downloaded apache-cassandra-1.2.3-bin.tar.gz and un-zip
Hello,
I've been experimenting with cassandra for quite a while now.
It's time for me to look at backups but I'm not sure what the best practice
is. I want to be able to recover the data to a point in time before any
user or software errors.
We will have two datacentres with 4 servers and RF=3.
>
> Hi,
> I have downloaded apache-cassandra-1.2.3-bin.tar.gz and un-zipped it on my
> Windows7 machine (I did not find a Windows-specific distributable...). Then,
> I
> tried to start Cassandra as following and got an error:
>
> C:\Marina\Tools\apache-cassandra-1.2.3\bin>cassandra.bat -f
>
Hi,
I have downloaded apache-cassandra-1.2.3-bin.tar.gz and un-zipped it on my
Windows7 machine (I did not find a Windows-specific distributable...). Then, I
tried to start Cassandra as following and got an error:
C:\Marina\Tools\apache-cassandra-1.2.3\bin>cassandra.bat -f
Starting Cassandra Se
Sorry...I meant to ask "is your key" spread across multiple sstables ? But with
LCS, your reads should ideally be served from one sstable most of the times..
-Original Message-
From: Hiller, Dean [mailto:dean.hil...@nrel.gov]
Sent: 22 March 2013 10:16
To: user@cassandra.apache.org
Sub
Did you mean to ask "are 'all' your keys spread across all SSTables"? I am
guessing at your intention.
I mean I would very well hope my keys are spread across all sstables or
otherwise that sstable should not be there as he has no keys in it ;).
And I know we had HUGE disk size from the duplic
Are your Keys spread across all SSTables ? That will cause every sstable read
which will increase the I/O.
What compaction are you using ?
From: zod...@fifth-aeon.net [mailto:zod...@fifth-aeon.net] On Behalf Of Jon
Scarborough
Sent: 21 March 2013 23:00
To: user@cassandra.apache.org
Subject: Hig
I'm running a Cassandra 1.1.10 cluster with a ByteOrderedPartitioner. I'm
generating a key to force an object to be stored in a specific machine.
When I used org.apache.cassandra.thrift.CassandraServer to store the
object, this object was stored on correct machine. When I used Thrift, the
key is ch
Thanks for the GC suggestion. It seems we didn't have enough CPU power to
handle both the data and GC. Increasing the number of CPU cores made
everything run smoothly at the same load.
2013/3/21 Andras Szerdahelyi
> Neat!
> Thanks.
>
> From: Sylvain Lebresne
> Reply-To: "user@cassandra.apac
Sorry, continued:
I have created a column family User with no parameters specified, just
create column family User.
Then I checked that the default comparator is BytesType.
Then I want to create secondary index on one column like below:
update column family User with column_metadata=[
Hello, guys:
I am new to Cassandra. I am currently using cassandra-cli(version
1.1.6).
Hi,
Yes I did.
I was a bit confused when reading your previous update on my cell phone.
I have 4 nodes and 2 seeds.
Regards Hans-Peter
From: Tyler Hobbs [mailto:ty...@datastax.com]
Sent: donderdag 21 maart 2013 17:17
To: user@cassandra.apache.org
Subject: Re: java.lang.IllegalStateException: N
26 matches
Mail list logo
