Unfortunately ssd drives are no option at the moment. I have to use 2
regular hds. Has anyone tried above scenario?
THanks,
Thibaut
On Fri, Aug 10, 2012 at 3:30 PM, Radim Kolar h...@filez.com wrote:
I was thinking about putting both the commit log and the data directory
on a software raid
Hi,
I am new to Cassandra and trying to understand whether it's a good fit for
my problems. So here is a case from my domain:
Assume that we're storing session events of users in composite columns
within a column family partitioned by user id. This is from an example
given about composite
Having the both the commit log and data directory on the same volume is
generally not recommended. You would actually see a performance decrease
unless you can have most your reads be cache hits.
On Friday, August 10, 2012, Thibaut Britz wrote:
Hi,
Has anyone of you made some experience with
Hi there,
I currently see Cassandra crash every couple of days. I run a 3 node
cluster on version 1.1.2. Does anyone have a clue why it crashes? I
couldn't find it as fix in a newer release. Is this an actual bug or did I
do something wrong?
Thank you in advance for your time.
Last 100 log
So how does that work? An sstable is for a single CF, but it can and
likely will have multiple rows. There is no read to write and as I
understand it, writes are append operations.
So if you have an sstable with say 26 different rows (A-Z) already in
it with a bunch of columns and you add a new
Aaron,
I have not deep dived the data files in a while but this is how I understand it.
http://wiki.apache.org/cassandra/ArchitectureSSTable
There is no need to store the row key each time with the column.
RowKey to columns is a one to many relationship. This would be a
diagram of a physical
Thanks Russell, that's the info I was looking for!
On Sat, Aug 11, 2012 at 11:23 AM, Russell Haering
russellhaer...@gmail.com wrote:
Your update doesn't go directly to an sstable (which are immutable),
it is first merged to an in-memory table. Eventually the memtable is
flushed to a new
One node can typically handle 30k+ inserts per second, so you should be
able to insert the 9 million rows in about 5 minutes with a single node
cluster. My guess is that you're inserting with a single thread, which
means you're bound by network latency. Try using 100 threads, or better,
just use
We've seen something similar when running on a 32bit JVM, so make sure
you're using the latest 64bit Java 6 JVM.
On Sat, Aug 11, 2012 at 11:59 AM, Robin Verlangen ro...@us2.nl wrote:
Hi there,
I currently see Cassandra crash every couple of days. I run a 3 node
cluster on version 1.1.2. Does
On Fri, Aug 10, 2012 at 4:29 PM, Dwight Smith
dwight.sm...@genesyslab.comwrote:
Further info – it seems I had the seeds list backwards – it did not need
both nodes – I have corrected that with each pointing to the other as a
single seed entry – and it works fine.
This might have worked by
On Tue, Aug 7, 2012 at 2:32 AM, Baskar Sikkayan baskar@gmail.comwrote:
If i create one more column family based on my query instead of going with
secondary index,
Will it affect the write performance?
It won't affect writes much more than the built-in secondary indexes would,
and you'll
As far as I know, assume isn't a CQL feature, it's only part of
cassandra-cli.
On Tue, Aug 7, 2012 at 10:16 PM, Jason Hill jasonhill...@gmail.com wrote:
Hello,
I'm using:
[cqlsh 2.0.0 | Cassandra 1.0.10 | CQL spec 2.0.0 | Thrift protocol 19.20.0]
I have a column family with a key that is
On Wed, Aug 8, 2012 at 8:58 PM, Ben Kaehne ben.kae...@sirca.org.au wrote:
Our application runs on a 3 node cassandra cluster with RF of 3.
We use quorum operations against this cluster in hopes of garunteeing
consistency.
One scenario in which an issue can occur here is:
Out of our 3
Usually when you're using the packaged installations, you want to start
cassandra with:
sudo sevice cassandra start
On Thu, Aug 9, 2012 at 4:18 AM, Ahmed Ababne ahmedabab...@yahoo.com wrote:
Hi
I am running 12.04 Ubuntu, and had cassandra ubuntu packaged installation.
I have just upgraded
Sounds like bad behavior. Can you open a JIRA ticket for that (once jira
is back up :) ?
On Thu, Aug 9, 2012 at 9:14 AM, Mat Brown m...@brewster.com wrote:
Hello,
We've noticed that when passing multiple -k arguments to the
sstable2json utility, we pretty much always get an IOException with
There have been some commitlog-related fixes in later versions of 1.1, so
it's worth trying an upgrade. If that doesn't resolve the issue, open a
JIRA ticket with these details.
On Thu, Aug 9, 2012 at 9:15 AM, Kasun Weranga kas...@wso2.com wrote:
Any idea on how to fix this?
Thanks,
Kasun
On Thu, Aug 9, 2012 at 10:43 AM, Cyril Auburtin cyril.aubur...@gmail.comwrote:
It seems the Thrift method *batch-mutate*, with Mutations, will not
update the previous data with the mutation given, but clear and replace by
it? right?
I'm not sure what you're asking. Writes in Cassandra are
Yes, if you're using RandomPartitioner. The hash is md5.
On Thu, Aug 9, 2012 at 1:29 PM, A J s5a...@gmail.com wrote:
Are row key hashed before being physically stored in Cassandra ? If
so, what hash function is used to ensure collision is minimal.
Thanks.
--
Tyler Hobbs
DataStax
You can use something like the maven shade plugin to use both of the
libthrift jars.
On Thu, Aug 9, 2012 at 3:57 PM, Jose Flexa jose.fl...@gmail.com wrote:
Hi.
I´ve avoided the issue by disabling assertions (-da). Any suggestions
on a better strategy?
Thanks
José
On Thu, Aug 9, 2012 at
There is a fair amount of overhead in the Thrift structures for columns and
mutations, so that's a pretty large mutation.
In general, you'll see better performance inserting many small batch
mutations in parallel.
On Fri, Aug 10, 2012 at 2:04 AM, Jin Lei jehovah.l...@gmail.com wrote:
Sorry,
On Fri, Aug 10, 2012 at 5:54 AM, Fredrik
fredrik.l.stigb...@sitevision.sewrote:
We've had a bug that caused one of our column families to grow very big
280 GB on a 500 GB disk. We're using size tiered compaction.
Since it's only append data I've now issued deletes of 260 GB of
superflous
Make sure that your seed list is the same for every node. Just pick two of
the three nodes and use those as the seeds everywhere.
If that's not the issue, check your cassandra log to see if there are any
exceptions during startup.
On Fri, Aug 3, 2012 at 5:25 PM, Edward Sargisson
22 matches
Mail list logo
