The Cassandra team is pleased to announce the release of Apache Cassandra
version 1.0.8.
Cassandra is a highly scalable second-generation distributed database,
bringing together Dynamo's fully distributed design and Bigtable's
ColumnFamily-based data model. You can read more here:
http://cassand
I'm running a 4 nodes cassandra cluster of VMware ubuntu instances each
768MB memory (on a single machine for development purposes). I need to
reduce heap size appropriately as my nodes have been crashing at times
with OOMs. How do I configure for this ? I think I would need to make some
tweaks wi
Hi
I'm creating an networking site using cassandra. I am wanting to host this
application but initially with the lowest possible resources & then slowly
increasing the resources as per the service's demand & need.
*1. *I am wandering *what is the minimum recommended cluster size to start
with*?
A
That sounds odd because it is checked after each row is added to the memtable.
What are you seeing logged when the memtable flushes ? It will say how many ops
and how many (tracked) bytes.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On
I guess the issue with 2 machines and RF=2 is that Consistency level of QUORUM
is the same as ALL, so you've pretty much have little flexibility with this
setup, of course this might be fine depending on what you want to do. In
addition, RF=2 also means that you get no data-storage improvements
To rule out the obvious problem can you check the nodes have the same schema ?
Use cassandra-cli and run describe cluster.
It looks like one of the nodes involved in the read has sent the wrong sort of
column for the CF. That's not the sort of thing that normally happens.
Otherwise are you abl
> Isn't decomission meant to do the same thing as disablethrift and gossip?
decommission removes a node entirely from the cluster, including streaming it's
data to other nodes.
disablethrift and disablegossip just stop it from responding to clients and
other nodes.
Cheers
-
yes, reducing commitlog_total_space_in_mb will reduce the amount of space
needed by the commit logs.
> memtable_total_space_in_mb
controls how often sstables are flushed to disk, this does not really affect
the commit log. Other than the fact that a commit log segment cannot be deleted
until t
What settings do you have for cassandra.range.batch.size and rpc_timeout_in_ms
? Have you tried reducing the first and/or increasing the second ?
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 27/02/2012, at 8:02 PM, Patrik Modesto wrote
MAX_HEAP_SIZE="500M"
HEAP_NEWSIZE="100M"
That is a very small amount of memory for java, you are probably going to have
problems. Take a look at reducing these settings in cassandra.yaml to reduce
the amount of memory used.
memtable_total_space_in_mb
memtable_flush_queue_size
in_memory_compact
> 1. I am wandering what is the minimum recommended cluster size to start with?
IMHO 3
http://thelastpickle.com/2011/06/13/Down-For-Me/
A
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 28/02/2012, at 8:17 AM, Ertio Lew wrote:
> Hi
>
> I'm crea
Hi Experts
After getting an OOM error in production, I reduce the
-XX:CMSInitiatingOccupancyFraction to .45 (from .75) and
flush_largest_memtables_at to .45 (from .75). But still I am get an warning
message in production for the same Cassandra node regarding OOM. Also reduce
the concurrent compact
Take a heap dump (there should be one from when you OOMed) and see
what is consuming your memory.
On Mon, Feb 27, 2012 at 3:45 PM, Roshan wrote:
> Hi Experts
>
> After getting an OOM error in production, I reduce the
> -XX:CMSInitiatingOccupancyFraction to .45 (from .75) and
> flush_largest_memta
What does the heap dump show is using the memory?
On Fri, Feb 24, 2012 at 3:14 PM, Feng Qu wrote:
> Hello,
>
> We have a 6-node ring running 0.8.6 on RHEL 6.1. The first node also runs
> OpsCenter community. This node has crashed few time recently with
> "OutOfMemoryError: Java heap space" while
As a configuration issue, I haven't enable the heap dump directory.
Is there another way to find the cause to this and identify possible
configuration changes?
Thanks.
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Cassndra-1-0-6-GC-query-tp73
GridFS for Cassandra here, take it FWIW. AFAIK Joaquin spent a few hours
putting this together at most.
https://github.com/joaquincasares/gratefs
--
Ben Coverston
DataStax -- The Apache Cassandra Company
Heap dump is really the gold standard for analysis, but if you don't want
to take a heap dump for some reason:
1. Decrease the cache sizes
2. Increase the index interval size
These in combination may reduce pressure on the heap enough so you do not
see these warnings in the log.
On Mon, Feb 27,
Hi!
I have a column family where I use rows as "time buckets".
What I do is take epoc time in seconds, and round it to 1 hour (taking the
result of time_since_epoc_second divided by 3600).
My key validation type is LongType.
I wonder whether it is better to use TimeUUID or even readable string
repr
Using a user/member as an example I am curious which of the data models
would be the best fit for performance and longevity of data in Cassandra?
Consider the simple staples of user/member details like
username,email,address,state,preferences,etc. Fairly simple, storing this
data into a row key us
Hi,
does anyone know of a picture/image that shows the layout of
keys/columns/values in an sstable - I haven't been able to find one and am
having a hard time visualising the layout from various descriptions and
various overviews
thanks
--
*Franc Carter* | Systems architect | Sirca Ltd
fran
Hi aaron,
this is our current settings:
cassandra.range.batch.size
1024
cassandra.input.split.size
16384
rpc_timeout_in_ms: 3
Regards,
P.
On Mon, Feb 27, 2012 at 21:54, aaron morton wrote:
> What settings do you have for
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