On Mon, Feb 20, 2012 at 12:00 PM, aaron morton aa...@thelastpickle.comwrote:
Aside from iostats..
nodetool cfstats will give you read and write latency for each CF. This is
the latency for the operation on each node. Check that to see if latency is
increasing.
Take a look at nodetool
Hi all
I am running the Apache packaged Cassandra 1.0.7 on Ubuntu 11.10.
It has been running fine for over a month however I encountered the below
error yesterday which almost immediately resulted in heap usage rising
quickly to almost 100% and client requests timing out on the affected node.
I
I noticed a strange phenomenon with Cassandra, and I would like to know
if this is something completely impossible, or not.
As you can see in the log extract below, as new versions of a row is
written out, the reads returns obsolete data after a while (they read
version 78 when 79 and even 80
The appearance of the old rows were caused by old timestamps set on
columns (which in turn caused by some ThreadLocals which were not
cleaned up). Since I fixed the timestamp, all rows returned corresponds
to their latest saved state in each and every case.
On 2012.02.20. 13:32, Hontvári
Hi!
When setting ttl on columns, is there a maximum value (other than
MAXINT, 2**31-1) that can be used?
I have a very odd behaviour here, where I try to set ttl to 9 622 973
(~111 days) which works, but setting it to 11 824 305 (~137 days) does
not - it seems columns are deleted instantly
Hi All,
I have setup 3 nodes Cassandra cluster(cassandra version is 0.7). In the
code base I am creating few column families using Hector client with
default consistency level and the replication factor of key space is 2.
While running the code I am getting following exception repeatedly on
@Tamar: Thanks a ton! works perfect now!
On Mon, Feb 20, 2012 at 12:02 PM, Tamar Fraenkel ta...@tok-media.comwrote:
On 19/02/2012 21:55, Aditya Gupta wrote:
Is there anything to do with running cassandra on a VMware ubuntu instance
!? I am trying Cassandra on VMware ubuntu server instance.
Question pertaining to wide or large rows in Cassandra. I recall reading in
a blog I believe posted by Aaron Morton a notation that Cassandra creates
its own index of a row when it reaches X amount of columns? My curiosity
is:
A.) At what column count does this happen?
B.) If Thrift is only
The Cassandra team is pleased to announce the release of the first beta for
the future Apache Cassandra 1.1.
Let me first stress that this is beta software and as such is *not* ready for
production use.
The goal of this release is to give a preview of what will become Cassandra
1.1 and to get
If you want to read all possible values for a field, where the field has 1
million possible values it's going to take time. No matter what data model you
use.
That said, the first model I would use is:
CF: Customer
Use this as a canonical record of the properties a customer has.
row_key :
Can you provide the definition for the PlayerCity CF, the client you are using
and any other info about the mutation ?
It's a strange looking mutation. There are a lot of super columns are not
marked for delete and do not have nay columns in them.
The error occurred because it took 3 bytes
Nothing obvious.
Trying turning up the logging to DEBUG and watch what happens, or use
sstable2json to dump the sstables. Expired columns are not purged until the
sstable is compacted.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On
If you are starting out I recommend using at least 0.8, the memory management
will make you life so much easier.
if the schema is not fully replicated solve that problem first. Using
cassandra-cli and run the describe cluster command. If there are multiple
schemas listed nuke it and start
this http://thelastpickle.com/2011/07/04/Cassandra-Query-Plans/
A.) At what column count does this happen?
Based on column serialised size
https://github.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L325
B.) If Thrift is only getting slices of a large row (column_start=X,
Thanks a lot Aaron,
I will try your idea tomorow.
For CF PropertyValues, instead of property_value:customer_id should I do
customer_id:property_value to preserve the same order for each property_value
? (there will be custom null value).
Why is using only columns names faster ? It seems that
--
Thanks.
Bhupendra B Babu
I believe you will see a slight unbalance regardless of your RF with very
wide rows, if they are of varying sizes. one node may get a very wide row and
another node may get a not so wide row. it's all based on the key.
From: aaron morton aa...@thelastpickle.commailto:aa...@thelastpickle.com
http://goo.gl/lQJC2
On Mon, Feb 20, 2012 at 3:39 PM, Bhupendra Babu bb...@apple.com wrote:
--
Thanks.
Bhupendra B Babu
--
Eric Evans
Acunu | http://www.acunu.com | @acunu
When I read the cassandra code, there are too many deep clone operation. Is
there any risk of OutOfMemoryException? When flushing the memtable to disk,
there is a deep clone, and when the disk is slow down, this will lead to a
severe OOM.
Am I right?
Thanks.
2012-02-21
zhangcheng
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