The thrift client is just auto generated code, if you really wanted to you may
be able to change / override it to modify the SerDe when it pulls things off
the wire.
Not sure if this does what you are looking for
https://issues.apache.org/jira/browse/CASSANDRA-2478
Cheers
-
Outbound messages for other DC's are grouped and a single instance is sent to a
single node in the remote DC. The remote node then forwards the message on to
the other recipients in it's DC. All remote DC nodes will however reply
directly to the coordinator.
Normally this isn’t an issue for
For committed changes https://github.com/apache/cassandra/blob/trunk/CHANGES.txt
For interesting changer per release
https://github.com/apache/cassandra/blob/trunk/NEWS.txt
For the road map
Hi!
Thanks Aaron!
Today I restarted Cassandra on that node and ran scrub again, now it is
fine.
I am worried though that if I decide to change another CF to use
compression I will have that issue again. Any clue how to avoid it?
Thanks.
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
With both data centers functional, the test takes just a few minutes to run,
with one data center down, 15x the amount of time.
Could you provide the numbers, it's easier to get a feel for how the throughput
is dropping. Does latency reported by nodetool cf stats change ?
I'm also interested
#event, data = counter (date format
20121029).
2 - Is it a good Idea to compress this kind of data ?
I am looking for using composites columns.
3 - What are the benefits of using a column name like
CompositeType(UTF8Type, UTF8Type) and a simple UTF8 column with event and
date separated by a sharp as I
Does CQL3 not allow dynamic columns (column names) any more?
CQL3 does absolutely allow dynamic column families, but does it
differently from CQL2. See
http://www.datastax.com/dev/blog/cql3-for-cassandra-experts.
--
Sylvain
On Mon, Oct 29, 2012 at 12:34 PM, Timmy Turner timm.t...@gmail.com wrote:
Does CQL3 not allow dynamic columns (column names) any
Thank you! That article helps clear up a lot of my confusion about the
changes between CQL 2 and 3, since I was wondering how to
access/manipulate CompositeType/DynamicCompositeType columns through
CQL.
So does this mean that in CQL 3 an explicit schema is absolutely
mandatory? It's now
Answering myself: it seems we can't have any non type 1 UUIDs in column
names. I used the UTF8 comparator and saved my UUIDs as strings, it worked.
2012/10/29 Marcelo Elias Del Valle mvall...@gmail.com
Hello,
I am using ColumnFamilyInputFormat the same way it's described in this
example:
Marcelo,
das vezes q tive este problema geralmente era porque o valor UUID sendo
tratado para o cassandra não correspondia a um valor exato em UUID, para
isso utilizava bastante o UUID.randomUUID() (para gerar um UUID valido)
e UUID.fromString(081f4500-047e-401c-8c0b-a41fefd099d7) - este para
Hmm, this brings the question of what uuid libraries are others using? I know
this one generates type 1 UUIDs with two longs so it is 16 bytes.
http://johannburkard.de/software/uuid/
Thanks,
Dean
From: Marcelo Elias Del Valle mvall...@gmail.commailto:mvall...@gmail.com
Reply-To:
Thanks, extremely helpful. The key bit was I wasn't flushing the old
Keyspace before re-running the stress test, so I was stuck at RF = 1 from a
previous run despite passing RF = 2 to the stress tool.
On Sun, Oct 28, 2012 at 2:49 AM, Peter Schuller peter.schul...@infidyne.com
wrote:
Operation
Dean,
Are type 1 UUIDs the best ones to use if I want to avoid conflict? I
saw this page: http://en.wikipedia.org/wiki/Universally_unique_identifier
The only problem with type 1 UUIDs is they are not opaque? I know
there is one kind of UUID that can generate two equal values if you
Err... Guess you replied in portuguese to the list :D
2012/10/29 Andre Tavares andre...@gmail.com
Marcelo,
das vezes q tive este problema geralmente era porque o valor UUID sendo
tratado para o cassandra não correspondia a um valor exato em UUID, para
isso utilizava bastante o
This is how cassandra scales. More nodes means better performance.
thank you,
Andrey
On Mon, Oct 29, 2012 at 2:57 PM, Roshan codeva...@gmail.com wrote:
Hi All
This may be a silly question, but what kind of benefits we can get by adding
new nodes to the cluster?
Some may be high
I'm running 1.1.5; the bug says it's fixed in 1.0.9/1.1.0.
How can I check to see why it keeps running HintedHandoff?
Steve
-Original Message-
From: Brandon Williams [mailto:dri...@gmail.com]
Sent: Wednesday, October 24, 2012 4:56 AM
To: user@cassandra.apache.org
Subject: Re: Hinted
Dne 29.10.2012 23:24, Stephen Pierce napsal(a):
I'm running 1.1.5; the bug says it's fixed in 1.0.9/1.1.0.
How can I check to see why it keeps running HintedHandoff?
you have tombstone is system.HintsColumnFamily use list command in
cassandra-cli to check
For a server with 4 drive slots only, I'm thinking:
either:
- OS (1 drive)
- Commit Log (1 drive)
- Data (2 drives, software raid 0)
vs
- OS + Data (3 drives, software raid 0)
- Commit Log (1 drive)
or something else?
also, if I can spare the wasted storage, would RAID 10 for cassandra data
Any clue how to avoid it?
Not really sure what went wrong. Diagnosing that sort of problem usually takes
access to the running node and time to poke around and see what it does in
responses to various things.
Rebooting works for Windows 95 and Cassandra is not that different.
Cheers
I'm not sure whether the raid 0 gets you anything other than headaches
should one of the drives fail. You can already distribute the
individual Cassandra column families on different drives by just
setting up symlinks to the individual folders.
2012/10/30 Ran User ranuse...@gmail.com:
For a
More background http://www.datastax.com/dev/blog/thrift-to-cql3
So does this mean that in CQL 3 an explicit schema is absolutely
mandatory?
Not really, it sort of depends on your view.
Lets say this is a schema free CF definition in CLI
create column family clicks
with
I was hoping to achieve approx. 2x IO (write and read) performance via RAID
0 (by accepting a higher MTBF).
Do believe the performance gains of RAID0 are much lower and/or are not
worth it vs the increased server failure rate?
From my understanding, RAID 10 would achieve the read performance
Have you considered running RAID 10 for the data drives to improve MTBF?
On one hand Cassandra is handling redundancy issues, on the other
hand, reducing the frequency of dealing with failed nodes
is attractive if cheap (switching RAID levels to 10).
We have no experience with software RAID
Hi,
I'm currently benchmarking Cassandra and have encountered some interesting
behavior. As I increase the number of client threads (and connections),
latency increases as expected but, at some point, throughput actually
decreases.
I've seen a few posts about this online, with no clear
I'm using YCSB on EC2 with one m1.large instance to drive client load
To add, I don't believe this is due to YCSB. I've done a fair bit of
client-side profiling and neither client CPU or NIC (or server NIC) are
bottlenecks.
I'll also add that this dataset fits in memory.
Thanks!
Peter
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