Hello
Too much GC? Check JVM heap settings and real usage.
On 06/27/2012 01:37 AM, Dustin Wenz wrote:
We occasionally see fairly poor compaction performance on random nodes in our
7-node cluster, and I have no idea why. This is one example from the log:
[CompactionExecutor:45]
Last I heard only Oracle's JDK was officially supported with Cassandra,
possibly nitpicky but is this still the case?
On Jun 26, 2012, at 3:37 PM, Dustin Wenz wrote:
(OpenJDK 7) was pegged at 200% CPU
What is your yaml setting for rpc and listen server on destination node?
Nury
Tue, 26 Jun 2012 17:07:49 -0700 от James Pirz james.p...@gmail.com:
Dear all,
I am trying to use sstableloader in cassandra 1.1.1, to bulk load some data
into a single node cluster.
I am running the
You should read this page for
settings http://www.datastax.com/dev/blog/caching-in-cassandra-1-1
Basically, you have to set row_cache size in yaml, and create table with
caching flags - all or
rows_only, but beware that you shouldn't use row cache, if you using wide rows.
Tue, 26 Jun 2012
, but I do not
understand the remedy to the problem.
Is increasing this variable my only option?
There is nothing to be fixed. This is Cassandra flushing data to disk to free
memory and checkpoint the commit log.
I see memtables of serialized size of 100-200 MB with estimated live
size of
Fat clients aren't involved in writes or HH, and I think my previous thought
about it having some info in the System KS may be wrong.
Can you recreate the issue ? Care to raise a ticket on
https://issues.apache.org/jira/browse/CASSANDRA ?
Thanks
-
Aaron Morton
Freelance
On Wed, Jun 27, 2012 at 2:27 PM, aaron morton aa...@thelastpickle.com wrote:
, but I do not
understand the remedy to the problem.
Is increasing this variable my only option?
There is nothing to be fixed. This is Cassandra flushing data to disk to
free memory and checkpoint the commit log.
Had a quick look, the current master does not appear to support it.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 26/06/2012, at 7:46 AM, Thierry Templier wrote:
Hello,
How can I enable CQL3 support in Astyanax? Thanks very much for
Setting up a Cassandra ring across NAT ( without a VPN ) is impossible in my
experience.
The broadcast_address allows a node to broadcast an address that is different
to the ones it's bound to on the local interfaces
https://github.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L270
Aaron,
The broadcast_address allows a node to broadcast an address that is different
to the ones it's bound to on the local interfaces
https://github.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L270
Yes and thats not where the problem is IMO.. If you broadcast your translated
address
CASSANDRA-3954 disabled caches on secondary index CF's in 1.1.0 and
CASSANDRA-4197 enabled it in 1.1.1
Can you create a ticket on https://issues.apache.org/jira/browse/CASSANDRA
I guessing this has something to do with the local partitioner used for the
secondary index Cf. That would explain
Hello Aaron,
Thanks very much for your answer!
Could you give me some hints on how implement that? So I could
contribute a patch for that.
After having a look at the Astyanax code, I saw that CQL is executed in
the ThriftColumnFamilyQueryImpl class based on the
Therefore I was wondering if Cassandra already intelligently optimizes
for HH-over-WAN (since this is common) or alternately if there's a way
to enable HH for WAN replication?
When the coordinator is preparing to process the request, done nodes in a
foreign DC are treated like down nodes in a
Hi,
I'm trying to do the following : update keyspace.CF set '2' = '2' + 12
WHERE KEY = 'mykey';
And got this answer: Bad Request: cannot parse 'mykey' as
hex bytes
Using this doesn't help: assume keyspace.CF(KEY) VALUES ARE
text; (Found here
Hello Aaron,
I created an issue on the Astyanax github for this problem. I added a
fix to support CQL3 in the tool.
See the link https://github.com/Netflix/astyanax/issues/75.
Thierry
Had a quick look, the current master does not appear to support it.
Cheers
Great stuff!!!
On Tue, Jun 26, 2012 at 5:25 PM, Edward Capriolo edlinuxg...@gmail.comwrote:
Hello all,
It has not been very long since the first book was published but
several things have been added to Cassandra and a few things have
changed. I am putting together a list of changed content,
Hi there,
Today I found one node (running 1.1.1 in a 3 node cluster) being dead for
the third time this week, it died with the following message:
ERROR [ReadRepairStage:3] 2012-06-27 14:28:30,929
AbstractCassandraDaemon.java (line 134) Exception in thread
Thread[ReadRepairStage:3,5,main]
Hi Edward,
Looking forward to your book. It's always interesting to read what others
have to say about a certain subject, and hopefully even learn new things!
2012/6/27 Raj N raj.cassan...@gmail.com
Great stuff!!!
On Tue, Jun 26, 2012 at 5:25 PM, Edward Capriolo edlinuxg...@gmail.comwrote:
Hey Edward,
I finally posted my (short) blog post on using Hector with Jruby:
http://synfin.net/sock_stream/technology/code/cassandra-hector-jruby-awesome
If you're interested in documenting that more in detail in your book,
let me know and I can help you with that in your book if you'd like.
On Wed, Jun 27, 2012 at 1:42 AM, Derek Andree dand...@lacunasystems.comwrote:
Last I heard only Oracle's JDK was officially supported with Cassandra,
possibly nitpicky but is this still the case?
On Jun 26, 2012, at 3:37 PM, Dustin Wenz wrote:
(OpenJDK 7) was pegged at 200% CPU
Java 7
Thank you so much !
The problem was the RPC address, it was different than the listen address.
I appreciate your help.
Best,
James
On Wed, Jun 27, 2012 at 1:29 AM, Nury Redjepow nreje...@mail.ru wrote:
What is your yaml setting for rpc and listen server on destination node?
Nury
Tue, 26
Sounds good.
One thing I'd like to see is more coverage on Cassandra Internals. Out of
the box Cassandra's great but having a little inside knowledge can be very
useful because it helps you design your applications to work with
Cassandra; rather than having to later make endless optimizations that
On Wed, Jun 27, 2012 at 3:08 PM, Courtney Robinson court...@crlog.info wrote:
Sounds good.
One thing I'd like to see is more coverage on Cassandra Internals. Out of
the box Cassandra's great but having a little inside knowledge can be very
useful because it helps you design your applications
RE: API method signatures changing
That triggers another thought...
What terminology will you use in the book to describe the data model? CQL?
When we wrote the RefCard on
DZonehttp://refcardz.dzone.com/refcardz/apache-cassandra,
we intentionally favored/used CQL terminology. On advisement
Hi,
We have a production cluster with few nodes in each data center. Each node
is being contacted in each data center to serve front end requests. I have
a question about the method adding new nodes to the cluster (say, to
improve RF or scalability). AFAIK, there are two methods to do this.
1.
On Wed, Jun 27, 2012 at 4:34 PM, Brian O'Neill b...@alumni.brown.edu wrote:
RE: API method signatures changing
That triggers another thought...
What terminology will you use in the book to describe the data model? CQL?
When we wrote the RefCard on DZone, we intentionally favored/used CQL
Hi Eran,
As far as I'm aware of a node will not serve requests until the bootstrap
(starts automatically these days) has been completed. So the problem of #1
is not really there Solution #2 is not straight forward and easy to make
mistakes.
When you're concerned about read consistency use a
I'm looking forward to getting a few copies of this. Some areas that
would be great to cover
- Indexing strategies
- Configuring clients/env for sane timestamping
- Efficient CQL
- Top 8/10 perf issues/stacktraces and common resolutions
- understanding nodetool
Hi Edward,
That's a great news!
One thing I'd like to see in the new edition is Counters, known issues
and how to avoid them:
- avoid double counting (don't retry on failure, use write consistency
level ONE, use dedicated Hector connector?)
- delete counters (tricky, reset to zero?)
-
On Thu, Jun 28, 2012 at 7:32 AM, Edward Capriolo edlinuxg...@gmail.comwrote:
On Wed, Jun 27, 2012 at 4:34 PM, Brian O'Neill b...@alumni.brown.edu
wrote:
RE: API method signatures changing
That triggers another thought...
What terminology will you use in the book to describe the data
On Wed, Jun 27, 2012 at 1:34 PM, Brian O'Neill b...@alumni.brown.edu wrote:
RE: API method signatures changing
That triggers another thought...
What terminology will you use in the book to describe the data model? CQL?
When we wrote the RefCard on DZone, we intentionally favored/used CQL
Dear all,
I am interested in using Cassandra 1.1.1 in a read-intensive scenario,
where more than 95% of my operations are get().
I have a cluster with ~10 nodes, around 15-20 GB of data on each, while in
the extreme case I expect to have 20-40 concurrent clients.
I am kind of confused about
Hello
We are using Hector and it perfectly matching to our case.
https://github.com/hector-client/hector
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