Cassandra also uses a bunch of classes that are new in JDK6.
JDK5 is end-of-lifed, time to let it rest in piece.
On Thu, Jun 16, 2011 at 10:41 PM, aaron morton aa...@thelastpickle.com wrote:
The Thrift Java compiler creates code that is not compliant with Java 5.
Replication location is determined by the row key, not the location of
the client that inserted it. (Otherwise, without knowing what DC a
row was inserted in, you couldn't look it up to read it!)
On Fri, Jun 17, 2011 at 12:20 AM, AJ a...@dude.podzone.net wrote:
On 6/16/2011 9:45 PM, aaron
jsvc is not very flexible. Check out wrapper software out. we swear by it.
http://wrapper.tanukisoftware.com/doc/english/download.jsp
On Jun 17, 2011, at 2:52 AM, Ken Brumer wrote:
Anton Belyaev anton.belyaev at gmail.com writes:
I guess it is not trivial to modify the package to make
All:
Can you find some exception from the last sentence? Would cassandra crash when
memory is not enough? There are some other application run with cassandra, the
other application may use large memory.
发件人: Donna Li
发送时间: 2011年6月17日 9:58
收件人:
The short answer to the problem you saw is monitor the disk space. Also monitor
client side logs for errors. Running out of commit log space does not stop the
node from doing reads, so it can still be considered up.
One nodes view of it's own UP'ness is not as important as the other nodes (or
What do you mean by crash ?
If there was some sort of error in cassandra (including java running out of
heap space) it will appear in the logs. Are there any error messages in the log.
If there was some sort of JVM error it will be outputted to std error and
probably end up on std out /
I have a query:
I have my Cassandra server running on my local machine and it has loaded
Cassandra specific settings from
apache-cassandra-0.8.0-src/apache-cassandra-0.8.0-src/conf/cassandra.yaml
Now If I am writing a java program to connect to this server why do I need to
provide a new
What type of environment? We had issues with our cluster on 0.7.6-2 ... The
messages you see and highlighted, from what I recall aren't bad ... they are
good. Investigating our crash, it turns out that the OS killed our
Cassandra process and this was found in /var/log/messages
Since then, I
Hi Vivek,
When I write client code in Java, using Hector, I don't specify a
cassandra.yaml ... I specify the host(s) and keyspace I want to
connect to. Alternately, I specify the host(s) and create the
keyspace if the one I would like to use doesn't exist (new cluster for
example). At no point
Since using cassandra 0.8, I see the following warning:
WARN 12:05:59,807 MemoryMeter uninitialized (jamm not specified as java agent);
assuming liveRatio of 10.0. Usually this means cassandra-env.sh disabled jamm
because you are using a buggy JRE; upgrade to the Sun JRE instead
I'am using
My commit logs sometimes eat too much disk space. I see that the oldest is
about a day old, so it's clearly pruning already, but is there some way I can
clear them out manually without breaking stuff, assuming that all the
transactions they describe have been completed?
Marcus
smime.p7s
My commit logs sometimes eat too much disk space. I see that the oldest is
about a day old, so it's clearly pruning already, but is there some way I can
clear them out manually without breaking stuff, assuming that all the
transactions they describe have been completed?
Don't manually
Scrub apparently dies because it cannot acquire a file descriptor. Scrub does
not correctly closes files
(https://issues.apache.org/jira/browse/CASSANDRA-2669)
so that may be part of why that happens. However, a simple fix is probably to
raise up the file descriptor limit.
--
Sylvain
On Fri,
Correct. But that will not solve issue of data colocation(data locality) ?
From: Sasha Dolgy [mailto:sdo...@gmail.com]
Sent: Thursday, June 16, 2011 8:47 PM
To: user@cassandra.apache.org
Subject: Re: Querying superColumn
Have 1 row with employee info for country/office/division, each column an
Write two records ...
1. [department1] = { Vivek : India }
2. [India] = { Vivek : department1 }
1. [department1] = { Vivs : USA }
2. [USA] = { Vivs : department1 }
Now you can query a single row to display all employees in USA or all
employees in department1 ... employee moves to a new
As far as scrub goes that could be it. I'm already running unlimited file
handles though so ulimit not answer unfortunately
Dominic
On 17 June 2011 12:12, Sylvain Lebresne sylv...@datastax.com wrote:
Scrub apparently dies because it cannot acquire a file descriptor. Scrub
does
not correctly
On Fri, Jun 17, 2011 at 1:51 PM, Dominic Williams
dwilli...@system7.co.uk wrote:
As far as scrub goes that could be it. I'm already running unlimited file
handles though so ulimit not answer unfortunately
Are you sure ? How many file descriptors are open on the system when
you get that
scrub
I haven't done it yet, but when I researched how to make
geo-diverse/failover DCs, I figured I'd have to do something like RF=6,
strategy = {DC1=3, DC2=3}, and LOCAL_QUORUM for reads/writes. This gives
you an ack after 2 local nodes do the read/write, but the data eventually
gets distributed to
1. the right way to right that is to just say struct.name, struct.value, etc
2. why are you writing raw thrift instead of using Hector?
On Fri, Jun 17, 2011 at 5:03 AM, Vivek Mishra
vivek.mis...@impetus.co.in wrote:
From: Vivek Mishra
Sent: Friday, June 17, 2011 3:25 PM
To:
One question regarding point 2: Why should we always use Hector, Thrift is not
that bad?
Von meinem iPhone gesendet
Am 17.06.2011 um 17:12 schrieb Jonathan Ellis jbel...@gmail.com:
1. the right way to right that is to just say struct.name, struct.value, etc
2. why are you writing raw thrift
A good example for what I understand in using Hector / pycassa / etc.
is, if you wanted to implement connection pooling, you would have to
craft your own solution, versus implementing the solution that is
tested and ready to go, provided by Hector. Thrift doesn't provide
native connection pooling
If you don't get frustrated writing Thrift by hand you are a far, far
more patient man than I am.
It's tedious and error-prone to boot.
On Fri, Jun 17, 2011 at 10:30 AM, Markus Wiesenbacher | Codefreun.de
m...@codefreun.de wrote:
One question regarding point 2: Why should we always use Hector,
Thanks Jonathan. I assumed since each data center owned the full key
space that the first replica would be stored in the dc of the
coordinating node, the 2nd in another dc, and the 3rd+ back in the 1st
dc. But, are you saying that the first endpoint is selected regardless
of the location of
I see ;)
Von meinem iPhone gesendet
Am 17.06.2011 um 17:55 schrieb Jonathan Ellis jbel...@gmail.com:
If you don't get frustrated writing Thrift by hand you are a far, far
more patient man than I am.
It's tedious and error-prone to boot.
On Fri, Jun 17, 2011 at 10:30 AM, Markus
On 6/17/2011 7:26 AM, William Oberman wrote:
I haven't done it yet, but when I researched how to make
geo-diverse/failover DCs, I figured I'd have to do something like
RF=6, strategy = {DC1=3, DC2=3}, and LOCAL_QUORUM for reads/writes.
This gives you an ack after 2 local nodes do the
On Fri, Jun 17, 2011 at 12:07 PM, AJ a...@dude.podzone.net wrote:
Thanks Jonathan. I assumed since each data center owned the full key space
that the first replica would be stored in the dc of the coordinating node,
the 2nd in another dc, and the 3rd+ back in the 1st dc. But, are you saying
What I don't like about NTS is I would have to have more replicas than I
need. {DC1=2, DC2=2}, RF=4 would be the minimum. If I felt that 2 local
replicas was insufficient, I'd have to move up to RF=6 which seems like a
waste... I'm predicting data in the TB range so I'm trying to keep
+1 for this if it is possible...
On Fri, Jun 17, 2011 at 6:31 PM, Eric tamme eta...@gmail.com wrote:
What I don't like about NTS is I would have to have more replicas than I
need. {DC1=2, DC2=2}, RF=4 would be the minimum. If I felt that 2 local
replicas was insufficient, I'd have to move up
Run two Cassandra clusters...
-Original Message-
From: Eric tamme [mailto:eta...@gmail.com]
Sent: Friday, June 17, 2011 11:31 AM
To: user@cassandra.apache.org
Subject: Re: Docs: Token Selection
What I don't like about NTS is I would have to have more replicas than
I need. {DC1=2,
+1 Yes, that is what I'm talking about Eric. Maybe I could write my
own strategy, I dunno. I'll have to understand more first.
On 6/17/2011 10:37 AM, Sasha Dolgy wrote:
+1 for this if it is possible...
On Fri, Jun 17, 2011 at 6:31 PM, Eric tammeeta...@gmail.com wrote:
What I don't like
is there any way to remember the keys (rowId) inserted in cassandra database?
B.R
De : Jonathan Ellis jbel...@gmail.com
À : user@cassandra.apache.org
Cc : karim abbouh karim_...@yahoo.fr
Envoyé le : Mercredi 15 Juin 2011 18h05
Objet : Re: last record rowId
Hi All
I specified multiple hosts in seeds field when using cassandra-0.8
like this
seeds: 192.168.1.115,192.168.1.110,192.168.1.113
But I am getting error that
hile parsing a block mapping
in reader, line 106, column 13:
- seeds: 192.168.1.115,192.168. ...
have them all within a and not multiple ,
for example:
seeds: 192.168.1.115, 192.168.1.110
versus what you have...
On Fri, Jun 17, 2011 at 7:00 PM, Anurag Gujral anurag.guj...@gmail.com wrote:
Hi All
I specified multiple hosts in seeds field when using cassandra-0.8
like this
Even without lsof, you should be able to get the data from /proc/$pid
-ryan
On Fri, Jun 17, 2011 at 5:08 AM, Dominic Williams
dwilli...@system7.co.uk wrote:
Unfortunately I shutdown that node and anyway lsof wasn't installed.
But $ulimit gives
unlimited
On 17 June 2011 13:00, Sylvain
Hi,
I'd like to learn how to set up a Brisk cluster with HA/DR in Amazon. Last
time I tried this a few months ago, it was tricky because we had to either
set up a VPN or hack the Cassandra source to get internode communications to
work across regions. But with v 0.8's new BriskSnitch or
Hi Jeremiah, can you give more details?
Thanks
On 6/17/2011 10:49 AM, Jeremiah Jordan wrote:
Run two Cassandra clusters...
-Original Message-
From: Eric tamme [mailto:eta...@gmail.com]
Sent: Friday, June 17, 2011 11:31 AM
To: user@cassandra.apache.org
Subject: Re: Docs: Token
Yeah that would get the count (although I don't think you can see filenames
- or maybe I just don't know how). Unfortunately that node was shut down. I
then tried restarting with storage port 7001 to isolate as was quite toxic
for performance of cluster but it now get's OOM on restart.
If it's
Run two clusters, one which has {DC1:2, DC2:1} and one which is
{DC1:1,DC2:2}. You can't have both in the same cluster, otherwise it
isn't possible to tell where the data got written when you want to read
it. For a given key XYZ you must be able to compute which nodes it is
stored on
Yes. But, the more I think about it, the more I see issues. Here is what I
envision (Issues marked with *):
Three or more dc's, each serving as fail-overs for the others with 1 maximum
unavailable dc supported at a time.
Each dc is a production dc serving users that I choose.
Each dc also
On 6/17/2011 12:33 PM, Eric tamme wrote:
As i said previously, trying to build make cassandra treat things
differently based on some kind of persistent locality set it maintains
in memory .. or whatever .. sounds like you will be absolutely
undermining the core principles of how cassandra
On 6/17/2011 12:32 PM, Jeremiah Jordan wrote:
Run two clusters, one which has {DC1:2, DC2:1} and one which is
{DC1:1,DC2:2}. You can't have both in the same cluster, otherwise it
isn't possible to tell where the data got written when you want to read
it. For a given key XYZ you must be
Replication factor is defined per keyspace if i'm not mistaken. Can't
remember if NTS is per keyspace or per cluster ... if it's per
keyspace, that would be a way around it ... without having to maintain
multiple clusters just have multiple keyspaces ...
On Fri, Jun 17, 2011 at 9:23 PM, AJ
On 6/17/2011 1:27 PM, Sasha Dolgy wrote:
Replication factor is defined per keyspace if i'm not mistaken. Can't
remember if NTS is per keyspace or per cluster ... if it's per
keyspace, that would be a way around it ... without having to maintain
multiple clusters just have multiple
Good day everyone!
I'm getting started with a new project and I'm thinking about using
Cassandra because of its distributed quality and because of its performance.
I'm using Java on the back-end. There are many many things being said about
the Java high level clients for Cassandra on the web. To
I'm using Hector. AFAIK its the only one that supports failover today.
On Fri, Jun 17, 2011 at 6:02 PM, Daniel Colchete d...@cloud3.tc wrote:
Good day everyone!
I'm getting started with a new project and I'm thinking about using
Cassandra because of its distributed quality and because of its
My team prefers Pelops. https://github.com/s7/scale7-pelops
It's had failover since 0.7.
http://groups.google.com/group/scale7/browse_thread/thread/19d441b7cd000de0/624257fe4f94a037
With respect to avoiding writing marshaling code yourself, I agree with the
OP that that is rather lacking with
I've added some comments/questions inline...
Cheers,
--
Dan Washusen
On Saturday, 18 June 2011 at 8:02 AM, Daniel Colchete wrote:
Good day everyone!
I'm getting started with a new project and I'm thinking about using Cassandra
because of its distributed quality and because of its
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