Hi Aaron
Thanks for the comments. Yes for the durability will keep them in a safe
place. But such crash situation, how can I restore the data (because those
are not in a SSTable and only in commit log).
Do I need to replay only that commit log when server starts after crash?
Will it override
Hello List,
I need suggestion/ recommendation on time series data.
I have requirement where users belongs to different timezone and they can
subscribe to global group.
When users at specific timezone send update to group it is available to
every user in different timezone.
I am using
Hi,
I have a columnfamily like that:
CREATE COLUMN FAMILY Clients
WITH key_validation_class = 'CompositeType(LexicalUUIDType,UTF8Type)'
AND comparator = LexicalUUIDType
AND column_metadata = [
{column_name: name, validation_class: UTF8Type}
];
My metadata definition
Hi Aaron,
No, I just avoid truncating for the moment L (I'm adding CQL prepared
statement to Cassandra-Sharp).
It's a bit strange anyway, JVM options are:
set JAVA_OPTS=-ea^
-javaagent:%CASSANDRA_HOME%\lib\jamm-0.2.5.jar^
-Xms1G^
-Xmx1G^
-XX:+HeapDumpOnOutOfMemoryError^
Hi Aaron,
Thank you for your answer, I was beginning to think that my question would
never be answered ;-)
Actually, this is what I was going for, except one thing, instead of
partitioning row per month, I though about partitioning per day, like that
everyday I launch the cleaning tool, and
On Mon, Apr 30, 2012 at 4:25 PM, Morgan Segalis msega...@gmail.com wrote:
Hi Aaron,
Thank you for your answer, I was beginning to think that my question would
never be answered ;-)
Actually, this is what I was going for, except one thing, instead of
partitioning row per month, I though
Hi Samal,
Thanks for the TTL feature, I wasn't aware of it's existence.
Day's partitioning will be less wider than month partitionning (about 30 times
less give or take ;-) )
Per day it should have something like 100 000 messages stored, most of it would
be retrieved so deleted before the TTL
On Mon, Apr 30, 2012 at 5:52 PM, Morgan Segalis msega...@gmail.com wrote:
Hi Samal,
Thanks for the TTL feature, I wasn't aware of it's existence.
Day's partitioning will be less wider than month partitionning (about 30
times less give or take ;-) )
Per day it should have something like 100
Don't use dates or datestamps as the buckets for your row keys, use a unix
timestamp modulo whatever size you want your bucket to be instead.
Timestamps don't involve time zones or any of that nonsense.
So, instead of having keys like user1uuid_30042012, the second half would
be replaced the
Hi,
We have a cassandra cluster in ec2.
If i stop a node and start it - as a result the node ip changes. The
node is recognised as NEW node and is declared as replacing the previous
node with same token.(But this is the same node of course)
In this specific case the node ip before
Isn't kafka too young for production using purpose ?
Clearly that would fit much better my needs but I can't afford early stage
project not ready for production. Is it ?
Le 30 avr. 2012 à 14:28, samal samalgo...@gmail.com a écrit :
On Mon, Apr 30, 2012 at 5:52 PM, Morgan Segalis
thanks tyler for reply.
are you saying user1uuid_*{ts%86400}* would lead to unique day bucket
which will be timezone {NZ to US} independent? I will try.
On Mon, Apr 30, 2012 at 8:25 PM, Tyler Hobbs ty...@datastax.com wrote:
Don't use dates or datestamps as the buckets for your row keys, use a
Correct, that's exactly what I'm saying.
On Mon, Apr 30, 2012 at 10:37 AM, samal samalgo...@gmail.com wrote:
thanks tyler for reply.
are you saying user1uuid_*{ts%86400}* would lead to unique day bucket
which will be timezone {NZ to US} independent? I will try.
On Mon, Apr 30, 2012 at
I did it with node.js but it is changing after some interval.
code
setInterval(function(){
var d =new Date().getTime();
console.log(== );
console.log(unix = ,d);
i=parseInt(d)
console.log(Divid i/86400= ,i/86400);
console.log(Modulo i%86400= ,i%86400);
getTime() returns the number of milliseconds since the epoch, not the
number of seconds: http://www.w3schools.com/jsref/jsref_gettime.asp
If you divide that number by 1000, it should work.
On Mon, Apr 30, 2012 at 11:28 AM, samal samalgo...@gmail.com wrote:
I did it with node.js but it is
thanks I didn't noticed.
run script for 5 minutes = divide seems to produce result ,modulo is
still changing. If divide is ok will do the trick.
I will run this script on Singapore, East coast server, and New delhi
server whole night today.
==
unix =
Err, sorry, I should have said ts - (ts % 86400). Integer division does
something similar.
On Mon, Apr 30, 2012 at 12:39 PM, samal samalgo...@gmail.com wrote:
thanks I didn't noticed.
run script for 5 minutes = divide seems to produce result ,modulo is
still changing. If divide is ok will
When you set comparator = LexicalUUIDType, you're saying that column names
are UUIDs. In your column metadata, you need to use a UUID for column_name
if that's what you want.
I suspect that you either don't want LexicalUUIDType for your column names
or you're looking for
hhmm. I will try both. thanks
On Mon, Apr 30, 2012 at 11:29 PM, Tyler Hobbs ty...@datastax.com wrote:
Err, sorry, I should have said ts - (ts % 86400). Integer division does
something similar.
On Mon, Apr 30, 2012 at 12:39 PM, samal samalgo...@gmail.com wrote:
thanks I didn't noticed.
Hi Aaron,
it's still an issue. However it's difficult to reproduce because I'd
need to insert data to Cassandra for day or more which is not
possible.
I think the problem is somehow connected to an IntegerType secondary
index. I had a different problem with CF with two secondary indexes,
the
When the server starts it reads the SSTables then applies the Commit Logs.
There is nothing you need to do other than leave the commit logs where they
are.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 30/04/2012, at 6:02 PM, Roshan
Try upgrading to the newest JVM first. Can you also say what version you were
using ?
If you still get the problem create a ticket on
https://issues.apache.org/jira/browse/CASSANDRA with the steps to reproduce.
Please include the OS version, RAM size, JVM information,
commit_log_segment_size
Hi all,
Is there a support in Cassandra 1.1 for variable range filter parameter
(sorry I can't find a right name for that):
select * from TestCF where key in (?)
using execute_prepared_cql_query ?
In the query above, it seems I can only bind one value to '?'.
I mean, if several
JVM is the latest available after all.
Filled CASSANDRA-4201.
Thanks,
- Pierre
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: lundi 30 avril 2012 22:36
To: user@cassandra.apache.org
Subject: Re: Crash by truncate with cassandra 1.1
Try upgrading to the newest JVM first.
Hi Pierre-
Yes, each ? can only represent one value at a time (although it can take on
a different value for each actual execution of the prepared query). This is
certainly normal for SQL binding libraries. Not sure why you feel that
defeats statement preparation.
p
On Mon, Apr 30, 2012 at 3:45
If I prepare “select * from Town where key in (?)”
I will be able to bind ? to 'Paris' for example [è select * from Town where key
in ('Paris')].
If I want to query for 'Paris' and 'London', the query should be restated to
“select * from Town where key in (?, ?)” [è select * from Town where
Many Thanks Aaron.
According to the datastax restore documentation, they ask to remove the
commitlogs before restoring (Clear all files the
/var/lib/cassandra/commitlog (by default)).
In that case better not to follow this step in a server rash situation.
Thanks
/Roshan
--
View this
David Strauss david at davidstrauss.net writes:
It's not, currently, but I'm happy to answer questions about its architecture.
David,
Has your cassandraFS / WebDav software made it into the light of open source?
Does yo integrate into other systems for user info, and simply store data
Hello group,
I'm a new Cassandra and Java user so I'm still trying to get my head around a
few things. If you've disabled swap on a machine what is the reason to use
JNA? A second question is doesn't JNA break the Java inherent security
mechanisms by allowing access to direct system calls
Gossip information about a node can stay in the cluster for up to 3 days. How
long has this been going on for ?
I'm unsure if this is expected behaviour. But it sounds like Gossip is kicking
out the phantom node correctly.
Can you use nodetool gossipinfo on the nodes to capture some artefacts
Isn't kafka too young for production using purpose ?
The best way to advance the project is to use it and contribute your experience
and time.
btw, checking out kafka is a great idea. There are people around having Fun
Times with Kafka in production
Cheers
-
Aaron Morton
Can you provide a link to that page ?
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 1/05/2012, at 10:12 AM, Roshan wrote:
Many Thanks Aaron.
According to the datastax restore documentation, they ask to remove the
commitlogs before
If you've disabled swap on a machine what is the reason to use JNA?
JNA will still be used to efficiently make hard links for snapshots. It's not
necessary to lock the JVM memory when swap is disabled.
A second question is doesn't JNA break the Java inherent security mechanisms
by allowing
On Mon, Apr 30, 2012 at 2:11 PM, Patrik Modesto
patrik.mode...@gmail.com wrote:
I think the problem is somehow connected to an IntegerType secondary
index.
Could be, but my money is on the supercolumns in the HH data model.
Can you create a jira ticket?
--
Jonathan Ellis
Project Chair,
On Mon, Apr 30, 2012 at 7:49 PM, Cord MacLeod cordmacl...@gmail.com wrote:
Hello group,
I'm a new Cassandra and Java user so I'm still trying to get my head around a
few things. If you've disabled swap on a machine what is the reason to use
JNA?
Faster snapshots, giving hints to the page
Incremental snapshots contain only new data, so they are *much* smaller.
On Mon, Apr 30, 2012 at 12:39 AM, Tamar Fraenkel ta...@tok-media.comwrote:
Hi!
I wonder what are the advantages of doing incremental snapshot over non
incremental?
Are the snapshots smaller is size? Are there any other
The documentation in the cassandra.yaml file covers this pretty well.
In summary, a snapshot will create a hard link for each file in the data
directory (if JNA is installed and on the classpath).
Turning on incremental backup will create a hard link to every new SSTable
that is flushed out to
That should work. I don't see anything obviously wrong with your
query, other than the trivial (ascii values need to be quoted).
Assuming that's not the problem, please file a ticket if you have a
failing test case.
On Fri, Apr 20, 2012 at 11:59 PM, Nagaraj J nagaraj.pe...@gmail.com wrote:
Hi
CQL doesn't currently let you filter on columns which aren't part of a
primary key or indexed, so the and x=2 and z=2 part of your query is not
valid.
p
On Mon, Apr 30, 2012 at 8:54 PM, Jonathan Ellis jbel...@gmail.com wrote:
That should work. I don't see anything obviously wrong with your
No, there isn't right now. But note that there shouldn't be a whole lot of
performance difference between
select * from Town where key in ('Paris', 'London');
and
select * from Town where key = 'Paris';
select * from Town where key = 'London';
..other than round-trip times. Or, I
Thanks for posting the script.
I see that the snapshot is always a full one, and if I understand
correctly, it replaces the old snapshot on S3. Am I right?
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54
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