I am on Cassandra 2.0.5. How can I use the trace functionality?
I did not check for exceptions. I will rerun and check.
Thanks for suggestions.
/Joel
2014-03-07 17:54 GMT+01:00 Duncan Sands duncan.sa...@gmail.com:
Hi Joel,
On 07/03/14 15:22, Joel Samuelsson wrote:
I try to fetch all
I get that :)
What I'd like to know is how to fix that :)
On 2014-03-09 20:24:54 +, Takenori Sato said:
You have millions of org.apache.cassandra.db.DeletedColumn instances on
the snapshot.
This means you have lots of column tombstones, and I guess, which are
read into memory by slice
This is very helpful.
Thanks a lot :)
From: Tupshin Harper [mailto:tups...@tupshin.com]
Sent: 2014年3月9日 23:36
To: user@cassandra.apache.org
Subject: Re: How many Data centers can Cassandra support?
20, easily. Probably far more, but I lack data points beyond that.
-Tupshin
On Mar 9, 2014
Hello,
I have just learnt about virtual nodes in Cassandra.
Let's assume this scenario where we have 16 tokens, 4 physical nodes, and
each physical node is responsible of 4 tokens.
I installed DSC 2.0.5 on ubuntu 12.04 with Oracle JRE 7 but dsc 2.0.5 does
not start after installation. When I check the running status..
*$ sudo service cassandra status*
it says
** could not access pidfile for Cassandra*
no other messages or anything in logs.
This is happening with
If it was not very clear, I could not manually start cassandra
*$ sudo service cassandra start*
** could not access pidfile for Cassandra*
On Mon, Mar 10, 2014 at 5:41 PM, user 01 user...@gmail.com wrote:
I installed DSC 2.0.5 on ubuntu 12.04 with Oracle JRE 7 but dsc 2.0.5 does
not
Hi,
I have the following use case:
If I update a data on DC1, I just want apps connected-first to DC2 to be
informed when this data is available on DC2 after replication.
When using Thrift, one way could be to modify CassandraServer class, to send
notification to apps according to data coming
Hello,
You have several options:
1) going forward lower gc_grace_seconds
http://www.datastax.com/documentation/cassandra/1.2/cassandra/configuration/configStorage_r.html?pagename=docsversion=1.2file=configuration/storage_configuration#gc-grace-seconds
- this is very use case specific.
Hi user 01,
On 10/03/14 13:11, user 01 wrote:
I installed DSC 2.0.5 on ubuntu 12.04 with Oracle JRE 7 but dsc 2.0.5 does not
start after installation. When I check the running status..
*$ sudo service cassandra status*
it says
** could not access pidfile for Cassandra*
no other
I also want to point out an issue I filed that was closed as not an issue:
CASSANDRA-6654 Basically if you’re using mixed TTLs on columns in a row, the
“oldest” TTL is used to determine if tombstones of other columns can be
removed. In other words, if you have a column with a 1 day TTL and a
On 03/10/2014 07:49 AM, DE VITO Dominique wrote:
If I update a data on DC1, I just want apps “connected-first” to DC2 to
be informed when this data is available on DC2 after replication.
If I run a SELECT, I'm going to receive the latest data per the read
conditions (ONE, TWO, QUORUM),
On 03/10/2014 07:49 AM, DE VITO Dominique wrote:
If I update a data on DC1, I just want apps connected-first to DC2
to be informed when this data is available on DC2 after replication.
If I run a SELECT, I'm going to receive the latest data per the read
conditions (ONE, TWO, QUORUM),
You should be able to achieve what you're looking for with a trigger vs. a
modification to the core of Cassandra.
http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-0-prototype-triggers-support
On Mon, Mar 10, 2014 at 10:06 AM, DE VITO Dominique
dominique.dev...@thalesgroup.com wrote:
You should be able to achieve what you're looking for with a trigger vs. a
modification to the core of Cassandra.
http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-0-prototype-triggers-support
Well, good point.
It leads to the question: (a) are triggers executed on all
Thanks Duncan. very helpful response indeed! Now I can run cassandra very
properly in the foreground using* cassandra -f *but when I try to run
cassandra as a service in ubuntu that fails. Initially I get the status as
*running* but very soon it says* * could not access pidfile for Cassandra*
Just so you know you should probably apply the
[jira] [Commented] (*CASSANDRA*-6790) *Triggers* are broken in trunk
As the cassandra user? (is your install from packages or tar?)
$ sudo -iu cassandra
# you should now be the cassandra user
$ cassandra -f -p /var/run/cassandra/cassandra.pid
# not sure if -f also works with -p - might drop -f and look at
# /var/log/cassandra/system.log
--
Michael
On
The Cassandra team is pleased to announce the release of Apache Cassandra
version 2.0.6.
Cassandra is a highly scalable second-generation distributed database,
bringing together Dynamo's fully distributed design and Bigtable's
ColumnFamily-based data model. You can read more here:
Thanks a lot.
[@@ THALES GROUP INTERNAL @@]
De : Edward Capriolo [mailto:edlinuxg...@gmail.com]
Envoyé : lundi 10 mars 2014 16:47
À : user@cassandra.apache.org
Objet : Re: about trigger execution ??? // RE: sending notifications through
data replication on remote clusters
Just so you know you
I will reply to myself and raise a flag in case someone is interested.
Assuming the tokens are replicated as follows:
Request to update row X
Compute the token from the row key
Identify the server with that token
Place one replica there
Increment the token until you get to a different
Hi,
How do I check for NULL values in CQL3?
I am trying to write a CQL equivalent for below SQL:
SELECT * FROM table1 WHERE col2 IS NULL;
While inserting data into C*, CQL won't let me insert NULL, I have to pass ''
for Strings and 0 for integers.
I have '' and 0s as valid data so that's
When running as root everything works fine, however when I run your
commands a normal user, here is what happens..
user01@server1:~$
*sudo -iu cassandra*
user01@server1:~$
* cassandra -f -p /var/run/cassandra/cassandra.pid*
*...*
ERROR 16:46:09,355 Exception encountered during startup
On 03/10/2014 11:56 AM, user 01 wrote:
When running as root everything works fine, however when I run your
commands a normal user, here is what happens..
user01@server1:~$ sudo -iu cassandra
Yeah, you never actually became the cassandra user. Of course, root
works ;)
$* sudo su - cassandra*
I don't know why but this isn't actually working. It does not switch me to
*cassandra* user[btw .. should this actually switch me to cassandra user??
]. This user switching on my servers does not work for users like
*tomcat7*user,
*cassandra* user but works for users
You may need to do chown -R cassandra /var/lib/cassandra /var/log/cassandra .
Don
From: user 01 [mailto:user...@gmail.com]
Sent: Monday, March 10, 2014 10:23 AM
To: user@cassandra.apache.org
Subject: Re: Cassandra DSC 2.0.5 not starting - * could not access pidfile for
Cassandra
$ sudo su -
Depending on how it was installed, try making sure that the cassandra user has
an actual login shell defined in /etc/passwd and not something like
/sbin/nologin or /bin/false.
From: user 01 user...@gmail.commailto:user...@gmail.com
Reply-To:
@Donald:
This did not worked out.. Also as I already have shown above (I think)
folder permissions seem to be correct for both *cassandra
/var/lib/cassandra* /*var/log/cassandra *folders
On Mon, Mar 10, 2014 at 11:06 PM, Donald Smith
donald.sm...@audiencescience.com wrote:
You may need to
@Sholes, Joshua: It was installed using Datastax DSC20 package for
cassandra 2.0.5.
Checked out * /etc/passwd . *An entry for cassandra user does seem to
exist. Looks like this:
*cassandra:x:107:113:Cassandra database,,,:/var/lib/cassandra:/bin/false*
On Mon, Mar 10, 2014 at 11:21 PM, user 01
That all makes sense, then. I, personally, would not give the c* user a
valid shell, unless it was just for a little testing - then change it
back to /bin/false as intended.
Since the initial problem was that the service commaned had trouble with
the PID file, and OP has tinkered with
As I understand it, even though a quorum write fails, the data is still (more
than likely) saved and will become eventually consistent through the well known
mechanisms. I have a case where I would rather this not happen--where I would
prefer that if the quorum write fails, that data NEVER
Take a 3 node cluster with RF=3, and QUORUM reads and writes. Consistency
is achieved by ensuring that at least two nodes acknowledge a write, and at
least two nodes have to participate in a read. As a result, you know that
at least one of the two nodes that you are reading from has received the
You can use blobAsType functions to insert empty blobs/values right
into your cells, for example blobAsInt(0x) will insert an *empty* integer.
http://cassandra.apache.org/doc/cql3/CQL.html#blobFun
On 3/10/14, 9:56, Rahul Gupta wrote:
Hi,
How do I check for NULL values in CQL3?
I am trying
Also it might be:
https://issues.apache.org/jira/browse/CASSANDRA-6541
That is causing the high heap.
-Jeremiah
On Feb 18, 2014, at 5:01 PM, Jonathan Ellis jbel...@gmail.com wrote:
Sounds like you have CMSInitiatingOccupancyFraction set close to 60.
You can raise that and/or figure out how
@Rahul
*Null *has a special semantics for CQL3. Setting a column value to *null *means
deleting it...
On Mon, Mar 10, 2014 at 5:56 PM, Rahul Gupta rgu...@dekaresearch.comwrote:
Hi,
How do I check for NULL values in CQL3?
I am trying to write a CQL equivalent for below SQL:
SELECT *
Oh sorry, I misunderstood. But now I'm confused about how what you are
trying to do is not accomplished with the existing IF NOT EXISTS syntax.
http://www.datastax.com/documentation/cassandra/2.0/cassandra/dml/dml_ltwt_transaction_c.html
-Tupshin
On Mar 10, 2014 4:24 PM, Wayne Schroeder
The plan IS to do the whole write as a lightweight transaction because I do
need to rely on the behavior. I am just vetting the expected behavior--that
doing it as a conditional update, i.e. a light weight transaction, that I am
not missing something and it will behave as I outlined without
And to be clear, and to elaborate, null is the default state for a
Cassandra cell if you don't write to it, so you can always create a row
with a null column by writing the row without that column being specified.
Additionally, cql's delete statement optionally takes a columns argument,
so if you
On 03/10/2014 04:12 PM, user 01 wrote:
As I mentioned I had given ownership to cassandra user for the
cassandra.pid containing folder, var/lib/cassandra /var/log/cassandra.
All of them are owned by cassandra as I verified.
However after suggestion by someone, I tried removing the
folders
On 03/10/2014 05:15 PM, Michael Shuler wrote:
I did find a bug with the same behavior you described. I have no idea
why someone *removed* the dependency on a functional JRE from the
cassandra package - this is *not* the same Depends: line as the
upstream OSS cassandra package
Quick follow-up
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