See http://wiki.apache.org/cassandra/FAQ#mmap
Also, the discussion on
http://comments.gmane.org/gmane.comp.db.cassandra.user/14080
Hopefully these will answer your question.
-Naren
On Tue, Jan 3, 2012 at 12:53 PM, Daning Wang wrote:
> I have Cassandra server which has JVM setting -Xms4G -Xmx4
@Stephan: in that case, you can easily tell the names of all columns you
want to retrieve, so you can make a query to retrieve those list of
composite columns.
@Jeremiah,
So where is my best bet ? Should I leave the supercolumns as it is as of
now, since I can find a good way to use them incase I
What you are probably running into is that list from the cli can bring all
the columns of a key into memory. I have counters using composite keys and
about 1k columns causes this to happen. We should have some paging support
with list.
On Tuesday, January 3, 2012, Maxim Potekhin wrote:
> I came b
I came back from Xmas vacation only to see that what always was an
innocuous procedure
in CLI now reliably results in OOM -- does anyone have ideas why?
It never happened before. Version of Cassandra is 0.8.8.
2956 java -ea
-javaagent:/home/cassandra/cassandra/bin/../lib/jamm-0.2.2.jar
-XX:+
Congrats on what seems to be a nice piece of work, need to check it out.
Nicely complements other tools.
Maxim
On 1/2/2012 12:48 PM, Markus Wiesenbacher | Codefreun.de wrote:
Hi,
I wish you all a happy and healthy new year!
As you may remember, I coded a little GUI for Apache Cassandra. Now
Hi All,
We are getting TimedOutException() when inserting data into Cassandra, it
was working fine for a few months, but suddenly got this problem. I have
increase rpc_timout_in_ms to 3, but it still timed out in 30 secs.
I turned on debug, I saw many of this error in the log
DEBUG [pool-2-t
Thanks that's very helpful. I'm assuming there's no requirement to stop
or restart Cassandra?
Thanks,
Jim
On 1/2/2012 12:07 AM, aaron morton wrote:
Renaming a CF is not directly supported.
You can:
1) Add the new CF using the CLI or CQL
2) On each node copy the SSTable files and use the ne
The bonus you're talking about here, how do I apply that?
For example, my columns are in the form of number.id such as 4.steve, 4.greg,
5.steve, 5.george. Is there a way to query a slice of numbers with a list of
ids? As in, I want all the columns with numbers between 4 and 10 which have ids
I have Cassandra server which has JVM setting -Xms4G -Xmx4G, but why top
reports 15G RES memory and 11G SHR memory usage? I understand that -Xmx4G
is only for the heap size. but it is strange that OS reports 2.5 times
memory usage. Are there a lot of memory used by JNI? Please help to explain
this.
Hi Peter,
To test, I wiped out all the data from Cassandra and inserted just one
record. The row key is "7a7a32323636373030303438303031". I used
getendpoints to see where my data is and double checked the same using
sstable2json command.
Since the RF is 2, the data is currently on Node 1 and Node
I was able to scrub the node the repair that failed was running on. Are you
saying the error could be displayed on that node but the bad data coming
from another node ?
Log inspection also showed many of these, they seem to happen around when a
stream transfer finishes.
ERROR [Thread-550876] 2012-
The main issue with replacing super columns with composite columns right
now is that if you don't know all your sub-column names you can't select
multiple "super columns" worth of data in the same query without getting
extra stuff. You have to use a slice to get all subcolumns of a given
super
I have a super columns family which I always use to retrieve a list of
supercolumns(with all subcolumns) by name. I am looking forward to replace
all SuperColumns in my schema with the composite columns.
How could I design schema so that I could do the equivalent of retrieving a
list of supercolum
Running a time based rolling window of data can be done using the TTL. Backing
up the nodes for disaster recover can be done using snapshots. Restoring any
point in time will be tricky because to may restore columns where the TTL has
expired.
> Will I get a single copy of the data in the remot
The DynamicSnitch can result in less read operations been sent to a node, but
as long as a node is marked as UP mutations are sent to all replicas. Nodes
will shed load when they pull messages off the queue that have expired past
rpc_timeout, but they will not feed back flow control to the other
Awesome! Thank you Sasha, I will give that a try! It may be a day or two before
I can get to this again, but I will definitely let you know how it goes.
Thanks,
Tim
Sent from my iPhone
On Jan 3, 2012, at 8:23 AM, Sasha Dolgy wrote:
> Have you looked at PHPCassa [ https://github.com/thobbs/ph
Have you looked at PHPCassa [ https://github.com/thobbs/phpcassa ]
instead of using Thrift direct? I've had no issues with getting it to
work with versions 0.7.x, 0.8.x and now 1.x ... it adds better error
handling and overall, is fairly easy to get going. Some information
to get you running: ht
unfortunately not .. :( thanks for checking. still looking for advice
on this! tx
On Tue, Jan 3, 2012 at 3:47 AM, aaron morton wrote:
> Tim,
> Did you get this sorted out ?
>
> Cheers
>
> -
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 2
Hi,
I need to build a system that stores data for years, so yes, I am backing
up data in another mass storage system from where it could be later
accessed. The data that I successfully back up has to be deleted from my
cluster to make space for new data coming in.
I was aware about the snapshotti
Hello.
We are using cassandra for some time in our project. Currently we are on
1.1 trunk (it was accidental migration, but since it's hard to migrate back
and it's performing nice enough we are currently on 1.1).
During New Year holidays one of the servers've produces a number of OOM
messages in
Thanks Sylvain!
That's exactly what I needed to know.
On Mon, Jan 2, 2012 at 12:49 PM, Sylvain Lebresne wrote:
> On Mon, Jan 2, 2012 at 11:51 AM, Thibaut Britz
> wrote:
> > Hi,
> >
> > due to a misconfiguration on our site, some parts of our data got saved
> with
> > a wrong expiration date,
Tim,
Did you get this sorted out ?
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 28/12/2011, at 3:11 PM, Tim Dunphy wrote:
> hello,
>
> I am new to the world of non-relational databases. Cassandra is
> refreshingly easy to se
That sounds a little complicated.
Do you want to get the data out for an off node backup or is it for processing
in another system ?
You may get by using:
* TTL to expire data via compaction
* snapshots for backups
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http:
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