You're right, there is currently no way to do this since 1) insert can't
have a IF currently and 2) update can't update such table.
We'll fix that: https://issues.apache.org/jira/browse/CASSANDRA-5715
--
Sylvain
On Sat, Jun 29, 2013 at 9:51 PM, Blair Zajac wrote:
> On 6/24/13 8:23 PM, Blair Z
Hello,
thanks to all for your answers and comments.
What we've done:
- increased Java heap memory up to 6 Gb
- changed replication factor to 1
- set durable_writes to false
- set memtable_total_space_in_mb to 5000
- set commitlog_total_space_in_mb to 6000
If I understand correctly the last para
Hi,
using C* 1.2.5 I just found a weird AssertionError in our logfiles:
...
INFO [OptionalTasks:1] 2013-07-01 09:15:43,608 MeteredFlusher.java (line
58) flushing high-traffic column family CFS(Keyspace='Monitoring',
ColumnFamily='cfDateOrderedMessages') (estimated 5242880 bytes)
INFO [OptionalT
Hi all,
I know it's an old topic, but I want to see if anything's changed on the
number of column families that C* supports, either in 1.2.x or 2.x.
For a number of reasons [1], we'd like to support multi-tenancy via
separate column families. The "problem" is that there are around 5,000
tenants t
We use playorm to do 80,000 virtual column families(a playorm feature though
the pattern could be copied). We did find out later and we are working on this
now that we wanted to map 80,000 virtual CF's into 10 real CF's so leveled
compaction can run more in parallel though or else we get stuck
Oh and if you are using STCS, I don't think the below is an issue at all
since that can run in parallel if needed already.
Dean
On 7/1/13 10:24 AM, "Hiller, Dean" wrote:
>We use playorm to do 80,000 virtual column families(a playorm feature
>though the pattern could be copied). We did find out
On Sat, Jun 29, 2013 at 8:39 PM, Glenn Thompson wrote:
> I'm Glenn Thompson and new to Cassandra. I have been trying to figure out
> how to recover from a CorruptBlockException.
> ...
> One of my nodes must have a hardware problem. Although I've been unable to
> find anything wrong via logs, sma
Hi Rob,
It was hardware. Memory. I've been loading data since I originally
posted. No exceptions so far. I had some issues with OOMs when I first
started playing with cassandra. I increased the amount RAM to the VM and
reduced the memtable size. I'm guessing it's because I'm using I3s. More
Thanks!
On 7/1/13 1:41 AM, Sylvain Lebresne wrote:
You're right, there is currently no way to do this since 1) insert can't have a
IF currently and 2) update can't update such table.
We'll fix that: https://issues.apache.org/jira/browse/CASSANDRA-5715
--
Sylvain
On Sat, Jun 29, 2013 at 9:51
What does CAS stand for? And is that the row locking feature like hbase's
setAndReadWinner that you give the previous val and next val and your next
val is returned if you won otherwise the current result is returned and
you know some other node won?
Thanks,
Dean
On 7/1/13 12:09 PM, "Blair Zajac"
On Sun, Jun 30, 2013 at 1:48 AM, wrote:
> Question; if we're co-locating our Cassandra and our compute application
> on the same nodes, are there any in-use
> patterns in Cassandra user (or Cassandra dev) applications for having the
> compute application only pull data off the
> localhost Cassand
http://en.wikipedia.org/wiki/Compare-and-swap
I believe C* uses Paxos for CAS but not completely sure?
--
Francisco Andrades Grassi
www.bigjocker.com
@bigjocker
On Jul 1, 2013, at 1:49 PM, "Hiller, Dean" wrote:
> What does CAS stand for? And is that the row locking feature like hbase's
> setAn
According to Jonathan Ellis talk at Cassandra 13 it does use Paxos:
http://www.youtube.com/watch?v=PcUpPR4nSr4&list=PLqcm6qE9lgKJzVvwHprow9h7KMpb5hcUU
http://www.slideshare.net/jbellis/cassandra-summit-2013-keynote
Andy
On 1 Jul 2013, at 19:40, Francisco Andrades Grassi
mailto:bigjoc...@gmail.
On Mon, Jul 1, 2013 at 9:19 AM, Kirk True wrote:
> What will it take for C* to support 50,000 column families?
>
As I understand it, a (the?) big problem with huge numbers of Column
Families is that each ColumnFamily has a large number of MBeans associated
with it, each of which consume heap. So
There is another problem. You now need to run repair for a large number of
column families and keyspaces and manage that, look out for schema
mismatches etc.
On Mon, Jul 1, 2013 at 4:09 PM, Robert Coli wrote:
> On Mon, Jul 1, 2013 at 9:19 AM, Kirk True wrote:
>
>> What will it take for C* to s
The most effective way to deal with obsolete Tombstones in the short lived
cache case seems to be to drop them on the floor en masse... :D
a) have two column families that the application alternates between, modulo
time_period
b) truncate and populate the cold one
c) read from the hot one
d) clear
How does dynamic snitch work with EC2MultiRegionSnitch? Can dynamic routing
only happen in one data center? We don't wan to have the requests routed to
another center even nodes are idle in other side since the network could be
slow.
Thanks in advance,
Daning
Thanks guys, these sound like good suggestions, will try those out.
Aaron, we have around 80 CFs.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Friday, June 28, 2013 10:05 PM
To: user@cassandra.apache.org
Subject: Re: about FlushWriter "All time blocked"
We do not use secondary inde
Hi,
I've been giving some thought to the way we deploy schemas and am looking
for something better than out current approach, which is to use
cassandra-cli scripts.
What do people use for this ?
cheers
--
*Franc Carter* | Systems architect | Sirca Ltd
franc.car...@sirca.org.au | www.sirca.
Hey,
I created a table with a wide row. Query on the wide row after removing the
entries and flushing the table becomes very slow. I am aware of the impact
of tombstones but it seems that there is a deadlock which prevents the
query to be completed.
step by step:
1. creating the keyspace and the
You can generate schema through the code. That is also one option.
On Mon, Jul 1, 2013 at 4:10 PM, Franc Carter wrote:
>
> Hi,
>
> I've been giving some thought to the way we deploy schemas and am looking
> for something better than out current approach, which is to use
> cassandra-cli scripts.
Franc--
I think you will find Mutagen Cassandra very interesting; it is similar to
schema management tools like Flyway for SQL databases:
Mutagen Cassandra is a framework (based on Mutagen) that provides schema
> versioning and mutation for Apache Cassandra.
>
> Mutagen is a lightweight framework
On Tue, Jul 2, 2013 at 10:33 AM, Todd Fast wrote:
> Franc--
>
> I think you will find Mutagen Cassandra very interesting; it is similar to
> schema management tools like Flyway for SQL databases:
>
Oops - forgot to mention in my original email that we will be looking into
Mutagen Cassandra in the
Hi,
We've recently been testing some of the higher performance instance classes
on EC2, specifically the hi1.4xlarge, with Cassandra. For those that are
not familiar with them, they have two SSD disks and 10 gige.
While we have observed much improved raw performance over our current
instances, we
Querying a table with 5000 thousands tombstones take 3 minutes to complete!
But Querying the same table with the same data pattern with 10,000 entries
takes a fraction of second to complete!
Details:
1. created the following table:
CREATE KEYSPACE test WITH replication = {'class': 'SimpleStrategy
This is https://issues.apache.org/jira/browse/CASSANDRA-5677.
--
Sylvain
On Tue, Jul 2, 2013 at 6:04 AM, Mohica Jasha wrote:
> Querying a table with 5000 thousands tombstones take 3 minutes to complete!
> But Querying the same table with the same data pattern with 10,000 entries
> takes a frac
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