Hi,
We encountered the same problem and created a JIRA for it:
https://issues.apache.org/jira/browse/CASSANDRA-8387 .
/Marcus O
On 11/27/2014 04:19 PM, DuyHai Doan wrote:
Hello Peter
For safe concurrent table creation, use CREATE TABLE xxx IF NOT
EXISTS. It will use light weight transacti
Hello all,
If one has a table like this:id text,ts timestampvalues list
PK (id,ts)
How will the DTCS work? I am asking this because the writeTime() function does
not work on collections.
Planet Cassandra has some resource pages related to migrations to Cassandra.
For HBase:
http://planetcassandra.org/hbase-to-cassandra-migration/
There are pages for migration from Oracle, MySQL, MongoDB, and Redis, as well.
-- Jack Krupansky
From: Akshay Ballarpure
Sent: Friday, November 28, 2
I would suggest that dynamic table creation is, in general, not a great idea,
regardless of the database. I would seriously consider altering your approach
to use a fixed set of tables.
On Nov 28, 2014, at 1:53 AM, Marcus Olsson
mailto:marcus.ols...@ericsson.com>> wrote:
Hi,
We encountered th
Hey all,
I have a 3 node Cassandra cluster I would like to hook into hadoop for
processing the information in the Cassandra DB. I know that Datastax
version of Cassandra includes support for Hadoop right out of the box. But
I've been googling around and I don't see any good information on how to
Hello,
This is a recurrent behavior of JVM GC in Cassandra that I never completely
understood: when a node is UP for many days (or even months), or receives a
very high load spike (3x-5x normal load), CMS GC pauses start becoming very
frequent and slow, causing periodic timeouts in Cassandra. Tryi
The underlying write time is still tracked for each value in the collection
- it's part of how conflict resolution is managed - but it's not exposed
through CQL.
On Fri Nov 28 2014 at 4:18:47 AM Batranut Bogdan wrote:
> Hello all,
>
> If one has a table like this:
> id text,
> ts timestamp
> val
@Jens,
> will "inactive" CFs be released from C*'s memory after i.e. a few days
> or when under resource pressure?
No, certain memory structures are allocated and will remain resident on
each node for as long as the table exists.
> These CFs are used as "time buckets", but are to be kept for spe
Your GC settings would be helpful, though you can see guesstimate by eyeballing
(assuming settings are the same across all 4 images)
Bursty load can be a big cause of old gen fragmentation (as small working set
objects tends to get spilled (promoted) along with memtable slabs which aren’t
flush
I should note that the young gen size is just a tuning suggestion, not directly
related to your problem at hand.
You might want to make sure you don’t have issues with key/row cache.
Also, I’m assuming that your extra load isn’t hitting tables that you wouldn’t
normally be hitting.
> On Nov 28
There are two examples of hadoop with cassandra in the examples codes,
https://github.com/apache/cassandra/tree/trunk/examples/hadoop_word_count
https://github.com/apache/cassandra/tree/trunk/examples/hadoop_cql3_word_count
Does these help?
Jason
On Sat, Nov 29, 2014 at 2:30 AM, Tim Dunphy wro
Great! Thanks for these suggestions. I'll look into these tomorrow.
Tim
Sent from my iPhone
> On Nov 28, 2014, at 10:31 PM, Jason Wee wrote:
>
> There are two examples of hadoop with cassandra in the examples codes,
> https://github.com/apache/cassandra/tree/trunk/examples/hadoop_word_count
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