1) We’ve tested 100 threads in parallel and each thread created 10
tables. I think we will change our data model, but another problem may
occur. About 80% of these CFs should be truncated every day and if we
decrease many CF by creating one key field in one CF, a huge amount of
tombstones will
Dear all,
I am trying to understand and analyze the source code of Cassandra. What I
expect (and see in other codes) is that there should be three sections in a
code. 1) Initialization and input reading, 2) Core computation and 3)
Finalizing and gathering the output.
However I can not find
is this understanding correct we had a 12 node cluster with 256 vnodes on each
node (upgraded from 1.1), we added two additional nodes that streamed so much
data (600+Gb when other nodes had 150-200GB) during the joining phase that they
filled their local disks and had to be killed ?
Can you
Not really, I've passed on the comments to the doc teams.
The column timestamp is just a 64 bit int like I said.
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 29/04/2013, at 10:06 AM, Michael Theroux
An alternative to running shuffle is to do a rolling
bootstrap/decommission. You would set num_tokens on the existing hosts (and
restart them) so that they split their ranges, then bootstrap in N new
hosts, then decommission the old ones.
On 28 April 2013 22:21, John Watson j...@disqus.com
Hello.
I would like to know whether updates are propagated from local DC to remote
DCs simultaneously (so All-to-All network connections are preferable) or
Cassandra can somehow determine nearest DCs and send updates only to them
(so these nearest DCs have to propagate updates further)?
Is there
We saw this exception with 1.1.1 and also with 1.1.11 (we upgraded for
unrelated reasons, to fix the FD leak during slice queries) -- name of
the CF replaced with * for confidentiality:
10419 ERROR [CompactionExecutor:36] 2013-04-29 07:50:49,060
AbstractCassandraDaemon.java (line 132)
Hi,
I'm having some issues. I keep getting:
ERROR [GossipStage:1] 2013-04-28 07:48:48,876 AbstractCassandraDaemon.java
(line 135) Exception in thread Thread[GossipStage:1,5,main]
java.lang.OutOfMemoryError: unable to create new native thread
--
after a day or two of
I created it almost a year ago with cassandra-cli. Now show_schema returns:
create column family myCF
with column_type = 'Standard'
and comparator = 'UTF8Type'
and default_validation_class = 'UTF8Type'
and key_validation_class = 'UTF8Type'
and read_repair_chance = 0.1
and
Hi,
I am testing out Cassandra 1.2 on two of my local servers. But I face
problems with assigning tokens to my nodes. When I use nodetool to set
token, I end up getting an java Exception.
My test setup is as follows,
Node1: local ip 1 (seed)
Node2: local ip 2 (seed)
Since I have two nodes, i
For starters: If you are using the Murmur3 partitioner, which is the default
in cassandra.yaml, then you need to calculate the tokens using:
python -c 'print [str(((2**64 / 2) * i) - 2**63) for i in range(2)]'
which gives the following values:
['-9223372036854775808', '0']
From: Rahul
*hi all:*
*
*
*i can run pig with cassandra and hadoop in EC2.*
*
*
*I ,m trying to run pig with cassandra ring and hadoop *
*The ring cassandra have the tasktrackers and datanodes , too. *
*
*
*and i running pig from another machine where i have intalled the
namenode-jobtracker.*
*ihave
That's what we tried first before the shuffle. And ran into the space issue.
That's detailed in another thread title: Adding nodes in 1.2 with vnodes
requires huge disks
On Mon, Apr 29, 2013 at 4:08 AM, Sam Overton s...@acunu.com wrote:
An alternative to running shuffle is to do a rolling
Did you update num_tokens on the existing hosts and restart them, before
you tried bootstrapping in the new node? If the new node tried to stream
all the data in the cluster then this would be consistent with you having
missed that step.
You should see Calculating new tokens in the logs of the
Hi, we have a 9-node ring on m1.xlarge AWS hosts. We started having
some trouble a while ago, and it's making me pull out all of my hair.
The host in position #3 has been replaced 4 times. Each time, the host
joins the ring, I do a nodetool repair -pr, and she seems fine for about
a day.
nodetool scrub will repair out of order rows in the source SSTables for the
compaction process. Or you can stop the node and use the offline
bin/sstablescrub tool
Not sure how they got there, there was a ticket for similar problems in 1.1.1
Cheers
-
Aaron Morton
Freelance
I used JMX to check current number of threads in a production cassandra
machine, and it was ~27,000.
That does not sound too good.
My first guess would be lots of client connections. What client are you using,
does it do connection pooling ?
See the comments in cassandra.yaml around
Same behavior on 1.1.3, 1.1.5 and 1.1.9.
Currently: 1.2.3
On Mon, Apr 29, 2013 at 11:43 AM, Robert Coli rc...@eventbrite.com wrote:
On Sun, Apr 28, 2013 at 2:28 PM, John Watson j...@disqus.com wrote:
Running these 2 commands are noop IO wise:
nodetool setcompactionthroughput 0
On Mon, Apr 29, 2013 at 3:52 PM, John Watson j...@disqus.com wrote:
Same behavior on 1.1.3, 1.1.5 and 1.1.9.
Currently: 1.2.3
(below snippets are from trunk)
./src/java/org/apache/cassandra/tools/NodeCmd.java
case SETCOMPACTIONTHROUGHPUT :
if (arguments.length
On Mon, Apr 29, 2013 at 1:17 PM, aaron morton aa...@thelastpickle.com wrote:
Bulk Loader does not use CL, it's more like a repair / bootstrap.
If you have to skip a node then use repair.
The bulk loader (sstableloader) can ignore replica nodes via -i option :
Opened a ticket:
https://issues.apache.org/jira/browse/CASSANDRA-5525
On Mon, Apr 29, 2013 at 2:24 AM, aaron morton aa...@thelastpickle.comwrote:
is this understanding correct we had a 12 node cluster with 256 vnodes on
each node (upgraded from 1.1), we added two additional nodes that
Hi All,
We are happy to announce the release of Kundera 2.5.
Kundera is a JPA 2.0 compliant, object-datastore mapping library for NoSQL
datastores. The idea behind Kundera is to make working with NoSQL databases
drop-dead simple and fun. It currently supports Cassandra, HBase, MongoDB,
I thought that C* had no null values... I use a lot of CF in which only the
columns name are filled up and I request a range of column to see which
references (like 1228#16866) exists. So I would like those column to simply
disappear from the table.
Cassandra does not store null values.
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