Hi,
Thanks for the reply. Since nodetool cleanup is not working even after
upgrading to 2.0.13, is it recommended to go to an older version (2.0.11 for
example, with 2.0.12 also it did not work). Is there any other way of cleaning
data from existing nodes after adding a new node.
Regards,
On Tue, Mar 31, 2015 at 7:42 AM, Peer, Oded oded.p...@rsa.com wrote:
Thanks Sylvain.
Is there any way to create a composite key with only one column in
Cassandra when creating a table, or should creating a CompositeType
instance with a single column be prohibited?
It's hard to answer
It should work on 2.0.13. If it fails with that assertion, you should just
retry. If that does not work, and you can reproduce this, please file a
ticket
/Marcus
On Tue, Mar 31, 2015 at 9:33 AM, Amlan Roy amlan@cleartrip.com wrote:
Hi,
Thanks for the reply. Since nodetool cleanup is not
Hi, I have a simple question and can't find related info in docs.
I have cluster1 with 3 nodes and cluster2 with 5 nodes. I want to transfer
whole keyspace named 'mykeyspace' data from cluster1 to cluster2 using
sstableloader. I understand that it's not the best solution, I need it for
testing
What version of Cassandra are you running? Are you by any chance running
repairs on your data?
On Mon, Mar 30, 2015 at 5:39 PM, Benyi Wang bewang.t...@gmail.com wrote:
Thanks for replying.
In cqlsh, if I change to Quorum (Consistency quorum), sometime the select
return the deleted row,
I may have overcomplicated things.
In my opinion creating a CompositeType with a single type should throw an
exception.
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Tuesday, March 31, 2015 10:18 AM
To: user@cassandra.apache.org
Subject: Re: sstable writer and creating bytebuffers
Hi,
Despite of I understand that it's not the best solution, I need it for
testing purposes, I have to ask you if you considered doing an Alter
keyspace, change RF 1 for mykeyspace on cluster2 and nodetool rebuild
to add a new DC (your cluster2) ?
In the case you go your way (sstableloader)
People keep asking me if we finally found a solution (even if this is 3+
years old) so I will just update this thread with our findings.
We finally achieved doing this thanks to our bigdata and reporting stacks
by storing blobs corresponding to HLL (HyperLogLog) structures. HLL is an
algorithm
I moved my site over to Cassandra a few months ago, and everything has been
just peachy until a few hours ago (yes, it would be in the middle of the night)
when my entire cluster suffered death by GC. By death by GC, I mean this:
[rwille@cas031 cassandra]$ grep GC system.log | head -5
INFO
Some time back I created a blog article about the SSTable storage format
with some code references.
Cassandra: SSTable Storage Format
http://distributeddatastore.blogspot.com/2013/08/cassandra-sstable-storage-format.html
- bharat
On Mon, Mar 30, 2015 at 5:24 PM, Jacob Rhoden jacob.rho...@me.com
Hi Experts,
I am getting java.lang.NoClassDefFoundError:
com/datastax/spark/connector/mapper/ColumnMapper while running a app to load
data to Cassandra table using the datastax spark connector
Is there something else I need to import in the program or dependencies?
RUNTIME ERROR: Exception
In Cassandra 2.0.12, we are seeing a hundreds of these warning in every node...
WARN [Thrift-Selector_16] 2015-03-31 00:48:49,700 Message.java (line 364) Got
an IOException in internalRead!
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.read0(Native
To clarify, that's in Cassandra 2.1+. In 2.0 and earlier, we used
http://code.google.com/a/apache-extras.org/p/cassandra-dbapi2/ for cqlsh.
On Tue, Mar 31, 2015 at 10:40 AM, Tyler Hobbs ty...@datastax.com wrote:
The python driver that we bundle with Cassandra for cqlsh is the normal
python
IMHO, the most straight forward solution is to add cluster2 as a new DC for
mykeyspace and then drop the old DC.
That's how we migrated to VPC (AWS) and we love this approach since you
don't have to mess with your existing cluster, plus sync is made
automatically and you can then drop your old DC
The python driver that we bundle with Cassandra for cqlsh is the normal
python driver (https://github.com/datastax/python-driver), although
sometimes it's patched for bugfixes or is not an official release.
On Sat, Mar 28, 2015 at 5:36 PM, Ben Bromhead b...@instaclustr.com wrote:
cqlsh runs on
We use Alain's solution as well to make major operational revisions.
We have a red team and a blue team in each AWS region, so we just add
and drop datacenters to get where we want to be.
Pretty simple.
ml
On Tue, Mar 31, 2015 at 8:16 AM, Alain RODRIGUEZ arodr...@gmail.com wrote:
People keep
Is there an 'initial cause' listed under that exception you gave? As
NoClassDefFoundError is not exactly the same as ClassNotFoundException.
It meant that ColumnMapper couldn't initialize it's static initializer,
it could be because some other class couldn't be found, or it could be
some other
Hey Saurabh,
We're actually preparing for this ourselves and spinning up our own NTP
server pool. The public NTP pools have a lot of drift and should not be
relied upon for cluster technology that is sensitive to time skew like C*.
The folks at Logentries did a great write up about this which we
Hi Robert,
On Tue, Mar 31, 2015 at 2:22 PM, Robert Wille rwi...@fold3.com wrote:
Can anybody help me understand why Cassandra wouldn’t recover?
One issue when you are running a JVM and start running out of memory is
that the JVM can start throwing `OutOfMemoryError` in any thread - not
Hi Laing, I think you answered the wrong mail =).
This one is around UV on custom range model.
But I am happy that you agree on my last message about the Datacenter
switch.
C*heers
2015-03-31 16:29 GMT+02:00 Laing, Michael michael.la...@nytimes.com:
We use Alain's solution as well to make
On 03/31/2015 10:15 AM, Caraballo, Rafael wrote:
In Cassandra 2.0.12, we are seeing a hundreds of these warning in every
node…
WARN [Thrift-Selector_16] 2015-03-31 00:48:49,700 Message.java (line
364) Got an IOException in internalRead!
java.io.IOException: Connection reset by peer
On Tue, Mar 31, 2015 at 9:12 AM, Jens Rantil jens.ran...@tink.se wrote:
One issue when you are running a JVM and start running out of memory is
that the JVM can start throwing `OutOfMemoryError` in any thread - not
necessarily in the thread which is taking all the memory. I've seen this
I have a Cassandra 2.0.13 cluster with three datacenters, three nodes per
datacenter. If I open cqlsh and do a select with any consistency level that
crosses datacenters (e.g. QUORUM or ALL), it works, but takes 2+ minutes to
return. The same statement with consistency ONE or LOCAL_QUORUM is as
Have you checked time sync across all servers? The fact that you've
changed consistency levels and you're getting different results may
indicate something inherently wrong with the cluster such as writes being
dropped or time differences between the nodes.
A brute-force approach to better
I have to ask you if you considered doing an Alter keyspace, change RF
The idea is dead simple:
get data from cluster1,
put it to cluster2
vipe cluster1
I understand drawbacks of streaming sstableloader approach, I need right
now something easy. Later we consider switch to Priam since it does
Hey Robert, you might want to start by looking into the statistics of
cassandra, either exposed via nodetool or if you have monitoring
system monitor the important metrics. I have read this article moment
ago and I hope it help you
http://aryanet.com/blog/cassandra-garbage-collector-tuning to
On Tue, Mar 31, 2015 at 1:54 PM, Andrew Vant andrew.v...@rackspace.com
wrote:
I have a Cassandra 2.0.13 cluster with three datacenters, three nodes per
datacenter. If I open cqlsh and do a select with any consistency level that
crosses datacenters (e.g. QUORUM or ALL), it works, but takes 2+
You would see that if the servers' clocks were out of sync.
Make sure the time on the servers is in sync or set the client timestamps
explicitly.
On Tue, Mar 31, 2015 at 3:23 PM, Saurabh Sethi saurabh_se...@symantec.com
wrote:
I have written a unit test that creates a column family, inserts a
It's not enough to set up ntp, you're going to need to force the time to
sync. ntp is only meant to correct for drift.
You can either use ntpdate or I think there's a flag for ntpd (that I can't
remember and am in a rush out the door) that you can use to force it to
adjust to the correct time.
That’s what I found out that the clocks were not in sync.
But I have setup NTP on all 3 nodes and would expect the clocks to be in sync.
From: Nate McCall n...@thelastpickle.commailto:n...@thelastpickle.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
I have written a unit test that creates a column family, inserts a row in that
column family and then updates the value of one of the columns.
After updating, unit test immediately tries to read the updated value for that
column, but Cassandra returns the old value.
* I am using
What is your replication factor?
Any idea how much data has to be processed under the query?
With that few nodes (3) in each DC, even with replication=1, you are
probably not getting much inter-node data transfer in a local quorum, until
of course you do cross data centers and at least one full
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