The problem described in this article is different than what you have on
your servers and I’ll add this article should be reaad with caution, as The
Register is known for sensationalism. The article itself has no substantial
proof or enough details. In my opinion this article is clickbait.
Anyway
yeah well I don't think Oracle is treating Java the way Google is treating
Go and I am not a big fan of Go mainly because I understand the JVM is far
more robust than anything that is out there.
"Oracle just doesn't understand open source" These are the words from James
Gosling himself
I do think
Let's not debate opinion on the Oracle stewardship here, we certainly have
different views that come from different experiences.
Let's discuss facts instead :)
-- Brice
On Wed, Dec 21, 2016 at 11:34 AM, Kant Kodali wrote:
> yeah well I don't think Oracle is treating Java the way Google is trea
The fact is Oracle is horrible :)
On Wed, Dec 21, 2016 at 2:54 AM, Brice Dutheil
wrote:
> Let's not debate opinion on the Oracle stewardship here, we certainly have
> different views that come from different experiences.
>
> Let's discuss facts instead :)
>
> -- Brice
>
> On Wed, Dec 21, 2016 a
https://www.elastic.co/guide/en/elasticsearch/guide/current/_java_virtual_machine.html
On Wed, Dec 21, 2016 at 2:58 AM, Kant Kodali wrote:
> The fact is Oracle is horrible :)
>
>
> On Wed, Dec 21, 2016 at 2:54 AM, Brice Dutheil
> wrote:
>
>> Let's not debate opinion on the Oracle stewardship he
https://www.youtube.com/watch?v=9ei-rbULWoA
On Wed, Dec 21, 2016 at 2:59 AM, Kant Kodali wrote:
> https://www.elastic.co/guide/en/elasticsearch/guide/
> current/_java_virtual_machine.html
>
> On Wed, Dec 21, 2016 at 2:58 AM, Kant Kodali wrote:
>
>> The fact is Oracle is horrible :)
>>
>>
>> On
Hi Kevin,
> nodetool cfstats has some valuable data but what I would like is a 1
> minute delta.
And you are right in what you think would be useful. In many cases
variation is a way more informative than an absolute value indeed. I have a
doubt regarding your approach though.
I want to see IO
Hi Sumit,
1. I have a Cassandra cluster with 11 nodes, 5 of which have Cassandra
> version 3.0.3 and then newer 5 nodes have 3.6.0 version.
I strongly recommend to:
- Stick with one version of Apache Cassandra per cluster.
- Always be as close as possible from the last minor release of t
On Wednesday, December 21, 2016, Kant Kodali wrote:
> https://www.youtube.com/watch?v=9ei-rbULWoA
>
> On Wed, Dec 21, 2016 at 2:59 AM, Kant Kodali > wrote:
>
>> https://www.elastic.co/guide/en/elasticsearch/guide/current/
>> _java_virtual_machine.html
>>
>> On Wed, Dec 21, 2016 at 2:58 AM, Kant
On Tue, Dec 20, 2016 at 11:55 PM, Kant Kodali wrote:
> Looking at this
> http://www.theregister.co.uk/2016/12/16/oracle_targets_java_users_non_compliance/?mt=1481919461669
> I don't know why Cassandra recommends Oracle JVM?
The long answer probably dates back to before the Oracle JVM was as
close
Just want to bump this thread if possible... having trouble ferreting out
the specifics of TWCS configuration, google's not being particularly
helpful.
If tombstone compactions are disabled by default in TWCS, does one enable
them by setting values for tombstone_compaction_interval and
tombstone_t
On 12/21/2016 08:38 AM, Eric Evans wrote:
> I don't really have any opinions on Oracle per say, but Cassandra is a
> Free Software project and I would prefer that we not depend on
> commercial software, (and that's kind of what we have here, an
> implicit dependency).
Just a bit of clarification.
Reading that article the only conclusion I can reach (unless I'm
misreading) is that all the stuff that was never free is still not free -
the change is that Oracle may actually be interested in the fact that some
are using non-free products for free.
Pretty much a non-story, it seems like.
On Tu
CIL
From: Alain RODRIGUEZ [mailto:arodr...@gmail.com]
Sent: Saturday, December 17, 2016 5:18 AM
To: user@cassandra.apache.org
Subject: Re: High CPU on nodes
Hi,
What does 'nodetool netstats' looks like on those nodes?
Its not doing any streaming.
we have 30GB heap
How is the JVM / GC doing? A
https://issues.apache.org/jira/browse/CASSANDRA-6908
Disable DynamicSnitch by adding the following to cassandra.yaml (it is a
not in the file by default):
dynamic_snitch: false
On Wed, Dec 21, 2016 at 8:40 AM, Anubhav Kale
wrote:
> CIL
>
>
>
> *From:* Alain RODRIGUEZ [mailto:arodr...@gmail.c
Hi Everyone,
I am looking into the option of deploying a Cassandra cluster on Openstack
nodes instead of physical nodes due to resource management considerations.
Does anyone has any insights regarding this?
Can this combination work properly?
Since the disks (HDDs) are part of one physical machi
Hi everyone,
I have 2 C* DCs with 12 nodes in each running 1.2.18. I plan to upgrade them to
2.2.latest and wanted to run by you experts my plan.
1. Install 2.0.latest on one node at a time, start and wait for it to join
the ring.
2. Run upgradesstables on this node.
3. Repeat Step 1,2
Thank you Alain for the detailed explanation.
To answer you question on Java version, JVM settings and Memory usage. We
are using using 1.8.0_45. precisely
>java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02
Hi all,
I’m working on a project and we have Java benchmark test for testing the
performance when using Cassandra database. Create operation on a single node
Cassandra cluster is about 15K operations per second. Problem we have is when I
set up cluster with 2 or more nodes (each of them are on
You would expect some drop when moving to single multiple nodes but on the
face of it that feels extreme to me (although I’ve never personally tested
the difference). Some questions that might help provide an answer:
- what consistency level are you using for the test?
- what is your keyspace defin
I am running Cassandra 2.1.14. Upgraded to Python 2.7 from 2.6.6 and
getting the following error with CQLSH.
---
Python Cassandra driver not installed, or not on PYTHONPATH.
You might try "pip install cassandra-driver".
Python: /opt/isv/python27/bin/python
Error: can't decompress data; zlib not
Hi,
- Consistency level is set to ONE
- Keyspace definition:
"CREATE KEYSPACE IF NOT EXISTS onem2m " +
"WITH replication = " +
"{ 'class' : 'SimpleStrategy', 'replication_factor' : 1}";
- yes, the client is on separate VM
- In our project we use Cassandr
I have some queries which need to be processed in a consistent manner. I'm
setting the consistently level = ALL option on these queries.
However, I've noticed that sometimes these queries fail because of a
timeout (2 seconds).
In my use case, for certain queries, I want them to never time out and
- I'm receiving a batch of messages to a Kafka topic.
Each message has a timestamp, however the messages can arrive / get
processed out of order. I.e event 1's timestamp could've been a few seconds
before event 2, and event 2 could still get processed before event 1.
- I know the number of messag
Depending on the expected max out of order window, why not order them in
memory? Then you don't need to reread from Cassandra, in case of a problem you
can reread data from Kafka.
-Jesse
> On Dec 21, 2016, at 7:24 PM, Ali Akhtar wrote:
>
> - I'm receiving a batch of messages to a Kafka topi
cassandra.yaml has various timeouts such as read_request_timeout,
range_request_timeout, write_request_timeout, etc. The driver does as well
(via Cluster -> Configuration -> SocketOptions -> setReadTimeoutMillis).
Not sure if you can (or would want to) set them to "forever", but it's a
starting p
Given you’re using replication factor 1 (so each piece of data is only
going to get written to one node) something definitely seems wrong. Some
questions/ideas:
- are there any errors in the Cassandra logs or are you seeing any errors
at the client?
- is your test data distributed across your parti
The batch size can be large, so in memory ordering isn't an option,
unfortunately.
On Thu, Dec 22, 2016 at 7:09 AM, Jesse Hodges
wrote:
> Depending on the expected max out of order window, why not order them in
> memory? Then you don't need to reread from Cassandra, in case of a problem
> you ca
Python is missing the zlib module.
The solution to this problem depends on whether you've compiled Python from
source, or are using a distribution package.
Googling the error "can't decompress data; zlib not available" should
provide an answer on how to solve this. If not, send us more details on
Thanks All !!
I think the intent of the JIRA https://issues.apache.org/
jira/browse/CASSANDRA-6961 was to primarily deal with stale information after
outages and give opportunity for repairing the data before a node joins the
cluster. If a node started with join_ring=false doesn't accept writes
Hi ,
Attached conversation can be of some help to you.
Regards
Amit Singh
From: Sanjeev T [mailto:san...@gmail.com]
Sent: Wednesday, December 21, 2016 9:24 AM
To: user@cassandra.apache.org
Subject: Handling Leap second delay
Hi,
Can some of you share points on, the versions and handling leap s
Hallöchen!
In RDBMS terms, I have a n:m relationship between "users" and
"groups". I need to answer the questions "who's in that group" and
"in which groups is he". In my Cassandra DB, this looks like this:
CREATE TABLE users (
id uuid PRIMARY KEY,
groups_member set
groups
The question is what matters and how big cardinality is.
1. MV updates are atomic
2. Updates on 2 tables are not. You'd require a logged batch to ensure
atomicity and so the write performance is also a little bit lower than
without batches
3. If you have a hand full of groups per user, collections
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