.
Regards,
Jacques-Henri Berthemet
From: "ZAIDI, ASAD A"
Reply to: "user@cassandra.apache.org"
Date: Thursday 25 July 2019 at 15:49
To: "user@cassandra.apache.org"
Subject: Performance impact with ALLOW FILTERING clause.
Hello Folks,
I was going thru documentation
So how much data can you safely fit per node using SSDs with Cassandra 3.11?
How much free space do you need on your disks?
There should be some recommendations on node sizes on:
http://cassandra.apache.org/doc/latest/operating/hardware.html
Documentation - Apache
without values is a delete of the Cell.
Regards,
Jacques-Henri Berthemet
From: Carl Mueller
Reply-To: "user@cassandra.apache.org"
Date: Wednesday 10 April 2019 at 23:53
To: "user@cassandra.apache.org"
Subject: cass-2.2 trigger - how to get clustering columns and value?
We have a
If you use LOCAL_ONE for write and read and you have RF>1, it means both
operations could go to different replicas that does not have the data yet.
Try to use LOCAL_QUORUM instead, as usual check your clocks as well.
From: Jeff Jirsa
Reply-To: "user@cassandra.apache.org"
Date: Thursday 28
I’m not sure why it`s not allowed by the Datastax driver, but maybe you could
try to use OR instead of IN?
SELECT blah FROM foo WHERE = :val1 OR = :val2
ALLOW FILTERING
It should be the same as IN query, but I don’t if it makes a difference for
performance.
From: Peter Heitman
Reply-To:
Apache Cassandra has no service executable, so you're probably using Datastax
DDAC instead, if it's the case you should contact them for support.
From: Michael Shuler on behalf of Michael Shuler
Sent: Wednesday, January 2, 2019 17:15
To:
Are there binary builds available for testing or is it source only?
--
Jacques-Henri Berthemet
-Original Message-
From: Nate McCall
Sent: Wednesday, October 24, 2018 10:02 PM
To: Cassandra Users
Subject: Re: Cassandra 4.0
When it's ready :)
In all seriousness, the past two blog
but the data is actually
the same you can always insert. If you insert on an existing record it will
just overwrite it, if you update without an existing record it will insert
data. In Cassandra there is not much difference between insert and update
operations.
Regards,
--
Jacques-Henri Berthemet
/13/cassandra-to-batch-or-not-to-batch/
--
Jacques-Henri Berthemet
From: Rajesh Kishore [mailto:rajesh10si...@gmail.com]
Sent: Thursday, April 19, 2018 11:13 AM
To: user@cassandra.apache.org
Subject: Re: Does Cassandra supports ACID txn
Thanks for the response. Let me put my question again wrt
won’t have a way to know if it
worked or not.
There is no way to rollback a statement/batch, the only way is to send an
update to modify the partition to its previous state.
Regards,
--
Jacques-Henri Berthemet
From: DuyHai Doan [mailto:doanduy...@gmail.com]
Sent: Thursday, April 19, 2018 9:10 AM
Hi Hiroyuki,
That's an interesting question, it looks like Paxos was invented in 1989:
https://en.wikipedia.org/wiki/Paxos_(computer_science)
So "prior art" could discard such patent claim.
--
Jacques-Henri Berthemet
From: Hiroyuki Yam
Hi Nate,
Thanks for the help, I passed the info to our IT.
Regards,
--
Jacques-Henri Berthemet
From: Nate McCall [mailto:n...@thelastpickle.com]
Sent: Monday, April 16, 2018 12:27 AM
To: Cassandra Users <user@cassandra.apache.org>
Subject: Re: Mailing list server IPs
Hi Jacques,
I checked with IT and I missed an email on the period where I got the last
bounce. It’s not a very big deal but I’d like to have it fixed if possible.
Gmail servers are very picky on SMTP traffic and reject a lot of things.
--
Jacques-Henri Berthemet
From: Nicolas Guyomar [mailto:nicolas.guyo
://untroubled.org/ezmlm/ezman/ezman5.html commands.
Regards,
--
Jacques-Henri Berthemet
--- Begin Message ---
Hi! This is the ezmlm program. I'm managing the
user@cassandra.apache.org mailing list.
Messages to you from the user mailing list seem to
have been bouncing. I've attached a copy of the first
ens will be
rearranged between all nodes within the DC only, the other DCs won't be
affected.
--
Jacques-Henri Berthemet
-Original Message-
From: Jinhua Luo [mailto:luajit...@gmail.com]
Sent: Wednesday, April 11, 2018 12:35 PM
To: user@cassandra.apache.org
Subject: does c* 3.0 use one ring for
If you check the Jira issue I linked you'll see a recent comment describing a
potential explanation for my mixed LWT/non-LWT problem. So, it looks like there
can be some edge cases.
I'd say that if data was inserted a while ago (seconds) there should be no
problems.
--
Jacques-Henri Berthemet
Hi Hiroyuki,
For both operations you'll have to provide partition key so "conflict" at DB
level can always be resolved.
But if two operations, LWT and non-LWT, are racing against each others the
result is unpredictable, if non-LWT is applied after LWT the result will be
overwritten.
It
A row is TTLed once all its columns are TTLed. If you want a row to be TTLed at
once just set the same TTL on all its columns.
From: Charulata Sharma (charshar)
Sent: Friday, March 23, 2018 9:52:28 PM
To: user@cassandra.apache.org
Subject:
Then you need to make the cp yourself as I described.
--
Jacques-Henri Berthemet
-Original Message-
From: phi...@free.fr [mailto:phi...@free.fr]
Sent: Tuesday, March 13, 2018 11:03 AM
To: user@cassandra.apache.org
Subject: Re: Cassandra DevCenter
Same result.
- Mail original
/com.datastax.cassandra/cassandra-driver-core/3.4.0
"Compile dependencies" and make it yourself.
--
Jacques-Henri Berthemet
-Original Message-
From: phi...@free.fr [mailto:phi...@free.fr]
Sent: Tuesday, March 13, 2018 9:51 AM
To: user@cassandra.apache.org
Subject: Re: Cassandra DevCenter
I'm n
Hi,
Try that:
groovy -cp C:\DevCenter\plugins\*.jar Cass1.groovy
--
Jacques-Henri Berthemet
-Original Message-
From: phi...@free.fr [mailto:phi...@free.fr]
Sent: Tuesday, March 13, 2018 9:40 AM
To: user@cassandra.apache.org
Subject: Re: Cassandra DevCenter
Good morning,
when I run
If throughput decreases as you add more load then it’s probably due to disk
latency, can you test SDDs? Are you using VMWare ESXi?
--
Jacques-Henri Berthemet
From: onmstester onmstester [mailto:onmstes...@zoho.com]
Sent: Monday, March 12, 2018 2:15 PM
To: user <user@cassandra.apache.
What happens if you increase number of client threads?
Can you add another instance of cassandra-stress on another host?
--
Jacques-Henri Berthemet
From: onmstester onmstester [mailto:onmstes...@zoho.com]
Sent: Monday, March 12, 2018 12:50 PM
To: user <user@cassandra.apache.org>
Subject: R
r of cores in
# your system; (8 * number_of_cores) is a good rule of thumb.
concurrent_reads: 32
concurrent_writes: 32
concurrent_counter_writes: 32
Jumping directly to 160 would be a bit high with spinning disks, maybe start
with 64 just to see if it gets better.
--
Jacques-Henri Berthemet
From:
Any errors/warning in Cassandra logs? What’s your RF?
Using 300MB/s of network bandwidth for only 130 op/s looks very high.
--
Jacques-Henri Berthemet
From: onmstester onmstester [mailto:onmstes...@zoho.com]
Sent: Monday, March 12, 2018 11:38 AM
To: user <user@cassandra.apache.org>
Subje
What’s your disk latency? What kind of disk is it?
--
Jacques-Henri Berthemet
From: onmstester onmstester [mailto:onmstes...@zoho.com]
Sent: Monday, March 12, 2018 10:48 AM
To: user <user@cassandra.apache.org>
Subject: Re: yet another benchmark bottleneck
Running two instance of
:
https://mvnrepository.com/artifact/com.datastax.cassandra/cassandra-driver-core
Put only the jars listed on the driver version you have on you classpath and it
should work.
--
Jacques-Henri Berthemet
From: Philippe de Rochambeau [mailto:phi...@free.fr]
Sent: Saturday, March 10, 2018 6:56 PM
A very interesting and detailed article, thank you DuyHai. I think this should
be part of general Cassandra documentation.
--
Jacques-Henri Berthemet
From: DuyHai Doan [mailto:doanduy...@gmail.com]
Sent: Thursday, February 22, 2018 7:04 PM
To: user <user@cassandra.apache.org>
Subje
n tell you that there was a huge rework between Cassandra
2.2 and 3.x, PartitionIterators are a very elegant solution and is really
helpful in my case, great work guys :)
--
Jacques-Henri Berthemet
-Original Message-
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent:
The main overhead is that each table locks 1MB of Java heap, so if you have
1000 tables it will use 1GB of RAM just for managing the tables, even if they
are empty.
--
Jacques-Henri Berthemet
From: Alaa Zubaidi (PDF) [mailto:alaa.zuba...@pdf.com]
Sent: Friday, February 16, 2018 1:05 AM
the
inconsistencies happened and check corresponding Cassandra logs to see what
happened.
--
Jacques-Henri Berthemet
From: Mahdi Ben Hamida [mailto:ma...@signalfx.com]
Sent: Monday, February 12, 2018 8:45 PM
To: user@cassandra.apache.org
Subject: Re: LWT broken?
On 2/12/18 2:04 AM, Jacques-Henri Berthemet
.
Regards,
--
Jacques-Henri Berthemet
From: DuyHai Doan [mailto:doanduy...@gmail.com]
Sent: Sunday, February 11, 2018 6:11 PM
To: user <user@cassandra.apache.org>
Subject: Re: LWT broken?
Mahdi , the issue in your code is here:
else // we lost LWT, fetch the winning value
9existing_id =
starting Cassandra.
Regards,
--
Jacques-Henri Berthemet
From: tsubasa.nar...@us.fujitsu.com [mailto:tsubasa.nar...@us.fujitsu.com]
Sent: mercredi 6 décembre 2017 19:49
To: user@cassandra.apache.org
Subject: ClassNotFoundException when trigger is fired
Dear All
I use cassandra trigger to detect data
Tjake is now working for Datastax and they made DSE out of Solandra.
--
Jacques-Henri Berthemet
From: Jon Haddad [mailto:jonathan.had...@gmail.com] On Behalf Of Jon Haddad
Sent: lundi 20 novembre 2017 18:11
To: user <user@cassandra.apache.org>
Subject: Re: Solr Search With Apache Cas
How are Cassandra and Solr related? they are two separate products.
--
Jacques-Henri Berthemet
From: @Nandan@ [mailto:nandanpriyadarshi...@gmail.com]
Sent: lundi 20 novembre 2017 10:04
To: user <user@cassandra.apache.org>
Subject: Re: Solr Search With Apache Cassandra
Hi Jacques,
For t
Hi,
Apache Cassandra does not have Solr search, it’s Datastax Entreprise that
supports such feature, you should contact Datastax support for such questions.
Regards,
--
Jacques-Henri Berthemet
From: @Nandan@ [mailto:nandanpriyadarshi...@gmail.com]
Sent: lundi 20 novembre 2017 06:44
To: user
only work when you have
different DCs. One DC would stay with rogue data, and the other one would
shutdown.
--
Jacques-Henri Berthemet
From: Abdelkrim Fitouri [mailto:abdou@gmail.com]
Sent: jeudi 16 novembre 2017 22:33
To: user@cassandra.apache.org
Subject: Re: Executing a check before
no difference. It also means that you may miss results until it is fully
built.
Note that I may be wrong, I’m just reading sources as I’m working on a custom
index.
--
Jacques-Henri Berthemet
From: Vlad [mailto:qa23d-...@yahoo.com.INVALID]
Sent: mercredi 12 juillet 2017 08:56
To: User
-materialized-views/
I don’t have experience on MVs, I’m stuck on 2.2 for now.
Regards,
--
Jacques-Henri Berthemet
From: @Nandan@ [mailto:nandanpriyadarshi...@gmail.com]
Sent: vendredi 9 juin 2017 10:27
To: Jacques-Henri Berthemet <jacques-henri.berthe...@genesys.com>
Cc: user@cassandra.apache.org
S
as all of them don’t exceed 64k, but you could
create dedicate columns for all attributes that you know will always be there.
--
Jacques-Henri Berthemet
From: @Nandan@ [mailto:nandanpriyadarshi...@gmail.com]
Sent: vendredi 9 juin 2017 03:14
To: user@cassandra.apache.org
Subject: Reg:- Data Mod
for Chinese, using wildcards with CJK does not make sense. 中 can be
considered as a word, not a letter, so partial matches using wildcards don’t
make sense. Also, CJK analyzer is indexing bi-grams, so you should search for
pairs of characters.
--
Jacques-Henri Berthemet
From: Jonathan Haddad
to generate test code to validate the workload?
--
Jacques-Henri Berthemet
From: michael.m...@gmail.com [mailto:michael.m...@gmail.com] On Behalf Of
Michael Mior
Sent: mardi 9 mai 2017 17:30
To: user <user@cassandra.apache.org>
Subject: NoSE: Automated schema design for Cassandra
Hi all,
I
Will you support custom secondary indexes, triggers and UDF?
I checked index code but it’s just a couple of files with commented Java code.
I’m curious to test Scylladb but our application uses LWT and custom secondary
indexes, I understand LWT is coming (soon?).
--
Jacques-Henri Berthemet
limiting factor is your disk
write speed and latency, I don’t see how C++ changes anything in this regard
unless you can cache all your data in memory.
I’d be curious to know how ScyllaDB performs with a 100+ nodes cluster with PBs
of data compared to Cassandra.
--
Jacques-Henri Berthemet
From
Hi,
This is very interesting that there is a difference between vanilla Cassandra
and DSC, I thought it was simply the same thing provided with a setup/package.
--
Jacques-Henri Berthemet
From: Eduardo Alonso [mailto:eduardoalo...@stratio.com]
Sent: vendredi 6 mai 2016 07:36
To: user
Hi,
You can’t batch LWT if they don’t work on the same partition. So in your below
queries all the values of “id” must be the same.
--
Jacques-Henri Berthemet
From: y2k...@gmail.com [mailto:y2k...@gmail.com] On Behalf Of Jimmy Lin
Sent: mercredi 27 avril 2016 18:14
To: user
You’re right. I meant about data integrity, I understand it’s not everybody’s
priority!
--
Jacques-Henri Berthemet
From: Jonathan Haddad [mailto:j...@jonhaddad.com]
Sent: jeudi 31 mars 2016 17:48
To: user@cassandra.apache.org
Subject: Re: How many nodes do we require
Losing a write is very
Because if you lose a node you have chances to lose some data forever if it was
not yet replicated.
--
Jacques-Henri Berthemet
From: Jonathan Haddad [mailto:j...@jonhaddad.com]
Sent: vendredi 25 mars 2016 19:37
To: user@cassandra.apache.org
Subject: Re: How many nodes do we require
Why would
I found this calculator very convenient:
http://www.ecyrd.com/cassandracalculator/
Regardless of your other DCs you need RF=3 if you write at LOCAL_QUORUM, RF=2
if you write/read at ONE.
Obviously using ONE as CL makes your cluster very fragile.
--
Jacques-Henri Berthemet
-Original
tables
that holds index options but it seems I need to restart Cassandra twice to be
able to see the changes.
Regards,
--
Jacques-Henri Berthemet
From: Jack Krupansky [mailto:jack.krupan...@gmail.com]
Sent: vendredi 4 mars 2016 18:40
To: user@cassandra.apache.org
Subject: Re: Updating secondary index o
It’s not possible, it’s a PerRowSecondary index, potentially as big as the
table itself (few TBs) it will take a very long time to drop and re-create.
--
Jacques-Henri Berthemet
From: DuyHai Doan [mailto:doanduy...@gmail.com]
Sent: vendredi 4 mars 2016 14:52
To: user@cassandra.apache.org
Hi,
I'm using Cassandra 2.2.5 with a custom secondary index. It's created with the
below syntax:
https://docs.datastax.com/en/cql/3.1/cql/cql_reference/create_index_r.html
CREATE CUSTOM INDEX ON users (email) USING 'path.to.the.IndexClass' WITH
OPTIONS = {'some_setting': 'value'};
I'd like to
the schema upgraded
that much.
--
Jacques-Henri Berthemet
From: Ken Hancock [mailto:ken.hanc...@schange.com]
Sent: mardi 2 février 2016 17:14
To: user@cassandra.apache.org
Subject: Re: automated CREATE TABLE just nuked my cluster after a 2.0 -> 2.1
upgrade
Just to close the l
conflicts it will be
resolved on the basis of the row timestamp.
--
Jacques-Henri Berthemet
From: Stephen Baynes [mailto:stephen.bay...@smoothwall.net]
Sent: lundi 5 octobre 2015 11:00
To: user@cassandra.apache.org
Subject: Re: Changing schema on multiple nodes while they are isolated
> Why do
be enabled at any given time.
--
Jacques-Henri Berthemet
From: Stephen Baynes [mailto:stephen.bay...@smoothwall.net]
Sent: vendredi 2 octobre 2015 16:46
To: user@cassandra.apache.org
Subject: Changing schema on multiple nodes while they are isolated
Is it safe to make schema changes ( e.g. create keyspace
Why don’t you simply let the node join the cluster? It will pull new tables and
the data automatically.
--
Jacques-Henri Berthemet
From: Stephen Baynes [mailto:stephen.bay...@smoothwall.net]
Sent: vendredi 2 octobre 2015 18:08
To: user@cassandra.apache.org
Subject: Re: Changing schema
Hi,
Any idea when 2.2.2 will be released?
I see there are still 3 issues left to fix:
https://issues.apache.org/jira/browse/CASSANDRA/fixforversion/1219/?selectedTab=com.atlassian.jira.jira-projects-plugin:version-summary-panel
--
Jacques-Henri Berthemet
-Original Message-
From
What if you use an update statement in the second query?
--
Jacques-Henri Berthemet
-Original Message-
From: Tommy Stendahl [mailto:tommy.stend...@ericsson.com]
Sent: vendredi 28 août 2015 13:34
To: user@cassandra.apache.org
Subject: Re: TTL question
Yes, I understand that but I think
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