-patterns-queues-and-queue-like-datasets
Kenneth Brotman
From: Jeff Jirsa [mailto:jji...@gmail.com]
Sent: Saturday, February 23, 2019 4:47 PM
To: user@cassandra.apache.org
Subject: Re: Tombstones in memtable
Would also be good to see your schema (anonymized if needed) and the select
compaction strategy are you using? You need a way to clear out those
tombstones. There exist tombstone compaction sub properties that can help
encourage compaction to grab sstables just because they’re full of tombstones
which will probably help you.
--
Jeff Jirsa
On Feb 22, 2019, a
l without
using s TTL, you can probably drop your GCGS to 1 hour (or less).
Which compaction strategy are you using? You need a way to clear out those
tombstones. There exist tombstone compaction sub properties that can help
encourage compaction to grab sstables just because they’re full of
A real quick way to get an idea might be to run nodetool status and look at the
imbalance of the data on each node assuming all the nodes have the same specs.
From: Cameron Gandevia [mailto:cameron.gande...@globalrelay.net]
Sent: Monday, February 25, 2019 3:00 PM
To:
Hi John,
Was the cluster running ok before decommissioning the node?
Why were you decommissioning the node?
Were you upgrading from 3.11.1 to 3.11.4?
From: Ioannis Zafiropoulos [mailto:john...@gmail.com]
Sent: Wednesday, February 27, 2019 7:33 AM
To: user@cassandra.apache.org
gested in the stackoverflow.com post you cited?
Kenneth Brotman
From: Dipan Shah [mailto:dipan@hotmail.com]
Sent: Thursday, February 28, 2019 2:23 AM
To: Dipan Shah; user@cassandra.apache.org
Subject: Re: MV's stuck in build state
Forgot to add version info. This is on 3.7.
[cqlsh 5.0.1 | Cassand
Shah [mailto:dipan@hotmail.com]
Sent: Monday, March 04, 2019 12:52 AM
To: Kenneth Brotman; user@cassandra.apache.org
Subject: Re: MV's stuck in build state
Hello Kenneth,
Apologies for the late reply.
1) On production the value of x was 67 MB and y was 16 MV as value
Sorry, Nitan was only making a comment about this post but the comments I’m
making are to AxonOps.
It appears we don’t have a name for anyone at AxonOps at all then! You guys
are going to need to be more open.
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Saturday
will be able to do several of the things that
you listed.
How much added value are you providing with this product? It’s up to you to
make the case. You’ll have to spend more time on the business side of things
if you want to do any business.
Kenneth Brotman
From: AxonOps [mailto:axon
max_hints_delivery_threads: 2
Thanks for your help!
On Mon, Mar 4, 2019 at 6:44 PM Kenneth Brotman
wrote:
What is the concern? Why are you looking there? The casssandra.yml file has
some notes about it. Did you read them?
From: shalom sagges [mailto:shalomsag...@gmail.com]
Sent
What is the concern? Why are you looking there? The casssandra.yml file has
some notes about it. Did you read them?
From: shalom sagges [mailto:shalomsag...@gmail.com]
Sent: Monday, March 04, 2019 7:22 AM
To: user@cassandra.apache.org
Subject: A Question About Hints
Hi All,
Does
Can we see the histogram? Why wouldn’t you at times have that many tombstones?
Makes sense.
Kenneth Brotman
From: Rahul Reddy [mailto:rahulreddy1...@gmail.com]
Sent: Thursday, February 21, 2019 7:06 AM
To: user@cassandra.apache.org
Subject: Tombstones in memtable
We have small
--++---++---
Execute CQL3 query | 2019-02-21 21:41:04.629000 | 10.216.87.180 |
0 | 127.0.0.1
Parsing select *
Sounds like a promising step forward. I’d certainly like to know when the blog
posts are up.
Kenneth Brotman
From: Matt Stump [mailto:mrevilgn...@gmail.com]
Sent: Friday, February 22, 2019 7:56 AM
To: user
Subject: Re: Looking for feedback on automated root-cause system
For some
are you able to get that much good quality
data?
Kenneth Brotman
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com]
Sent: Tuesday, March 05, 2019 10:01 AM
To: 'user@cassandra.apache.org'
Subject: RE: Looking for feedback on automated root-cause system
I see they have a website now at https
everyone thought they knew about Cassandra thread
pool tuning is wrong, nobody really knows how to tune Kafka for large messages,
or that there are major issues with the Kubernetes charts that people are using.
On Tue, Feb 19, 2019 at 4:40 PM Kenneth Brotman
wrote:
Any information you can
of answers already! Really very promising!
Thanks,
Kenneth Brotman
From: AxonOps [mailto:axon...@digitalis.io]
Sent: Sunday, March 03, 2019 7:51 AM
To: user@cassandra.apache.org
Subject: Re: AxonOps - Cassandra operational management tool
Hi Kenneth,
Thanks for your great feedback
that has already experienced in this type of change.
Thanks!
On Mon, Mar 4, 2019 at 8:27 PM Kenneth Brotman
wrote:
It sounds like your use case might be appropriate for tuning those two settings
some.
How many nodes are in the cluster?
Are both settings definitely on the default
I found their YouTube video, Machine Learning & The future of DevOps – An Intro
to Vorstella: https://www.youtube.com/watch?v=YZ5_LAXvUUo
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Tuesday, March 05, 2019 11:50 AM
To: user@cassandra.apache.org
Subject: RE: Loo
that in the
query?
If you could have tagid not be a collection, and make it part of the primary
key, that would help a lot.
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Tuesday, March 05, 2019 4:33 PM
To: user@cassandra.apache.org
Subject: RE: data modelling
Hi Bobbie
Hi Bobbie,
You’re not giving enough information to model the data. With Cassandra it’s
based on the queries you are going to need. This link to Jeffrey Carpenter’s
book, Cassandra the Definitive Guide, Chapter 5, which is on how to do data
modeling for Cassandra, should be of help to you:
mentioned were really
good.
The entire article is very good, but I wonder if it's still valid since it was
created around 4 years ago.
Thanks!
On Mon, Mar 4, 2019 at 9:37 PM Kenneth Brotman
wrote:
Makes sense If you have time and don’t mind, could you answer the following:
Do
are looking
out for some hack way to update the column.
On Wed, Feb 27, 2019 at 4:48 PM Kenneth Brotman
wrote:
Ouch! I was sure I saw it in some material I studied but no. It looks like
you have to provide the value before Cassandra, maybe through your application
or something in the stream
is constant as of now but we are expecting lot many different values
to come in
future.
Secondly, is Presto a distributed system ?
Thanks and Regards,
Goutham.
On Wed, Feb 27, 2019 at 5:09 PM Kenneth Brotman
wrote:
If you know the value already, why do you need to store
Sounds like what’s called a “static column”.
From: Goutham reddy [mailto:goutham.chiru...@gmail.com]
Sent: Wednesday, February 27, 2019 4:06 PM
To: user@cassandra.apache.org
Subject: Insert constant value for all the rows for a given column
Hi,
We have a requirement to add constant value
Hello,
Why would you want to do that?
From: Jai Bheemsen Rao Dhanwada [mailto:jaibheem...@gmail.com]
Sent: Wednesday, February 27, 2019 3:57 PM
To: user@cassandra.apache.org
Subject: Disable Truststore CA check for internode_encryption
Hello,
Is it possible to disable truststore
Correct me if my
understanding is wrong.
Regards
Goutham Reddy
On Wed, Feb 27, 2019 at 4:08 PM Kenneth Brotman
wrote:
Sounds like what’s called a “static column”.
From: Goutham reddy [mailto:goutham.chiru...@gmail.com]
Sent: Wednesday, February 27, 2019 4:06 P
How about using a default value on the column?
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Wednesday, February 27, 2019 4:23 PM
To: user@cassandra.apache.org
Subject: RE: Insert constant value for all the rows for a given column
Good point.
From: Goutham reddy
Ouch! I was sure I saw it in some material I studied but no. It looks like
you have to provide the value before Cassandra, maybe through your application
or something in the stream before Cassandra, or add it after Cassandra or use
something like Spark to process it.
Kenneth Brotman
If you know the value already, why do you need to store it in every row of a
table? Seems like something is wrong. Why do you need to do that, if you can
share that information?
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com]
Sent: Wednesday, February 27, 2019 5:08 PM
To: 'user
I meant to say, what about using Presto?
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Wednesday, February 27, 2019 4:59 PM
To: user@cassandra.apache.org
Subject: RE: Insert constant value for all the rows for a given column
Who are Presto?
From: Goutham reddy
option and we are looking
out for some hack way to update the column.
On Wed, Feb 27, 2019 at 4:48 PM Kenneth Brotman
wrote:
Ouch! I was sure I saw it in some material I studied but no. It looks like
you have to provide the value before Cassandra, maybe through your application
Here’s a DataStax article called Sharing a static column:
https://docs.datastax.com/en/cql/3.3/cql/cql_using/refStaticCol.html
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com]
Sent: Wednesday, February 27, 2019 4:08 PM
To: 'user@cassandra.apache.org'
Subject: RE: Insert constant value
d directly hitting the
org.apache.cassandra.db:type=CompactionManager mbean's stopCompaction
operation?
From: Dipan Shah [mailto:dipan@hotmail.com]
Sent: Friday, March 01, 2019 12:56 AM
To: Kenneth Brotman; user@cassandra.apache.org
Subject: Re: MV's stuck in build state
Hel
Hi Abdul,
system.local I believe has the info you would want. Here is a link about
querying the system keyspace:
https://docs.datastax.com/en/cql/3.3/cql/cql_using/useQuerySystem.html
Kenneth Brotman
From: Abdul Patel [mailto:abd786...@gmail.com]
Sent: Monday, February 25, 2019 7
, book, article, course, etc.
Date of production
Author/Presenter
Publisher/Producer/Event
Thank you for the continuing effort you have made on this project Rahul!
Kenneth Brotman
From: Rahul Singh [mailto:rahul.xavier.si...@gmail.com]
Sent: Monday, February 25, 2019 7:05 AM
the primary key should have a compound partition
key of (project_id, policy_id, device_id).
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Thursday, February 21, 2019 3:38 PM
To: user@cassandra.apache.org
Subject: RE: Group By Does Not Follow Clustering Order
Joseph
doing “policy_id=7331 and device_id=’1234567890’” and returning one
(limit 1)?
Kenneth Brotman
From: Joseph Wonesh [mailto:joseph.won...@sticknfind.com]
Sent: Thursday, February 21, 2019 10:39 AM
To: user@cassandra.apache.org
Subject: Re: Group By Does Not Follow Clustering Order
Hi all
When you say you’re trying to get all the partition of a particular SSTable,
I’m not sure what you mean. Do you want to make a copy of it? I don’t
understand.
Kenneth Brotman
From: Pranay akula [mailto:pranay.akula2...@gmail.com]
Sent: Wednesday, February 06, 2019 7:51 PM
To: user
to prevent an incomplete repair from being performed.”
Give it a read.
Kenneth Brotman
From: CPC [mailto:acha...@gmail.com]
Sent: Wednesday, February 06, 2019 11:59 PM
To: user@cassandra.apache.org
Subject: range repairs multiple dc
Hi All,
I searched over documentation but could
Lots of things come to mind. We need more information from you to help us
understand:
How long have you had your cluster running?
Is it generally working ok?
Is it just one node that is misbehaving at a time?
How many nodes do you need to replace?
Are you doing rolling restarts instead of
This webpage has relevant information on procedures you need to use:
https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsAddDCToCluster.html
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Thursday, February 07, 2019 1:31 PM
To: user@cassandra.apache.org
failing
On Thu, Feb 7, 2019 at 10:11 PM Kenneth Brotman
wrote:
Lots of things come to mind. We need more information from you to help us
understand:
How long have you had your cluster running?
A bit more than a year old. But it has been constantly growing (3 nodes to 6
nodes to 12 nodes
Isn’t that a lot of SASI indexes for one table. Could you denormalize more to
reduce both columns per table and SASI indexes per table? Eight SASI indexes
on one table seems like a lot.
Kenneth Brotman
From: Peter Heitman [mailto:pe...@heitman.us]
Sent: Tuesday, February 05, 2019 6:59
This link
https://www.datastax.com/dev/blog/debugging-sstables-in-3-0-with-sstabledump
explains how to read an SSTable with sstabledump for 3x and sstable2json for 2.x
Kenneth Brotman
From: Ben Slater [mailto:ben.sla...@instaclustr.com]
Sent: Thursday, February 07, 2019 1:19 PM
https://stackoverflow.com/questions/39823972/cassandra-node-cant-complete-jo
ining-operation
https://stackoverflow.com/questions/27251504/cassandra-2-1-2-node-stuck-on-j
oining-the-cluster
-Original Message-
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Monday
-node-stuck-on-j
oining-the-cluster
Kenneth Brotman
-Original Message-
From: Troels Arvin [mailto:tro...@arvin.dk]
Sent: Monday, February 18, 2019 2:54 AM
To: user@cassandra.apache.org
Subject: Bootstrap stuck in JOINING state?
Hello,
Nine days ago, I bootstrapped an Cassandra node, let's
for the community. Maybe we'll end up with a
download right on the Apache Cassandra web site or packaged with future
releases of Cassandra.
Kenneth Brotman
P.S. Terraform is next!
Those aren’t the same error messages so I think progress has been made.
What version of C* are you running?
How did you clear out the space?
Kenneth Brotman
From: Léo FERLIN SUTTON [mailto:lfer...@mailjet.com.INVALID]
Sent: Thursday, February 14, 2019 7:54 AM
To: user
Can we the see “nodetool tablestats” for the biggest table as well.
From: Kenneth Brotman [mailto:kenbrot...@yahoo.com.INVALID]
Sent: Sunday, February 10, 2019 7:21 AM
To: user@cassandra.apache.org
Subject: RE: Maximum memory usage
Okay, that’s at the moment it was calculated. Still need
Rahul,
Those partitions are tiny. Could you give us the table histograms for the
biggest tables.
Thanks,
Kenneth Brotman
From: Rahul Reddy [mailto:rahulreddy1...@gmail.com]
Sent: Sunday, February 10, 2019 6:43 AM
To: user@cassandra.apache.org
Subject: Re: Maximum memory usage
in our db
On Sun, Feb 10, 2019, 9:55 AM Kenneth Brotman
wrote:
Rahul,
Those partitions are tiny. Could you give us the table histograms for the
biggest tables.
Thanks,
Kenneth Brotman
From: Rahul Reddy [mailto:rahulreddy1...@gmail.com]
Sent: Sunday, February 10, 2019 6:43 AM
/cassandra_availability/whitepaper/cassandra-availability-virtual.pdf
Are the calculations consistent with your online calculator?
Thanks again,
Kenneth Brotman
From: James Briggs [mailto:james.bri...@yahoo.com.INVALID]
Sent: Friday, February 15, 2019 7:42 PM
To: user@cassandra.apache.org
Subject
Can you give us the “nodetool tablehistograms”
Kenneth Brotman
From: Rahul Reddy [mailto:rahulreddy1...@gmail.com]
Sent: Wednesday, February 06, 2019 6:19 AM
To: user@cassandra.apache.org
Subject: Maximum memory usage
Hello,
I see maximum memory usage alerts in my system.log
Exactly. When you design your data model correctly you shouldn’t have to use
ALLOW FILTERING in the queries. That is not recommended.
Kenneth Brotman
From: Peter Heitman [mailto:pe...@heitman.us]
Sent: Wednesday, February 06, 2019 6:09 PM
To: user@cassandra.apache.org
Subject: Re: SASI
Hi Kunal,
The short answer is absolutely not; that’s not what Cassandra is for.
Cassandra is a distributed database for when you have to much data for one
machine.
Kenneth Brotman
From: Kunal [mailto:kunal.v...@gmail.com]
Sent: Wednesday, February 06, 2019 3:47 PM
To: user
=bl=58bUYyNM-J=ACfU3U22U58-QPlz6kzo0zziNF-bP30l4Q=en=X=2ahUKEwi0n-nWzajgAhXnHzQIHf6jBJIQ6AEwAXoECAgQAQ#v=onepage=jeff%20carpenter%20chapter%205=false>
.
Kenneth Brotman
From: Peter Heitman [mailto:pe...@heitman.us]
Sent: Wednesday, February 06, 2019 6:33 PM
To: user@cassandra.apache.org
S
Not sure off hand why that is happening but could you try bootstrapping that
node from scratch again or try a different new node?
Kenneth Brotman
From: Léo FERLIN SUTTON [mailto:lfer...@mailjet.com.INVALID]
Sent: Wednesday, February 06, 2019 9:15 AM
To: user@cassandra.apache.org
Subject
before we decided to move to
Cassandra
On Thu, Feb 7, 2019, 8:21 AM Kenneth Brotman
wrote:
The problem is you’re not using a query first design. I would recommend first
reading chapter 5 of Cassandra: The Definitive Guide by Jeff Carpenter and Eben
Hewitt. It’s available free online at
that in the last email too not CASSANDRA-8527. But
it shouldn’t be this since you are on 3.11.3.
I think number three above answers your questions based on your original post.
See the article for the details. It’s really good.
Kenneth Brotman
From: Kenneth Brotman [mailto:kenbrot
Undetectable tombstones in Apache Cassandra:
http://thelastpickle.com/blog/2018/07/05/undetectable-tombstones-in-apache-cassandra.html
.
I thought that was resolved in 3.11.2 by CASSANDRA-8527; and you are running
3.11.3! Is there still an outstanding issue?
Kenneth Brotman
From: Ayub
Any information you can share on the inputs it needs/uses would be helpful.
Kenneth Brotman
From: daemeon reiydelle [mailto:daeme...@gmail.com]
Sent: Tuesday, February 19, 2019 4:27 PM
To: user
Subject: Re: Looking for feedback on automated root-cause system
Welcome to the world
Hi Rajsekhar,
I think monitoring the CompactionManagerMBean is what you need.
Kenneth Brotman
From: Rajsekhar Mallick [mailto:raj.mallic...@gmail.com]
Sent: Friday, February 15, 2019 8:59 AM
To: user@cassandra.apache.org
Subject: Unable to track compaction completion
Hello team
If you had a query that went across the partitions and especially if you had
vNodes set high, that would do it.
Kenneth Brotman
From: Subroto Barua [mailto:sbarua...@yahoo.com.INVALID]
Sent: Friday, February 01, 2019 8:45 AM
To: User cassandra.apache.org
Subject: Help with sudden spike
for monitoring and how did you find out it was happening?
Is this a DSE cluster or OSS Cassandra cluster?
Kenneth Brotman
From: Subroto Barua [mailto:sbarua...@yahoo.com.INVALID]
Sent: Friday, February 01, 2019 10:48 AM
To: user@cassandra.apache.org
Subject: Re: Help with sudden spike in read
Do you have that many queries? You could just review them and your data model
to see if there was an error of some kind. How long has it been happening?
What changed since it started happening?
Kenneth Brotman
From: Subroto Barua [mailto:sbarua...@yahoo.com.INVALID]
Sent: Friday
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