I don't want to optimize for reads or writes, I want to optimize for having the
smallest gap possible between the time I write and the time I read.
[]s
From: user@cassandra.apache.org
Subject: Re: to normalize or not to normalize - read penalty vs write penalty
Roughly how often do you expect
Roughly how often do you expect to update alerts? How often do you expect
to read the alerts? I suspect you'll be doing 100x more reads (or more),
in which case optimizing for reads is the definitely right choice.
On Wed, Feb 4, 2015 at 9:50 AM, Marcelo Valle (BLOOMBERG/ LONDON)
If you're getting started with Cassandra, definitely prefer CQL over Thrift
(Astyanax's default interface). New features will be coming to CQL in
later versions, and they will not be backported to Thrift, it's a frozen
interface, and will eventually be deprecated.
But with Astyanax you want to
Hi all,
I have a problem with my client on Cassandra 1.2.18 which I did not have on
Cassandra 1.0.11
I create a big row with a lot of super-columns.
When writing that row using batch_mutate, I receive the following error in
my client:
A connection attempt failed because the connected party did
I would not suggest only date as the partition key. This creates all the
records related to a single day go into a single partition and will create
load on one partition when other partitions are free. Try to add some
other field also to the primary key so that the load is distributed.
Check
After a little testing I see that the client has a time-out because the
server takes longer.
This large batch_mutate took 5 seconds in Cassandra 1.0.11
The same batch_mutate takes three minutes in Cassandra 1.2.18
Is that normal!?
Thanks,
Rene
2015-02-04 18:29 GMT+01:00 Rene Kochen
Okay. Let's assume with denormalization you have to do 1000 writes (and
one read per user) and with normalization you have to do 1 write (and maybe
1000 reads for each user).
If you execute the writes in the most optimal way (batched by partition, if
applicable, and separate, concurrent requests
Perfect Tyler.
My feeling was leading me to this, but I wasn't being able to put it in words
as you did.
Thanks a lot for the message.
From: user@cassandra.apache.org
Subject: Re: to normalize or not to normalize - read penalty vs write penalty
Okay. Let's assume with denormalization you
On Wed, Feb 4, 2015 at 10:45 AM, Rene Kochen rene.koc...@schange.com
wrote:
This large batch_mutate took 5 seconds in Cassandra 1.0.11
The same batch_mutate takes three minutes in Cassandra 1.2.18
Doesn't seem normal to me. But large batch_mutates are generally considered
an anti-pattern...
Hi,
I am getting below error:
Not able to understand why ??
[csduser@master bin]$ ./cassandra -f
CompilerOracle: inline org/apache/cassandra/db/AbstractNativeCell.compareTo
(Lorg/apache/cassandra/db/composites/Composite;)I
CompilerOracle: inline
I would start looking in /home/csduser/cassandra/conf/cassandra.yaml.
Perhaps you could validate the YAML format of that file with an independent
tool such as http://yaml-online-parser.appspot.com/
On Wed, Feb 4, 2015 at 5:23 PM, Krish Donald gotomyp...@gmail.com wrote:
Hi,
I am getting
Hello everyone,
I am thinking about the architecture of my application using Cassandra and I am
asking myself if I should or shouldn't normalize an entity.
I have users and alerts in my application and for each user, several alerts.
The first model which came into my mind was creating an
What about 15 gb?
not ok :) don't let a single partition get to 1gb, 100's of mb should be
when flares are going up. The main reasoning is compactions would be
horrifically slow and there will be a lot of gc pain. Bringing the time
bucket to be by day will probably be sufficient. It would take
From: clohfin...@gmail.com
Subject: Re: data distribution along column family partitions
not ok :) don't let a single partition get to 1gb, 100's of mb should be when
flares are going up. The main reasoning is compactions would be horrifically
slow and there will be a lot of gc pain.
I have a 3 node cluster running Cassandra version 2.1.2. Through my unit test,
I am creating a column family with 3 columns, inserting a row, asserting that
the values got inserted and then truncating the column family.
After that I am adding a fourth column to the column family and inserting a
INFO 22:17:19 Loading settings from file:/home/csduser/cassandra/
conf/cassandra.yaml
ERROR 22:17:20 Fatal configuration error
org.apache.cassandra.exceptions.ConfigurationException: Invalid yaml
You have an malformed cassandra.yaml config file that is resulting in
Cassandra not being able
Hello,
I am designing a model to store alerts users receive over time. I will want
to store probably the last two years of alerts for each user.
The first thought I had was having a column family partitioned by user +
timebucket, where time bucket could be something like year + month. For
Since I don't know what's in your keystore, or how it was generated, I
don't know how much help I can be.
You probably need -alias something on the command line, and make sure a
cert by the name something exists in your keystore. You can use
keytool -list ... to examine the contents.
Adam
Thanks a lot.
I think I need the ‘ –alias’ option.
From: Adam Holmberg [mailto:adam.holmb...@datastax.com]
Sent: 2015年2月4日 23:17
To: user@cassandra.apache.org
Subject: Re: FW: How to use cqlsh to access Cassandra DB if the
client_encryption_options is enabled
Since I don't know what's in
The data model lgtm. You may need to balance the size of the time buckets
with the amount of alarms to prevent partitions from getting too large. 1
month may be a little large, I would aim to keep the partitions below 25mb (can
check with nodetool cfstats) or so in size to keep everything
Hi,
I am new to Cassandra and have setup 4 nodes Cassandra cluster using VMs.
Looking for any case study which I can do to understand the Cassandra
Administration and put in my resume as well.
Any help is appreciated.
Thanks
Krish
I have used the yaml validator but tried to fixed based on error messages ,
I had to comment data_directories , commitlog_directory and saved_caches
directory and after that it worked.
Thanks a lot for the help ...
On Wed, Feb 4, 2015 at 2:32 PM, Mark Reddy mark.l.re...@gmail.com wrote:
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