Hi,
I am writing an application that will periodically read big amounts of data
from Cassandra and I am experiencing odd performances.
My column family is a classic time series one, with series ID and Day as
partition key and a timestamp as clustering key, the value being a double.
The query I
Hi,
I m streaming a big sstable using bulk loader of sstableloader but it's
very slow (3 Mbytes/sec) :
Summary statistics:
Connections per host: : 1
Total files transferred: : 1
Total bytes transferred: : 10357947484
Total duration (ms): : 3280229
I’ve added an option to prevent tombstone creation when using
PreparedStatements to trunk, see CASSANDRA-7304.
The problem is having tombstones in regular columns.
When you perform a read request (range query or by PK):
- Cassandra iterates over all the cells (all, not only the cells specified
You may find Spark to be useful. You can do SQL, but also use Python,
Scala or Java.
I wrote a post last week on getting started with DataFrames Spark, which
you can register as tables query using Hive compatible SQL:
Yes, Cassandra nodes accept writes during Repair. Also Repair triggers
compactions to remove any tombstones.
On Thu, May 7, 2015 at 9:31 AM, Khaja, Raziuddin (NIH/NLM/NCBI) [C]
raziuddin.kh...@nih.gov wrote:
I was not able to find a conclusive answer to this question on the
internet so I am
Thanks for the answers.
From: arun sirimalla arunsi...@gmail.commailto:arunsi...@gmail.com
Date: Thursday, May 7, 2015 at 2:00 PM
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Cc: Razi Khaja
On Thu, May 7, 2015 at 12:07 PM, Jeff Ferland j...@tubularlabs.com wrote:
Does anybody have any thoughts in regards to other things that might exist
and fulfill this (particularly offline collective compaction), have a
desire for such tools, or have any useful information for me before I
I have an ideal for backups in my mind with Cassandra to dump each columnfamily
to a directory and use an offline process to compact them all into one sstable
(or max sstable size set). I have an ideal for restoration which involves a
streaming read an sstable set and output based on whether
It sounds as though you could be having troubles with Garbage Collection. Check
your cassandra system logs and search for GC. If you see frequent garbage
collections taking more than a second or two to complete, you're going to need
to do some configuration tweaking.
On 05/07/2015 04:44 AM,
Hi
Are there any plans to support Java 8 for Cassandra 2.0, now that Java 7 is EOL?
Currently Java 7 is also recommended for 2.1. Are there any reasons not to
recommend Java 8 for 2.1?
Thanks,
Stefan
First link was broken (sorry), here is the correct link:
http://docs.datastax.com/en/cassandra/2.0/cassandra/install/installJREJNAabout_c.html
2015-05-07 8:49 GMT-03:00 Paulo Motta pauloricard...@gmail.com:
The official recommendation is to run with Java7 (
DSE 4.6.5 supports Java 8 (
http://docs.datastax.com/en/datastax_enterprise/4.6/datastax_enterprise/RNdse46.html?scroll=RNdse46__rel465)
and DSE 4.6.5 is Cassandra 2.0.14 under the hood.
I would go with 8
On 7 May 2015 at 04:51, Paulo Motta pauloricard...@gmail.com wrote:
First link was broken
Hi Ajay,
I just Googled your question and ended up here:
http://stackoverflow.com/q/11850186/260805 The only solution seem to be
Datastax Enterprise.
Cheers,
Jens
On Wed, May 6, 2015 at 7:57 AM, Ajay ajay.ga...@gmail.com wrote:
Hi,
Does Apache Cassandra (not DSE) support Hive Integration?
You might also look at Apache Drill, which has support (I think alpha) for ANSI
SQL queries against Cassandra if that would suit your needs.
On May 6, 2015, at 12:57 AM, Ajay ajay.ga...@gmail.com wrote:
Hi,
Does Apache Cassandra (not DSE) support Hive Integration?
I found couple of
Sorry if this is a double post. My message may not have posted since I sent
the email before receiving the WELCOME message.
From: Khaja, Razi Khaja
raziuddin.kh...@nih.govmailto:raziuddin.kh...@nih.gov
Date: Thursday, May 7, 2015 at 12:31 PM
To:
I was not able to find a conclusive answer to this question on the internet so
I am asking this question here.
Is a Cassandra node able to accept insert or delete operations while the node
is being repaired?
Thanks
-Razi
Yes
On Thu, May 7, 2015 at 9:53 AM -0700, Khaja, Raziuddin (NIH/NLM/NCBI) [C]
raziuddin.kh...@nih.gov wrote:
I was not able to find a conclusive answer to this question on the internet so
I am asking this question here.
Is a Cassandra node able to accept insert or delete
You may also find interesting https://github.com/Stratio/crossdata. This
project provides batch and streaming capabilities for Cassandra and others
databases though a SQL-like language.
Disclaimer: I am an employee of Stratio
2015-05-07 17:29 GMT+02:00 l...@airstreamcomm.net:
You might also
Thanks everyone.
Basically we are looking at Hive because it supports advanced queries (CQL
is limited to the data model).
Does Stratio supports similar to Hive?
Thanks
Ajay
On Thu, May 7, 2015 at 10:33 PM, Andres de la Peña adelap...@stratio.com
wrote:
You may also find interesting
When I upload I notice one core of the cassandra node is full CPU (all
other cores are idleing),
Take a look at the interrupt distribution (cat /proc/interrupts). You'll
probably see disk and network interrupts mostly/all bound to CPU0. If that
is the case, this article has an excellent
The official recommendation is to run with Java7 (
http://docs.datastax.com/en/cassandra/2.0/cassandra/install/installJREabout_c.html),
mostly to play it safe I guess, however you can probably already run C*
with Java8, since it has been stable for a while. We've been running with
Java8 for
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