Though DSE cassandra comes with hadoop integration, this is clearly is use case
for hadoop.
Any reason why cassandra is your first choice?
> On 23 Jul 2015, at 6:12 a.m., Pierre Devops wrote:
>
> Cassandra is not very good at massive read/bulk read if you need to retrieve
> and compute a la
Hello everyone,
we are experiencing performance issues with Cassandra overloading effects
(dropped mutations and node drop-outs) with the following workload:
create table test (year bigint, spread bigint, time bigint, batchid bigint,
value set, primary key ((year, spread), time, batchid))
inser
Disclaimer: I have worked for DataStax.
Cassandra is fairly good for log analytics and has been used many places
for that (
https://www.usenix.org/conference/lisa14/conference-program/presentation/josephsen
). Of course, requirements vary from place to place, but it has been a good
fit. Spark and
We have a primary table and we need search capability by batchid column. So we
are creating a manual index for search by batch id. We are using buckets to
restrict a row size in batch id index table to 50mb. As batch size may vary
drastically ( ie one batch id may be associated to 100k row keys
We have a transaction table,3 manually created index tables and few tables for
reporting.
One option is to go for atomic batch mutations so that for each transaction
every index table and other reporting tables are updated synchronously.
Other option is to update other tables async, there m
Multiple writes to a single partition key are guaranteed to be atomic.
Therefore there has to be some protection.
First rule of thumb, don’t write at insanely high rates to the same partition
key concurrently (you can probably avoid this, but hints as currently
implemented suffer because the p
Hi Peer,
I changed cassandra-env.sh and following are the parameters I used,'
MAX_HEAP_SIZE="8G"
HEAP_NEWSIZE="1600M"
But I am still unable to start the server properly. But this time
system.log has bit different logs.
https://gist.github.com/cdwijayarathna/75f65a34d9e71829adaa
Any idea on how
My guess is that you don’t understand what an atomic batch is, give that you
used the phrase “updated synchronously”. Atomic batches do not provide
isolation, and do not guarantee immediate consistency. The only thing an atomic
batch guarantees is that all of the statements in the batch will eve
What is the output you are getting if you are issuing nodetool status
command ...
On 23 July 2015 at 11:30, Chamila Wijayarathna
wrote:
> Hi Peer,
>
> I changed cassandra-env.sh and following are the parameters I used,'
>
> MAX_HEAP_SIZE="8G"
> HEAP_NEWSIZE="1600M"
>
> But I am still unable to s
Hello all,
After updating to Cassandra 2.2.0 from 2.1.6 I am having SSL issues:
My JVM is 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, mixed mode)
Ubuntu 14.04.2 LTS is on all nodes, they are the same.
Below i
Carlos’ suggestion (nor yours) didn’t didn’t provide a way to query
recently-modified documents.
His updated suggestion provides a way to get recently-modified documents, but
not ordered.
On Jul 22, 2015, at 4:19 PM, Jack Krupansky
mailto:jack.krupan...@gmail.com>> wrote:
"No way to query rec
Maybe you could explain in more detail what you mean by recently modified
documents, since that is precisely what I thought I suggested with
descending ordering.
-- Jack Krupansky
On Thu, Jul 23, 2015 at 3:40 PM, Robert Wille wrote:
> Carlos’ suggestion (nor yours) didn’t didn’t provide a way
On Thu, Jul 23, 2015 at 12:40 PM, Carlos Scheidecker
wrote:
> After updating to Cassandra 2.2.0 from 2.1.6 I am having SSL issues:
>
If you aren't the other guy, you are the second report of this issue.
You should file a JIRA on issues.apache.org, after searching to see if
someone already has.
OK, I can try that. Haven't issue a JIRA error yet so not me.
I had also tried to have the unrestricted JCE for Java 8 in and the error
has changed.
http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
From:
java.lang.NullPointerException: null
at
com.google.common
Here it is, Robert, thanks!
https://issues.apache.org/jira/browse/CASSANDRA-9884
On Thu, Jul 23, 2015 at 2:13 PM, Robert Coli wrote:
> On Thu, Jul 23, 2015 at 12:40 PM, Carlos Scheidecker
> wrote:
>
>> After updating to Cassandra 2.2.0 from 2.1.6 I am having SSL issues:
>>
>
> If you aren't th
Hi,
I am currently performing benchmarks on Cassandra. Independently from each
other I am seeing ~100k writes/sec and ~50k reads/sec. When I read and
write at the same time, writing drops down to ~1000 writes/sec and reading
stays roughly the same.
The heap used is the same as when only reading,
I obviously worded my original email poorly. I guess that’s what happens when
you post at the end of the day just before quitting.
I want to get a list of documents, ordered from most-recently modified to
least-recently modified, with each document appearing exactly once.
Jack, your schema does
My immediate guess: your transaction logs are on the same media as your
sstables and your OS prioritizes read requests.
-Jeff
> On Jul 23, 2015, at 2:51 PM, Soerian Lieve wrote:
>
> Hi,
>
> I am currently performing benchmarks on Cassandra. Independently from each
> other I am seeing ~100k w
I set up RAID0 after experiencing highly imbalanced disk usage with a JBOD
setup so my transaction logs are indeed on the same media as the sstables.
Is there any alternative to setting up RAID0 that doesn't have this issue?
On Thu, Jul 23, 2015 at 4:03 PM, Jeff Ferland wrote:
> My immediate gue
Imbalanced disk use is ok in itself. It’s only saturated throughput that’s
harmful. RAID 0 does give more consistent throughput and balancing, but that’s
another story.
As for your situation with SSD drive, you can probably tweak this by changing
the scheduler is set to noop, or read up on
htt
Concurrent update should not be problematic. Duplicate entries should not
be created. If it appears to be, explain your apparent issue so we can see
whether it is a real issue.
But at least from all of the details you have disclosed so far, there does
not appear to be any indication that this type
21 matches
Mail list logo
