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
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
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 sli...@liveramp.com wrote:
Hi,
I am currently performing benchmarks on Cassandra. Independently from each
other I am
Here it is, Robert, thanks!
https://issues.apache.org/jira/browse/CASSANDRA-9884
On Thu, Jul 23, 2015 at 2:13 PM, Robert Coli rc...@eventbrite.com wrote:
On Thu, Jul 23, 2015 at 12:40 PM, Carlos Scheidecker nando@gmail.com
wrote:
After updating to Cassandra 2.2.0 from 2.1.6 I am having
On Thu, Jul 23, 2015 at 12:40 PM, Carlos Scheidecker nando@gmail.com
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
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 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 j...@tubularlabs.com
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
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
jack.krupan...@gmail.commailto:jack.krupan...@gmail.com
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 is
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 rwi...@fold3.com wrote:
Carlos’ suggestion (nor yours) didn’t
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
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
What is the output you are getting if you are issuing nodetool status
command ...
On 23 July 2015 at 11:30, Chamila Wijayarathna cdwijayarat...@gmail.com
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
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 to
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
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
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
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 pierredev...@gmail.com wrote:
Cassandra is not very good at massive read/bulk read if you need to retrieve
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 settext, primary key ((year, spread), time, batchid))
21 matches
Mail list logo
