What's your vm.max_map_count setting?
Best Regards,
Liang
发件人: Leon Oosterwijk leon.oosterw...@macquarie.com
发送时间: 2014年12月19日 11:55
收件人: user@cassandra.apache.org
主题: Cassandra 2.1.0 Crashes the JVM with OOM with heaps of memory free
All,
We have a
On 18/12/14 21:45, Robert Coli wrote:
On Tue, Dec 16, 2014 at 12:38 AM, Jonas Borgström jo...@borgstrom.se
mailto:jo...@borgstrom.se wrote:
That said, I've done some testing and it appears to be possible to
perform an in place conversion as long as all nodes contain all data (3
Hi,
I am using cassandra 2.1.2 with 5 node cluster single DC.
I've read that histograms are reset after node restart or rerun of command.
But in my case it's not resetting by running every time.
Could someone point what could be the issue or how could I reset it without
restarting node.
Thanks! in
Hi guys,
We expanded our cluster to a multiple DC configuration.
Now I am wondering if there is any way to know:
1 - The replication lag between these 2 DC (Opscenter, nodetool, other ?)
2 - Make sure that sync is ok at any time
I guess big companies running Cassandra are interested in these
Today I've also seen this benchmark in Chinese websites. SequoiaDB seems
come from a Chinese startup company, and in db-engines ranking
http://db-engines.com/en/ranking it's score is 0.00. So IMO I have to say
I think this benchmark is a soft sell. They compare three databases, two
written by c++
Alain,
AFAIK, the DC replication is not linearizable. That is, writes are are not
replicated according to a binlog or similar like MySQL. They are replicated
concurrently.
To answer you questions:
1 - Replication lag in Cassandra terms is probably “Hinted handoff”. You’d want
to check
Hi again,
A follow-up question (to my yet unanswered question):
How come the first localDeletion is Integer.MAX_VALUE above? Should it be?
Cheers,
Jens
———
Jens Rantil
Backend engineer
Tink AB
Email: jens.ran...@tink.se
Phone: +46 708 84 18 32
Web: www.tink.se
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htmlbodyHello,
I am in the middle of evaluating whether we should switch from Astyanax to
datastax driver and I did simple benchmark that load 10 000 times the same row
by key and I was surprised with the slowness of datastax driver. I uploaded it
to github.
Hi Jens, thanks for your insight.
Replication lag in Cassandra terms is probably “Hinted handoff” -- Well I
think hinted handoff are only used when a node is down, and are not even
mandatory enabled. I guess that cross DC async replication is something
else, taht has nothing to see with hinted
Better question for the java driver mailing list, but I see a number of
problems in your Datastax java driver code, and without knowing the way
Astyanax handles caching of prepared statements I can tell you
1. You're re repreparing a statement on _every_ iteration, and these are
not cached
It does appear to be a ulimit issue to some degree as some settings are
lower than recommended by a few factors (namely nproc).
http://www.datastax.com/documentation/cassandra/2.0/cassandra/install/installRecommendSettings.html
* - memlock unlimited
* - nofile 10
* - nproc 32768
* - as
Hello all,I just read that the default size of the Key cache is 100 MB. Is it
stored in memory or disk?
More accurately,the write path of Cassandra in a multi dc sense is kinda
like the following
1. write goes to a node which acts as coordinator
2. writes go out to all replicas in that DC, and then one write per remote
DC goes out to another node which takes responsibility for writing to all
Thanks, this looks uglier , I double checked my production cluster ( I have a
staging and development cluster as well ) and
production is on 1.2.8. A copy of the data resulted in a mssage :
Exception encountered during startup: Incompatible SSTable found. Current
version ka is unable to read
We're seeing similar behavior except our FP ratio is closer to 1.0 (100%).
We're using Cassandra 2.1.2.
Schema
---
CREATE TABLE contacts.contact (
id bigint,
property_id int,
created_at bigint,
updated_at
All that you said match the idea I had of how it works except this part:
The request blocks however until all CL is satisfied -- Does this mean
that the client will see an error if the local DC write the data correctly
(i.e. CL reached) but the remote DC fails ? This is not the idea I had of
It may be more valuable to set up your test cluster as the same version,
and make sure your tokens are the same. then copy over your sstables.
you'll have an exact replica of prod you can test your upgrade process.
On Fri Dec 19 2014 at 11:04:58 AM Ryan Svihla rsvi...@datastax.com wrote:
In
Hi list,
we added a new node to existing 8-nodes cluster with C* 1.2.9 without
vnodes and because we are almost totally out of space, we are shuffling
the token fone node after another (not in parallel). During one of this
move operations, the receiving node died and thus the streaming failed:
replies inline
On Fri, Dec 19, 2014 at 10:30 AM, Alain RODRIGUEZ arodr...@gmail.com
wrote:
All that you said match the idea I had of how it works except this part:
The request blocks however until all CL is satisfied -- Does this mean
that the client will see an error if the local DC write
if you have JNA installed it's stored off-heap in ram, without JNA it's
stored on heap in ram. The following should help explain in more depth
http://www.datastax.com/dev/blog/maximizing-cache-benefit-with-cassandra
On Fri, Dec 19, 2014 at 8:35 AM, Batranut Bogdan batra...@yahoo.com wrote:
Your gc grace should be longer than your repair schedule. You're likely
going to have deleted data resurface.
On Fri Dec 19 2014 at 8:31:13 AM Alain RODRIGUEZ arodr...@gmail.com wrote:
All that you said match the idea I had of how it works except this part:
The request blocks however until
I took a look at the code where the bloom filter true/false positive
counters are updated and notice that the true-positive count isn't being
updated on key cache hits:
https://issues.apache.org/jira/browse/CASSANDRA-8525. That may explain
your ratios.
Can you try querying for a few non-existent
Hi Tyler,
I tried what you said and false positives look much more reasonable there.
Thanks for looking into this.
-Chris
- Original Message -
From: Tyler Hobbs ty...@datastax.com
To: user@cassandra.apache.org
Sent: Friday, December 19, 2014 1:25:29 PM
Subject: Re: High Bloom Filter
On Fri, Dec 19, 2014 at 12:25 AM, Jonas Borgström jo...@borgstrom.se
wrote:
Why would any streaming take place?
Simply changing the tokens and restarting a node does not seem to
trigger any streaming.
Oh, sorry for not reading the whole mail, I figured you were going to do
something less
On Thu, Dec 18, 2014 at 7:19 PM, Rajath Subramanyam rajat...@gmail.com
wrote:
Thanks Ken. Any other use cases where counters are used apart from
Rainbird ?
Disqus use(d? s?) them behind an in-memory accumulator which batches and
periodically flushes. This is the best way to use old counters.
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