Hi,
We're using Cassandra 0.8 counters in production and loving it!
One issue we're running into is we need an efficient mechanism to
retrieve the "top 100" results, sorted by count values.
We have tens of thousands of counters growing rapidly (one counter per
each combination of date.source
Sounds like this bug to me: https://issues.apache.org/jira/browse/CASSANDRA-3291
On Fri, Sep 30, 2011 at 8:18 PM, Yang wrote:
> at start up, I see these errors in system.log, after all the commitlog
> has been replayed.
>
>
>
>
> INFO [HintedHandoff:1] 2011-10-01 01:14:58,127
> HintedHandOffMana
at start up, I see these errors in system.log, after all the commitlog
has been replayed.
INFO [HintedHandoff:1] 2011-10-01 01:14:58,127
HintedHandOffManager.java (line 259) Started hinted handoff for token:
801411834
60469231731687303715884105728 with IP: /10.71.21.46
ERROR [HintedHandoff:1]
Thanks for testing this, Radim. We have a fix posted now to
https://issues.apache.org/jira/browse/CASSANDRA-3288.
On Fri, Sep 30, 2011 at 3:30 PM, Radim Kolar wrote:
> also some exceptions on cassandra side:
>
> Caused by: java.lang.IllegalArgumentException: value already present: 0
> at
bad news. using old hector breaks cassandra and it no longer boots.
ERROR [main] 2011-09-30 22:31:43,914 AbstractCassandraDaemon.java (line
354) Exc
eption encountered during startup
java.lang.IllegalArgumentException: value already present: 0
at
com.google.common.base.Preconditions.ch
also some exceptions on cassandra side:
Caused by: java.lang.IllegalArgumentException: value already present: 0
at
com.google.common.base.Preconditions.checkArgument(Preconditions.java
:115)
at
com.google.common.collect.AbstractBiMap.putInBothMaps(AbstractBiMap.j
ava:111)
I know this topic has come up in the past. I'm currently working on a
set of Cassandra specific annotations that define key, keyspace and
column in my POJO's.
Instead of hand rolling lots of boiler plate code for creating the
keyspace, I prefer to annotate my POJO's and have the system do that
for
Caught:
me.prettyprint.hector.api.exceptions.HCassandraInternalException: Cassan
dra encountered an internal error processing this request:
TApplicationError typ
e: 6 message:Internal error processing system_add_column_family
me.prettyprint.hector.api.exceptions.HCassandraInternalException:
Cas
my young-gen pauses are fine, they are generally below 0.1 seconds,
for my application that's fine for me :)
(I do see pauses of other nature, much longer (20seconds), some due to
GC (full GC), which I'm still investigating)
2011/9/30 Jonathan Ellis :
> I think we found why you're seeing lots of
I think we found why you're seeing lots of young gen-based GC pauses... :)
2011/9/30 Yang :
> why?
>
> I thought bigger young gen would allow more objects to die (become
> non-reachable) before minor collection, so the minor collection cost
> is low. particularly it would allow you to merge more
why?
I thought bigger young gen would allow more objects to die (become
non-reachable) before minor collection, so the minor collection cost
is low. particularly it would allow you to merge more updates and not
consume memory (since old objects are released on GC)
bigger old gen would allow you
Is it? Heard that twitter uses 60G, if I have remembered correctly.
--Original Message--
From: Norman Maurer
To: user@cassandra.apache.org
To: i...@iyyang.com
Subject: Re: release mmap memory through jconsole?
Sent: Oct 1, 2011 12:55 AM
I would also not use such a big heap. I think most p
Hi,
For our Grails + Cassandra application's clean-DB-for-every-test needs, we
finally went back from using costly "truncate" calls to
"range-scans-and-delete" approach, and found such a great different between
the performance of the two approaches, that wrote a small blog post here
about it: "Gra
I would also not use such a big heap. I think most people will tell
you that 12G -16G is max to use.
Bye,
Norman
2011/9/30 Yi Yang :
> It is meaningless to release such memory. The counting includes the data you
> reached in the SSTable. Those data locates on your hard drive. So it is not
> the
It is meaningless to release such memory. The counting includes the data you
reached in the SSTable. Those data locates on your hard drive. So it is not the
RAM spaces you have actually used.
-Y.
--Original Message--
From: Yang
To: user@cassandra.apache.org
ReplyTo: user@cassandra.apache
I gave an -Xmx50G to my Cassandra java processs, now "top" shows its
virtual memory address space is 82G, is there
a way to release that memory through JMX ?
Thanks
Yang
Thank you Jonathan for your quick reply.
The reason I asked the question is because I have noticed some companies
have used Cassandra to store data (which needs frequent read writes )
in-memory and have used other databases for data which is less frequently
read/updated.
So this created my doubt in
It's possible we have a paging bug in sstable2json.
On Fri, Sep 30, 2011 at 10:29 AM, Scott Fines wrote:
> Hi all,
> I've been messing with sstable2json as a means of mass-exporting some data
> (mainly for backups, but also for some convenience trickery on an individual
> nodes' data). However, I
Short answer: no.
Longer: What problems do you hope to avoid by adding this complexity?
On Fri, Sep 30, 2011 at 9:45 AM, Ramesh S wrote:
>
>
> I have some data that would be read/write might be once during the entire
> session, like authentication info.
> When designing database with Cassandra i
Hi all,
I've been messing with sstable2json as a means of mass-exporting some data
(mainly for backups, but also for some convenience trickery on an individual
nodes' data). However, I've run into a situation where sstable2json appears to
be dumping out TONS of duplicate columns for a single ro
What part does not work?
2011/9/30 Radim Kolar :
> is there hector snapshot available for 1.0rc? Hector 0.8 do not works with
> it
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com
I have some data that would be read/write might be once during the entire
session, like authentication info.
When designing database with Cassandra is it advisable to keep the data that
is not frequently read/written to the database else where ?
Thank you
regards,
Ramesh
We are using 0.8.6
On 29/09/2011, at 21:19 PM, Jonathan Ellis wrote:
> Are you on a current Cassandra release? If not you could be seeing
> https://issues.apache.org/jira/browse/CASSANDRA-2870
>
> On Thu, Sep 29, 2011 at 7:02 PM, Anthony Ikeda
> wrote:
>> We seem to be having issues with out
I am using 0.8.6.
On Thu, Sep 29, 2011 at 11:10 PM, Yi Yang wrote:
> ** Which version are you using? In my memory 0.8.3 cannot do it correctly
> but later versions fixed the bug.
>
> 從我的 BlackBerry(R) 無線裝置
> --
> *From: * Ramesh S
> *Date: *Thu, 29 Sep 2011 15:23:29
Wanted to see if I still would similar exceptions if I lowered the load by
reducing the replication factor.
I saw that in the log files a lot of 'GC parNew' messages and started a
complete new run (empty database) with smaller JVM -Xmn1000M and with
replication factor 1 (before it was 3).
Curren
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