Certification is good when a community gets to the point that proverbial
management cannot easily discern between posers and those that know what
they are talking about. I hope one day Cassandra and it's community grows
to that point but as of now there is enough transparency in my opinion.
I wou
Does it really make sense?
If yes, I think Apache Cassandra Project (ASF) should offer Open
Certification. Other entity can offer courses, training materials.
Are there any organizations planning on offering certification for
Cassandra?
--
Salvador Fuentes Jr.
Did you try what it says to do first? "You need to restart this node
with -Dcassandra.renew_counter_id=true to fix."
On Sun, Aug 14, 2011 at 12:28 PM, Philippe wrote:
> Hi I'm getting the following at startup on one of the nodes on my 3 node
> cluster with RF=3.
> I have 6 keyspaces each with 10
Or leave row cache enabled but disable cache saving (and remove the
one already on disk).
On Sun, Aug 14, 2011 at 5:05 PM, aaron morton wrote:
> INFO [main] 2011-08-14 09:24:52,198 ColumnFamilyStore.java (line 547)
> completed loading (1744370 ms; 20 keys) row cache for COMMENT
>
> It's taki
There can be bugs in the trunk. Stuff can be put in and the taken out.
The tagged and packages releases are considered stable and supported. You can
run trunk in prod if you want to, it's good to get tested, but you will need to
pay attention to whats happening with the code base and be prepared
Multi threaded compaction helps there
https://issues.apache.org/jira/browse/CASSANDRA-2191
It's another reason to avoid major / manual compactions which create a single
big SSTable. Minor compactions keep things in buckets which means newer
SSTable can be compacted needing to read the bigger
It looks like the error was thrown during a minor compaction. There should be a
log line from the CompactionManager before hand that says "Compacting…" and
lists the SSTables it is going to compact. Check that it's from the same
thread, i.e. [CompactionExecutor:6] in the example below
With the
> INFO [main] 2011-08-14 09:24:52,198 ColumnFamilyStore.java (line 547)
> completed loading (1744370 ms; 20 keys) row cache for COMMENT
It's taking 29 minutes to load 200,000 rows in the row cache. Thats a pretty
big row cache, I would suggest reducing or disabling it.
Background
http://w
@Teijo : thanks for the procedure, I hope I won't have to do that
Peter, I'll answer inline. Thanks for the detailed answer.
> > the number of SSTables for some keyspaces goes dramatically up (from 3 or
> 4
> > to several dozens).
>
> Typically with a long running compaction, such as that trigge
Forgot to mention, you want to check the following in cassandra.yaml on the
node that you bootstrap before you initiate the bootstrap:
* Ensure that the initial_token is set to the correct value (see nodetool)
* Ensure that the seeds list doesn't contain the IP of the node you are trying
to boo
> oh i know you can run rf 3 on a 3 node cluster. more i thought that if you
> have one fail you have less nodes than the rf, so the cluster is at less
> than rf, and writes might be disabled or something like that, while at 4 you
> still have met the rf...
A node failing is independent of RF. *De
Sorry about the lack of response to your actual issue. I'm afraid I
don't have an exhaustive analysis, but some quick notes:
> balanced ring but the other nodes are at 60GB. Each repair basically
> generates thousands of pending compactions of various types (SSTable build,
> minor, major & validat
Hi,
I took the following steps to get a node that refused to repair back under
control.
WARNING: This resulted in some data loss for us, YMMV with your replication
factor
* Turn off all row & key caches via cassandra-cli
* Set "disk_access_mode: standard" in cassandra.yaml
* Kill Cassandra on
You can checkout libcassandra for a C++ client built on top of thrift. It is
not feature complete, but it is pretty good.
https://github.com/matkor/libcassandra
On Aug 14, 2011, at 3:59 AM, Konstantinos Chasapis wrote:
> Hi,
> Thank you for your answer. Is there any documentation that describ
Is there any good reason why shouldn't we build the latest version from
source?
Thanks!
On Fri, Aug 12, 2011 at 12:18 AM, aaron morton wrote:
> In a non dev system it's a lot easier to use the packages
> http://wiki.apache.org/cassandra/DebianPackaging
> http://www.datastax.com/docs/0.8/install/p
Hi,
As on-disk SSTables become bigger and bigger because more data is added in
the ring, compactions take longer and longer because each file is becoming
bigger.
Isn't there a time where compacting will take so long that compaction just
can't keep up with the amount of data ? It looks to me like t
No it depends on the consistency level. It's different : for example, QUORUM
= 2 for RF=3
Anyway, anyone have an answer to my real issue ?
Thanks
2011/8/14 Stephen Connolly
> oh i know you can run rf 3 on a 3 node cluster. more i thought that if you
> have one fail you have less nodes than the
Hi I'm getting the following at startup on one of the nodes on my 3 node
cluster with RF=3.
I have 6 keyspaces each with 10 column families that contain supercolumns
that contain only counter columns.
Looking at
http://www.datastax.com/dev/blog/whats-new-in-cassandra-0-8-part-2-countersI
see that
oh i know you can run rf 3 on a 3 node cluster. more i thought that if you
have one fail you have less nodes than the rf, so the cluster is at less
than rf, and writes might be disabled or something like that, while at 4 you
still have met the rf...
- Stephen
---
Sent from my Android phone, so ra
I got 3 nodes and RF=3, when I repairing ndoe3, it seems alot data
generated. and server can not afford the load then crashed.
after come back, node 3 can not return for more than 96 hours
for 34GB data, the node 2 could restart and back online within 1 hour.
I am not sure what's wrong with node
5 hours later, the number of pending compactions host up to 8k as usual, the
number of SST tables for another keyspace shot up to 160 (from 4).
At 4pm, a daily cron job that runs repair starts on that same node and all
of a sudden, the number of pending compactions went down to 4k and to number
of
Thanks for all the explanations.
It's odd, that pure range queries are not supported at this time. But I think
I'll find a solution for my problem.
Greetings
Original-Nachricht
> Datum: Sun, 14 Aug 2011 07:09:55 -0700
> Von: Jason Rutherglen
> An: user@cassandra.apache.org
>
> i am always wondering why people run clusters with number of nodes == rf
>
> i thought you needed to have number of nodes > rf ti gave any sensible
> behaviour... but i am no expert at all
No. The only requirement is that the number of nodes be >= RF, since
clearly in a cluster with fewer nodes
https://svn.apache.org/repos/asf/cassandra/branches/cassandra-0.8/interface/cassandra.thrift
On Sun, Aug 14, 2011 at 1:59 AM, Konstantinos Chasapis
wrote:
> Hi,
> Thank you for your answer. Is there any documentation that describes all
> this values that I have to set?
>
> Konstantinos Chasapis
>
i am always wondering why people run clusters with number of nodes == rf
i thought you needed to have number of nodes > rf ti gave any sensible
behaviour... but i am no expert at all
- Stephen
---
Sent from my Android phone, so random spelling mistakes, random nonsense
words and other nonsense a
This will be fully solved with CASSANDRA-2915 which will use Lucene as
a the secondary index type implementation. Lucene has extremely fast
range queries built in.
On Sun, Aug 14, 2011 at 6:38 AM, Sal Fuentes wrote:
> The important piece that is mentioned in Jonathan's link is this:
> "One conse
The important piece that is mentioned in Jonathan's link is this:
"One consequence of the KEYS index type being more like a hash index than a
btree is shown here: even though birth_date is indexed, Cassandra couldn’t
perform the range query “> 1970″ against it."
hash index vs a btree index. Basic
Hi Jens,
I have never used CQL myself and I have barely used Cassandra, but I
think I've seen it mentioned before on this list that you need to use
compare for equality on at least one column (as indicated by "No
indexed columns present in by-columns clause with "equals" operator").
The lookup wil
Looks like Chronologic is out now. Much thanks to the folks at Gowalla for
putting this out.
https://github.com/gowalla/chronologic
http://speakerdeck.com/u/therealadam/p/chronologic-you-put-your-feeds-in-it
http://lanyrd.com/2011/lone-star-ruby-conference/sgptd/
On Mon, Aug 8, 2011 at 1:30 PM,
I had indexed the number column in station column family. Do I also have to
index another column?
What I'm wondering, when I type "get station where number = 8210;" all works
fine, but when I type "get station where number < 8210;" I'll get mentioned
exception.
Is there something, that I misun
Hello, I've been fighting with my cluster for a couple days now... Running
0.8.1.3, using Hector and loadblancing requests across all nodes.
My question is : how do I get my node back under control so that it runs
like the other two nodes.
It's a 3 node, RF=3 cluster with reads & writes at LC=QUO
Hi,
Thank you for your answer. Is there any documentation that describes
all this values that I have to set?
Konstantinos Chasapis
On Aug 14, 2011, at 6:28 AM, Jonathan Ellis wrote:
In C++ you need to set .__isset.fieldname on optional fields (e.g.
.__isset.value).
2011/8/13 Hassapis Const
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