Hi
I notice that schematool was removed from the release of Cassandra 0.8. I would
like to know the reason of doing that and how i can load the schema from
configure file(like .yaml) automatically.
Best Regards!
Jenny
On Mon, Aug 29, 2011 at 4:56 PM, Peter Schuller wrote:
> > If the client sleeps for a few ms at each loop, the success rate
> > increases. At 15 ms, the script always succeeds so far. Interestingly,
> > the problem seems to be sensitive to alphabetical order. Updating the
> > value from 'aaa' to
thanks for the help. have you tried use those snapshot to recover a node?
I have not found anything related to those auto-created snapshots in the
wiki page, then dont even have a timestamp, not sure how to use those
files
On Tue, Aug 30, 2011 at 10:27 AM, Jonathan Ellis wrote:
> No.
>
>
Thanks Dan, good info.
> First off, what version of Cassandra are you using?
Sorry my bad, 0.8.4
> Provided you are using a recent Cassandra version (late 0.7 or 0.8.x) I doubt
> the commit log is your problem. My experience using Cassandra as a time
> series data store (with a full 30 days of
I answered this earlier today, so I added it to the FAQ:
http://wiki.apache.org/cassandra/FAQ#cli_keys
On Mon, Aug 29, 2011 at 9:31 PM, Oleg Proudnikov wrote:
> Hi,
>
> After installing Cassandra 0.8 I discovered that my app stopped working. The
> issue is that the app is now unable to read a row
Hi,
After installing Cassandra 0.8 I discovered that my app stopped working. The
issue is that the app is now unable to read a row that was inserted by a CLI set
command with a numeric string key.
CLI in Cassandra 0.8 seems to be treating literals inconsistently. Please let me
know if I am missin
No.
On Mon, Aug 29, 2011 at 8:15 PM, Yan Chunlu wrote:
> so it was useless? I didn't drop any CF/KS, could "nodetool move",
> "nodetool repair" cause the problem?
>
> On Tue, Aug 30, 2011 at 5:23 AM, Jonathan Ellis wrote:
>>
>> Perhaps you are seeing auto-snapshots before destructive events s
On Mon, Aug 29, 2011 at 8:04 PM, Derek Andree wrote:
> Is there an easy way to keep commit log size down without killing performance?
There is in 1.0: commitlog_total_space_in_mb, added in
https://issues.apache.org/jira/browse/CASSANDRA-2427.
Until then you'll have to make sure that you're flush
First off, what version of Cassandra are you using?
> We've noticed that when we restart cassandra disk utilization decreases
dramatically
Presumably you mean 'utilization' as in free space. Specifically on a
restart, this type of behavior is likely due to Cassandra deleting compacted
SSTables. C
so it was useless? I didn't drop any CF/KS, could "nodetool move",
"nodetool repair" cause the problem?
On Tue, Aug 30, 2011 at 5:23 AM, Jonathan Ellis wrote:
> Perhaps you are seeing auto-snapshots before destructive events such
> as truncate or drop CF/KS.
>
> On Mon, Aug 29, 2011 at 4:19 P
I run a single node cassandra instance, and we have lots of overwrites on a hot
CF and disk utilization seems to grow pretty fast. We've noticed that when we
restart cassandra disk utilization decreases dramatically (dramatic being
something close to 50%). Most of this growth seems to be in th
> If the client sleeps for a few ms at each loop, the success rate
> increases. At 15 ms, the script always succeeds so far. Interestingly,
> the problem seems to be sensitive to alphabetical order. Updating the
> value from 'aaa' to 'bbb' never has problem. No pause needed.
Is it possible the ver
Yeah I figured out what happened. I inadvertently set the keys to utf8 on
the column family:
assume ColumnFamily keys as utf8;
which broke whichever default mechanism was in place to perform the colon
separated values for the Composite key. When I restarted cassandra-cli, the
query worked again.
Perhaps you are seeing auto-snapshots before destructive events such
as truncate or drop CF/KS.
On Mon, Aug 29, 2011 at 4:19 PM, Yan Chunlu wrote:
> just found the data dir consume a lot of space, which is because there was
> many snapshots in it.
> but I have set snapshot_before_compaction: fals
Sounds like you need to specify a key_validation_class so the cli
knows how to encode the key. (It used to assume keys were always
ascii.)
On Mon, Aug 29, 2011 at 4:02 PM, Anthony Ikeda
wrote:
> Is there currently a way to query a composite key in cassandra-cli?
> I was sure I used to be able to
just found the data dir consume a lot of space, which is because there was
many snapshots in it.
but I have set snapshot_before_compaction: false. is that possible that
cassandra create those snapshot automatically? could I delete them?
the dir names is strange(normally it should contain date i
Hi,
Just started developing using Cassandra (0.8.4). I noticed when
updating the same row and column repeatedly, say, in a test case,
updates may get lost. I found it in a Java client but the following
python script also exhibits the same problem.
*
Is there currently a way to query a composite key in cassandra-cli?
I was sure I used to be able to call:
get ColumnFamily['comp1:comp2']
But this has recently stopped working.
Anthony
Hi,
I have an already running system where I define a simple data flow (using a
simple custom data flow language) and configure jobs to run against stored
data. I use quartz to schedule and run these jobs and the data exists on
various data stores (mainly Cassandra but some data exists in RDBMS li
queries start > 10 and end < 100 is not straight forward to modelize,
you should use the value of start as column name, and check on client
side the second condition.
Just for comparison, modeling 10 < value < 100 is rather much easier
if you set your values as column name, or using CompositeType
Hi,
The hardware you choose depends a bit on your workload - writes vs
reads, amount of cacheable data, latency requirements, etc.. What
sort of workload do you expect?
See http://wiki.apache.org/cassandra/CassandraHardware for some general advice.
People typically have 8-24 GB RAM per node wit
Hi,
I've written about this before, but I can't find the original thread.
I have one node on my 16 node cassandra cluster (running 8.1) that will
not stay running. All nodes were configured the same way, but this one
kept going down, so I changed these lines in my cassandra-env.sh:
JVM_OPT
Just wanted to let people know about a great presentation that Matt Dennis did
here at the Cassandra Austin meetup. It's on Cassandra best practices on EC2.
We found the presentation extremely helpful.
http://www.slideshare.net/mattdennis/cassandra-on-ec2
Hi,
This still leaves me puzzled.
Is it a bad thing?
Why is it happening?
And what does "blocked before being accepted" mean? Does it mean Cassandra did
not even try to put the task into a queue?
Thanks for enlightening me,
roland
-Ursprüngliche Nachricht-
Von: Jonathan Ellis [mail
Hello,
We are putting on some cassandra servers and using a loadbalancer to an
app connecting at the cluster.
My suggest is to change string that are returned from thrift status,
because some loadbalancers have a false positive status on we are
expecting "running" on healthcheck.
I suggest to
Hello guys,
What is the type of profile of a cassandra server.
Are SSD an option ?
Does cassandra needs better CPU ou lots of memory ?
Are SATA II disks ok ?
I am making some tests, and i started evaluating the possible hardware.
If someone already has conclusions about it, please share :D
Than
the javadoc for the mbeans explains:
/**
* Get the number of tasks that had blocked before being accepted (or
* rejected).
*/
public int getTotalBlockedTasks();
/**
* Get the number of tasks currently blocked, waiting to be accepted by
* the executor (because
Thanks
On Mon, Aug 29, 2011 at 2:38 PM, Joris van der Wel wrote:
> send a message to
>
> On Mon, Aug 29, 2011 at 1:23 PM, Stanislav Vodetskyi
> wrote:
> > unsubscribe
>
On Sat, Aug 13, 2011 at 9:38 AM, Boris Yen wrote:
> I posted a comment for Cassandra-3006 after 0.8.4 is released, but it seems
> not be noticed there, so I re-post here, wondering if anyone could help.
> ---
> Follow the same steps posted on Cassandra-3006, after step
send a message to
On Mon, Aug 29, 2011 at 1:23 PM, Stanislav Vodetskyi
wrote:
> unsubscribe
unsubscribe
I am not sure, but I think the problem might be "order preserving
partitioners" you used. When using "order preserving partitioners" data
might be skewed meaning most data only stay in a few servers, so that might
create a few heavy load servers.
On Mon, Aug 29, 2011 at 7:24 AM, Ryan Lowe wrote:
Hi,
I have a standard CF that has column "start" and "end". I need to query its
rows using condition "start>10 and end<100". Is there any better way to do it?
Using native secondary index or creating a specific CF for the search. I do not
know which one is better. If the late is preferred to, h
I have a patch for trunk which I just have to get time to test a bit before I
submit.
It is for super columns and will use the super columns timestamp as the base
and only store variant encoded offsets in the underlying columns.
If the timestamp equals that of the SC, it will store nothing (ju
Hi all,
On a 0.7.8 cluster In tpstats i can see flushwriter stage having several tasks
in state all-time-blocked (immendiatly after node restart its 8 but grows over
time to around 300). What does it mean (or how can I find out) and what can I
do about it?
--
YOOCHOOSE GmbH
Roland Gude
Softwa
> Using 4 bytes and 100ms resolution your can fit in 13 years of
timestamps if you use the time you deploy the cassandra DB (aka 'now')
as epoch.
In our app we will be fine with this. 100ms is good enough.
we can probably do some garbage collection on timestamps like we do on
deletes. If times
> If I have a cluster with 15-20T nodes, somethings that I know will be a
> potential problem are
>
> Compactions taking longer
> Higher read latencies
> Long time for adding/removing nodes
>
> What are other things that can be problematic with big nodes?
http://wiki.apache.org/cassandra/LargeData
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