I keep thinking about the usage of cassandra timestamps and feel that for a
lot of applications swallowing a 2-4x additional cost to to memory might be
a nonstarter.
Has there been any discussion of using alternative date encodings?
Maybe 1ms resolution is too high ….. perhaps 10ms resolution?
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?
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
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
Hi,
I have a standard CF that has column start and end. I need to query its
rows using condition start10 and end100. 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, how the
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
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On Mon, Aug 29, 2011 at 1:23 PM, Stanislav Vodetskyi
stanislav.vodets...@globallogic.com wrote:
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On Sat, Aug 13, 2011 at 9:38 AM, Boris Yen yulin...@gmail.com 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
Thanks
On Mon, Aug 29, 2011 at 2:38 PM, Joris van der Wel jo...@jorisvanderwel.com
wrote:
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On Mon, Aug 29, 2011 at 1:23 PM, Stanislav Vodetskyi
stanislav.vodets...@globallogic.com wrote:
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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
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
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
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,
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:
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
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 if
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
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,
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.
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
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
anthony.ikeda@gmail.com wrote:
Is there currently a way to query a composite key in cassandra-cli?
I was
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 springri...@gmail.com wrote:
just found the data dir consume a lot of space, which is because there was
many snapshots in it.
but I have set
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
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 jbel...@gmail.com wrote:
Perhaps you are seeing auto-snapshots before destructive events such
as truncate or drop CF/KS.
On Mon, Aug 29, 2011
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.
On Mon, Aug 29, 2011 at 8:04 PM, Derek Andree dand...@lacunasystems.com 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
No.
On Mon, Aug 29, 2011 at 8:15 PM, Yan Chunlu springri...@gmail.com 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 jbel...@gmail.com wrote:
Perhaps you are seeing auto-snapshots
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
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 ol...@cloudorange.com wrote:
Hi,
After installing Cassandra 0.8 I discovered that my app stopped working. The
issue is that the app is now
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
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 jbel...@gmail.com
On Mon, Aug 29, 2011 at 4:56 PM, Peter Schuller peter.schul...@infidyne.com
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
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
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