okay, thanks!
On Mon, Sep 26, 2011 at 10:38 PM, Jonathan Ellis wrote:
> compaction throughput doesn't affect flushing or reads
>
> On Mon, Sep 26, 2011 at 7:40 AM, Yan Chunlu wrote:
> > I am using the default 16MB when running repair. but the disk io is still
> > quite high:
> > Device:
Try turning up the logging to DEBUG and watch the requests come through.
Check that the two inserts do indeed have different time stamps.
In cases of lost updates, timestamps are most often the cause of the kerfuffle.
btw, in this situation the commit log is a red hearing riding a scapegoat. D
Does not matter to much but are you looking to get all the columns for some
know keys (get_slice, multiget_slice) ? Or are you getting the columns for keys
within a range (get_range_slices)?
If you provide do a reversed query the server will skip to the "end" of the
column range. Here is some
Yes. All the stress tool does is flood data through the API, no real
processing or anything happens. So thrift reading/writing data should
be the majority of the CPU time...
On 09/26/2011 08:32 AM, Baskar Duraikannu wrote:
Hello -
I have been running read tests on Cassandra using "stress" t
Aaron
From the CPU samples report. Here is the parts of the CPU samples report
(-Xrunhprof:cpu=samples, depth=4).
TRACE 300668:
java.net.SocketInputStream.socketRead0(SocketInputStream.java:Unknown
line)
java.net.SocketInputStream.read(SocketInputStream.java:129)
org.a
it's the other way around…
row-key:
super-column:
(sub)column:
When using Create Column Family in the CLI:
key_validation_class applies to the row key
comparator applies to the super column (when using a Super Column
Family)
subcomparator applied
I'll be there from Tuesday night thru the weekend.
- wilson...@gmail.com, 310.320-7878
On Mon, Sep 26, 2011 at 4:55 PM, Dan Kuebrich wrote:
> I'll be at Surge on Thursday, would love to meet up. Anyone else planning
> to be there?
>
> On Sun, Sep 25, 2011 at 7:27 PM, Chris Burroughs
> wrote:
I'll be at Surge on Thursday, would love to meet up. Anyone else planning
to be there?
On Sun, Sep 25, 2011 at 7:27 PM, Chris Burroughs
wrote:
> Surge [1] is scalability focused conference in late September hosted in
> Baltimore. It's a pretty cool conference with a good mix of
> operationally
How are you deciding what is thrift ? Thrift is used to handle connections and
serialize / de-serialize off the wire.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 27/09/2011, at 2:32 AM, Baskar Duraikannu wrote:
> Hello
Looks like a mismatch between the key the index says should be at a certain
position in the date file and the key that is actually there.
I've not checked but scrub *may* fix this this. Try it and see.
(repair is for repairing consistency between nodes, scrub fixes local issues
with data. )
Thank you to all for the quick response. The test that fails is doing a
insert, another insert (to update data) and then a get to validate. If I
make multiple copies of the same test and execute them in succession,
different copies will fail on successive runs. Each test only has a
single get, so o
Sounds a lot like this to me:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Updates-lost-td6739612.html
On Mon, Sep 26, 2011 at 1:55 PM, Rick Whitesel (rwhitese) <
rwhit...@cisco.com> wrote:
> Hi All:
>
> ** **
>
> We have a simple junit test that inserts a column, immediat
Ever since upgrading to 0.8.6, my nodes' system.log is littered with
GCInspector logs such as these
INFO [ScheduledTasks:1] 2011-09-26 21:23:40,468 GCInspector.java (line 122)
GC for ParNew: 209 ms for 1 collections, 4747932608 used; max is 16838033408
INFO [ScheduledTasks:1] 2011-09-26 21:23:43,7
Waiting 10 seconds between the update and reading the updated data seems
to always work. Not waiting the 10 seconds will cause the test to
randomly pass or fail.
-Rick
From: Jim Ancona [mailto:j...@anconafamily.com]
Sent: Monday, September 26, 2011 3:04 PM
To: user@cassandra.apache.org
Su
Do you actually see the update occur if you wait for 10 seconds (as your
subject implies), or do you just see intermittent failures when running the
unit test? If it's the latter, are you sure that the update has a greater
timestamp than the insert? I've seen similar unit tests fail because because
Hi All:
We have a simple junit test that inserts a column, immediately updates
that column and then validates that the data updated. Cassandra is run
embedded in the unit test. Sometimes the test will pass, i.e. the
updated data is correct, and sometimes the test will fail. The
configuration is
Hi,
I am trying to use the range query to retrieve a bunch of columns in
reverse order. The API documentation has a parameter bool reversed which
should return the results when queried using keys in a reverse order.
Lets say my row has about 1500 columns with column names 1 to 1500, and I
query
Dne 26.9.2011 16:37, Jonathan Ellis napsal(a):
The seed names should match what the seeds advertise as
listen_address. I can't think of a reason host names shouldn't work,
I used DNS alias, that was probably reason why it didn't worked.
I would think that compaction_throughput_kb_per_sec does have indirect impact
on disk IO. High number means or setting it to 0 means there is no
throttling on how much IO is being performed. Wouldn't it impact normal
reads from disk during the time when disk IO or util is high which
compaction is t
Hi all,
Im trying to create a Threads SCF that will store message thread id's in date
order and i want to store the threadID => subject as the supercolumns. Please
correct me if im incorrect but my understanding of a super column family is as
follows:
Category: //row key
Timestamp: //Colu
dsh -g mycluster -c "nodetool -h localhost snapshot"
see http://www.netfort.gr.jp/~dancer/software/dsh.html.en
On Mon, Sep 26, 2011 at 8:36 AM, Oleg Proudnikov wrote:
> Hi,
>
> What is the easiest way to save/backup a single column family across the
> cluster
> and later reload it?
>
> Thank yo
compaction throughput doesn't affect flushing or reads
On Mon, Sep 26, 2011 at 7:40 AM, Yan Chunlu wrote:
> I am using the default 16MB when running repair. but the disk io is still
> quite high:
> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
> avgqu-sz await r_awa
The seed names should match what the seeds advertise as
listen_address. I can't think of a reason host names shouldn't work,
but as Peter said, using host names is a bad idea anyway.
2011/9/25 Radim Kolar :
> I just discovered that using host names for seed nodes in cassandra.yaml do
> not work.
Hi,
What is the easiest way to save/backup a single column family across the cluster
and later reload it?
Thank you very much,
Oleg
Hello -
I have been running read tests on Cassandra using "stress" tool. I have been
noticing that thrift seems to be taking lot of CPU over 70% when I look at the
"CPU samples" report. Is this normal?
CPU usage seems to go down by 5 to 10% when I change the RPC from "sync" to
"async". Is
I am using the default 16MB when running repair. but the disk io is still
quite high:
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
sdb 136.00 0.00 506.00 26.00 63430.00 5880.00 260.56
101.73 224.38
The Mojo team is pleased to announce the release of Mojo's Cassandra
Maven Plugin version 0.8.6-1.
Mojo's Cassandra Plugin is used when you want to install and control a
test instance of Apache Cassandra from within your Apache Maven build.
The Cassandra Plugin has the following goals.
* cassa
h. never mind, possibly the first 24 seconds delay was caused by GC,
the GC logging was not printed in system.log,
I found one line on stdout that possibly corresponds to that.
I found I left out the enable parallel remark param, let me add that and retry.
Thanks
Yang
On Mon, Sep 26, 2011
> I just discovered that using host names for seed nodes in cassandra.yaml do
> not work. This is done on purpose?
I believe so yes, to avoid relying on DNS to map correctly given that
everything else is based on IP address. (IIRC, someone chime in if
there is a different reason.)
--
/ Peter Sch
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