We're seeing RAM usage continually climb until eventually, cassandra becomes
unresponsive.
The JVM isn't OOM'ing. It has only committed 14/24GB of memory. So, I am
assuming that the memory usage is related to mmap'd IO. Fair assumption?
I tried setting the IO mode to standard, but it seemed to
On Tue, May 25, 2010 at 6:35 PM, Jeremy Hanna
jeremy.hanna1...@gmail.com wrote:
What is the use case?
we end up with messed up data in the database, we run a mapreduce job
to find irregular data from time to time.
Why are you using Cassandra versus using data stored in HDFS or HBase?
as of
On Wed, May 26, 2010 at 8:00 PM, Sean Bridges sean.brid...@gmail.com wrote:
So after CASSANDRA-579, anti compaction won't be done on the source node,
and we can use more than 50% of the disk space if we use multiple column
families?
Sorry if I misunderstand, but #579 seems to only solve half
Hi,
I am trying to use batch_mutate() with PHP Thrift. I was getting the
following error.
*Fatal error*: Uncaught exception 'cassandra_InvalidRequestException'
in CORE/php/phpcassa/thrift/packages/cassandra/Cassandra.php:4869
Stack trace:
#0
Hi,
Just to clarify. Are you trying to insert a couple of columns with key
cache_pages in the ColumnFamily Page?
Moses Dinakaran wrote:
i,
I am trying to use batch_mutate() with PHP Thrift. I was getting the
following error.
A lot of folks have reported this issue, and there are a few JIRAs related
to it. Post the output of nodetool tpstats. Also, are there lots of GCs in
the system.log? If so, are they something besides ParNew?
Ian
On Thu, May 27, 2010 at 2:32 AM, James Golick jamesgol...@gmail.com wrote:
Saw some behaviour today on Cassandra 0.6.1 -
After running a remove command on a row in a CF whose CompareWith was
BytesType the row was still there, and still there after bouncing the
server. This was the case for hector/cli. When I changed the CompareWith
to UTF8Type, new rows added could
Could you clarify what you mean by remove command? Remove all columns leaving
a row key?
Did you use nodetool to force a flush and then compact after GCGraceSeconds?
On May 27, 2010, at 9:27 AM, Bill de hOra wrote:
Saw some behaviour today on Cassandra 0.6.1 -
After running a remove
Yes, #16 (which is almost done for 0.7) will make this possible.
On Wed, May 26, 2010 at 7:52 PM, Richard West r...@clearchaos.com wrote:
Hi all,
I'm currently looking at new database options for a URL shortener in order
to scale well with increased traffic as we add new features. Cassandra
you need to pull out the exception why field, which explains what
was invalid about the request
On Thu, May 27, 2010 at 2:45 AM, Moses Dinakaran
mosesdinaka...@gmail.com wrote:
Hi,
I am trying to use batch_mutate() with PHP Thrift. I was getting the
following error.
Fatal error:
remove to a full row doesn't touch comparewith at all. I think that's
a red herring. More likely data in that row was created with a
higher-res timestamp than the delete was issued at.
On Thu, May 27, 2010 at 7:27 AM, Bill de hOra b...@dehora.net wrote:
Saw some behaviour today on Cassandra
Just upgraded to Sun JVM 1.6.0_20 and cassandra 0.6.2. Will report back when
I have data.
On Thu, May 27, 2010 at 9:39 AM, Philip Stanhope pstanh...@wimba.comwrote:
I've seen numerous anecdotal references that the Sun JVM performs better.
Is there a reason why the debian packaging for
On Thu, May 27, 2010 at 08:04:18AM -0600, Jonathan Ellis wrote:
This is a relic of when Gossip was over UDP and had to worry about
packet size. I created
https://issues.apache.org/jira/browse/CASSANDRA-1138 to remove those
notifications.
Ahh, okay, well its odd that a limit was set even
Hi
Im trying to use Hector client to insert and then read the data from
cassandra. While im able to write the data and able to see that thru
cassandra-client cli, im not able to read that from the program.
Getting following error. What am in doing wrong in my program. Can someone
help me here
Is there anything holding you back from using it (if you would like to use
it but currently cannot)?
It would be nice if the output of the mapreduce job was a
MutationOutputFormat in which we could write insert/delete, but I
recall there is something on jira already albeit not sure if it
Hi Philip,
I think they chose to go with OpenJDK bc Sun's is not open source.
Here's what we did on ubuntu 10.04 (if youre using a different debian distro,
you can prob do something very similar):
# this install gives us the convenient add-apt-repository command
sudo apt-get install
More likely data in that row was created with a
higher-res timestamp than the delete was issued at.
Indeed - the problem was nanos v millis with a bit of clock skew thrown
in :)
Bill
Jonathan Ellis wrote:
remove to a full row doesn't touch comparewith at all. I think that's
a red
Yes, Gossip goes through MD too.
On Thu, May 27, 2010 at 11:03 AM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
On Thu, May 27, 2010 at 08:04:18AM -0600, Jonathan Ellis wrote:
This is a relic of when Gossip was over UDP and had to worry about
packet size. I created
UnavailableException means all the nodes that should have this data, are down.
On Thu, May 27, 2010 at 12:01 PM, Atul Gosain atul.gos...@gmail.com wrote:
Forgot to attach the class .
On Thu, May 27, 2010 at 11:17 PM, Atul Gosain atul.gos...@gmail.com wrote:
Hi
Im trying to use Hector
JVM GC pause? If so the improved JVM options in 0.6.2 should help
some. Increasing heap size is also a good candidate to help.
On Thu, May 27, 2010 at 2:01 PM, Jones, Nick nick.jo...@amd.com wrote:
Hi everyone,
I'm using the Cassandra gem and have been trying to optimize inserting
400k-1M
Hello!
We have mail archive with one large CF for mail body. In our case, it's
easy to shard data to 5-10 CF by customer id. We like to do this because:
1) We get more manageable instances, because we have many small CF
instead of one multi-TB CF on each node.
2) Better disk space usage
I think this is because as an optimization Cassandra sends a read
request only to the closest replica and sends digest requests to other
replicas for read repair. The same replica is probably getting chosen
as the closest for all of your read requests. Maybe it would be a
useful improvement to
On Thu, May 27, 2010 at 9:23 PM, Sean Bridges sean.brid...@gmail.com wrote:
But doesn't having multiple similarly sized column families mean in-node
compaction does not require 50% of disk? Looking at compaction manager,
only 1 thread is doing a compaction, so we only need enough free disk
If this description is accurate, then it sounds like my only available
workaround would be to not use multiget() and instead issue multiple
get() calls to random nodes so that I can hit the other replicas.
Edmond
On Thu, May 27, 2010 at 2:36 PM, Cagatay Kavukcuoglu
caga...@kavukcuoglu.org
Correct Ran. It seems like the only way I'm going to get true mutations
in a single op is to use Cages. Thankfully a majority of our
application won't require it, just a few specialized components.
On Wed, 2010-05-26 at 12:57 +0300, Ran Tavory wrote:
The summary of your question is: is
Mongo has it too. It could save a lot of development time if one can figure
out porting Mongo's query API and stored javascript to Cassandra.
It would be great if scala's list comprehension can be facilitated to write
query-like code against Cassandra schema.
On Thu, May 27, 2010 at 11:05 AM,
Thanks for your help :)
On Thu, May 27, 2010 at 10:38 PM, Jonathan Ellis jbel...@gmail.com wrote:
It looks like you simply don't have a large enough heap for all the
in-flight data.
Low-hanging fruit includes
- upgrade to 0.6.2 (available from
I've secretly started working on this but nothing to show yet :( I'm
calling it SliceDiceReduce or SliceReduce.
The plan is to use the js thrift bindings I've added for 0.3 release
of thrift (out very soon?)
This will allow the supplied js to access the results like any other
thrift
I agree, I had more than filter results in mind.
Though I had envisioned the results to continue to use the
ListColumnOrSuperColumn (and not JSON). You could still create new result
columns that do not in any way exist in Cassandra, and you could still stuff
JSON in to any of result columns.
I
I'm interested in performing some simple performance tests on EC2. I
was thinking of using py_stress and Cassandra deployed on 3 servers with
one separate machine to run py_stress.
Are there any particular configuration settings I should use? I was
planning on changing the JVM heap size to
2) is correct, but for 1) I'm not sure what manageability improvements
you anticipate from dealing with multiple entities instead of one.
I'm not sure what you're thinking of for 3) but routing is done by key
only.
2010/5/27 Maxim Kramarenko maxi...@trackstudio.com:
Hello!
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