My question:
what the client would get, when following happens:(RF=3, N=3)
1, write with timestamp T and succeed in all nodes.
2, delete with timestamp T+1, CL=Q, and succeed in node1 and node2 but failed
in node3.
3, force flush + compaction
4, read CL=Q
Does the client will get the row and
2011/3/10 Wangpei (Peter) peter.wang...@huawei.com
My question:
what the client would get, when following happens:(RF=3, N=3)
1, write with timestamp T and succeed in all nodes.
2, delete with timestamp T+1, CL=Q, and succeed in node1 and node2 but
failed in node3.
3, force flush +
Howdi,
Assortment of questions relating to an upgrade combined with a
possible migration between Data Centers (or perhaps a multi-DC
redesign). Apologies if some of these have been asked before - I
have kept half an eye on the list in recent times but haven't seen
anything covering these
Hi,
I am in the middle of some load testing on a 1-node Cassandra setup. We are
not on very high loads yet. We have recorded the timings taken up by
mutator.execute() calls and we see this kind of variation during the test
run:
So, 25% of the times, execute() calls come back in 25 milli-seconds,
Hi,
I'm stil fighting the
Exception in thread main java.lang.IllegalStateException:
replication factor (3) exceeds number of endpoints (2).
When I have a 2-server cluster, create Keyspace with RF 3, I'm able to
add (without auto_bootstrap) another node but cluster nodetool
commands don't work
Sounds like GC from your description of fast-slow-fast. Collect GC times
from both the client and server side and plot against your application
timing.
If you uncomment the verbose GC entries in the cassandra-env.sh file you
should get timing for the server side, pass in the same arguments for
Environment: Cassandra 0.7.0 , C++ Thrift client on windows
I have a column family with a secondary index
ColumnFamily: Page
Columns sorted by: org.apache.cassandra.db.marshal.BytesType
Built indexes: [Page.index_domain, Page.index_content_size]
Column Metadata:
Column
I think it would be very useful to get to the bottom of this but
without further details (like the asked for GC logs) I'm not sure what
to do/suggest.
It's clear that a single CF with a 64 MB memtable flush threshold and
without key cache and row cache and some bulk insertion, should not be
If you read the bugs I linked, you would see that this is expected
behavior with 0.7.3 once you get more data than you can index
in-memory.
You should wait for the next Hudson build (which will include 2295)
and use that. Or, create your indexes before adding the data.
On Thu, Mar 10, 2011 at
That was it. Thanks thobbs :-) The queries work as expected now.
-Adi
On Thu, Mar 10, 2011 at 1:01 PM, Tyler Hobbs ty...@datastax.com wrote:
I looked again at the original
mcasandra wrote:
aaron morton wrote:
The issue I think you and Patrik are seeing occurs when you *remove*
nodes from the ring. The ring does not know if they are up or down. E.g.
you have a ring of 3 nodes, and add a keyspace with RF 3. Then for
whatever reason 2 nodes are removed
Reading the FAQ http://wiki.apache.org/cassandra/FAQ
http://wiki.apache.org/cassandra/FAQ
SSTables that are obsoleted by a compaction are deleted asynchronously
when the JVM performs a GC. You can force a GC from jconsole if necessary
How can i force the GC with a simple java commandline? Is
Two approaches here.
First the many columns approach. Have a super column called Email, for each
email address store the type as the column name and the email address as the
column name. In cassandra you can store information in the column names as well
as the column values. And you do not
http://wiki.apache.org/cassandra/FAQ#slows_down_after_lotso_inserts
Aaron
On 11 Mar 2011, at 05:08, sridhar basam wrote:
Sounds like GC from your description of fast-slow-fast. Collect GC times
from both the client and server side and plot against your application timing.
If you
hm. i use this approach and have secondary indexes configured on the
columns if i need to do a specific search for an address.
alternately, in the user cf, if you wanted to be very uncool, but
optimized for always retrieving the user email addresses, you could
have the uuid for the user record
Can you include this info...
- output from nodetool ring for all nodes so we can see whats in the ring
- what you've run on the node you are trying to bring in
- the nodetool command you are trying to run
- error logs
In general asking the cluster to replicate data more times than the number of
Sorry, I wasn't clear on the timeline of events. I started the index build
and then posted this message to the list. Once I read the links you posted,
I did expect the cluster to crash, but I let it run until it blew up anyway,
since I didn't really know how to stop the index build.
Which is
I do believe there is a fundamental issue with compactions allocating too much
memory and incurring too many garbage collections (at least with 0.6.12).
On nearly every Cassandra node I operate, garbage collections simply get out of
control during compactions of any reasonably sized CF (1GB). I
Drop the index, then restart once more. It shouldn't try to rebuild
the index after that.
On Thu, Mar 10, 2011 at 3:36 PM, Matt Kennedy stinkym...@gmail.com wrote:
Sorry, I wasn't clear on the timeline of events. I started the index build
and then posted this message to the list. Once I read
I am completely confused. I repeated same test after turning on
auto_bootstrap to true and it worked this time. I did it exactly same way
where I killed 2 nodes and this time it started with no issues.
Could it be because once auto_bootstrap is off it's off forever?
I am using hector and
Could it be because once auto_bootstrap is off it's off forever?
I am not entirely sure if this answers your question (I revisisted the
thread history but I'm a bit confused myself):
If by that you mean that given a node which was started with
auto_bootstrap=false, and it successfully joined the
Bootstrapping uses the same mechanisms as a repair to streams data from other
nodes. This can be a heavy weight process and you may want to control when it
starts.
Joining the ring just tells the other nodes you exists and this is your token.
And in general, except when initially setting
Great, that worked, thanks for your time.
On Thu, Mar 10, 2011 at 4:57 PM, Jonathan Ellis jbel...@gmail.com wrote:
Drop the index, then restart once more. It shouldn't try to rebuild
the index after that.
On Thu, Mar 10, 2011 at 3:36 PM, Matt Kennedy stinkym...@gmail.com
wrote:
Sorry, I
I have upgraded from 0.7.0 to 0.7.3. I then run nodetool scrub on my
keyspace and now see this exception:
Exception in thread main java.io.IOError: java.io.IOException: Cannot run
program ln: java.io.IOException: error=24, Too many open files
at
Tyler, as a collateral issue - I've been wondering for a while what advantage
if any it buys me, if I declare a value 'long' (which it roughly is) as
opposed to passing around strings. String is flattened onto a replica of
itself, I assume? No conversion? Maybe it even means better speed.
Thanks,
Hi All,
Thanks for the inputs. I will start investigating this morning with the help
of these.
Regards,
Roshan
On Fri, Mar 11, 2011 at 2:49 AM, aaron morton aa...@thelastpickle.comwrote:
http://wiki.apache.org/cassandra/FAQ#slows_down_after_lotso_inserts
After a reboot, cassandra spits out many lines on startup but then appears
to stall.
Worse, trying to run cassandra a second time stops immediately because of a
port problem:
apache-cassandra-0.7.3: sudo ./bin/cassandra -f -p pidfile
Password:
Error: Exception thrown by the agent :
Comments in-line.
On Mar 10, 2011, at 8:10 PM, Bob Futrelle wrote:
After a reboot, cassandra spits out many lines on startup but then appears to
stall.
Worse, trying to run cassandra a second time stops immediately because of a
port problem:
apache-cassandra-0.7.3: sudo
Hi All
Memory utilization reported by JCOnsole for Cassandra seems to be much
lesser than that reported by top (RES memory). Can someone explain this?
Maybe off topic but would appreciate a response.
--
Cheers
Bill
Unrelated to either upgrade or scrub. That just means you need to
install JNA to get native linking instead of having to fork to run ln.
On Thu, Mar 10, 2011 at 5:54 PM, Stu King s...@stuartrexking.com wrote:
I have upgraded from 0.7.0 to 0.7.3. I then run nodetool scrub on my
keyspace and now
http://wiki.apache.org/cassandra/FAQ#mmap
On Thu, Mar 10, 2011 at 8:26 PM, Bill Hastings bllhasti...@gmail.com wrote:
Hi All
Memory utilization reported by JCOnsole for Cassandra seems to be much
lesser than that reported by top (RES memory). Can someone explain this?
Maybe off topic but
I see the same behavior with smaller batch sizes. It appears to happen
when starting Cassandra with the defaults on relatively large systems.
Attached is a script I created to reproduce the problem. (usage:
mutate.sh /path/to/apache-cassandra-0.7.3-bin.tar.gz) It extracts a
stock
Now that I've made the JMX_PORT change cassandra will attempt to run.
(Dumb me, I didn't need to ask - the answer about changing JMX_PORT was
already in the archives. I'm getting with it now, so I know to look there
first. Just finding my way around cassandra)
Made the change:
I tried the tutorial on this site -
http://www.datastax.com/docs/0.7/data_model/secondary_indexes and worked on
creating an index on a new column. That went good. But when I indexed an
existing column, my query below returns 0 row where in fact it should return 1.
Query:
get users where state
https://issues.apache.org/jira/browse/CASSANDRA-2244
On Thu, Mar 10, 2011 at 9:28 PM, Rommel Garcia groups.no...@gmail.com wrote:
I tried the tutorial on this site
- http://www.datastax.com/docs/0.7/data_model/secondary_indexes and worked
on creating an index on a new column. That went good.
Hi all,
I have a question about eventually consistency.
If there are 3 nodes and RF=3, Write-C=Quorum.
How long will all 3 nodes data sync?
Does any configuration can change that?
Thanks in advance.
Vincent
This correspondence is from Cyberlink Corp. and is intended only for use by
I thought I read somewhere that Pig has an output format that can write
to Cassandra but I am unable to find any documentation on this. Is this
possible and if so can someone please point me in the right direction.
Thanks
On its way... https://issues.apache.org/jira/browse/CASSANDRA-1828
On Mar 10, 2011, at 11:17 PM, Mark wrote:
I thought I read somewhere that Pig has an output format that can write to
Cassandra but I am unable to find any documentation on this. Is this possible
and if so can someone please
Something else is using the port, perhaps an existing Cassandra process?
Use lsof -i | grep 7000 to see what is.
If you need to change it, you are looking for storage_port in the config.
Aaron
On 11/03/2011, at 3:43 PM, Bob Futrelle bob.futre...@gmail.com wrote:
Now that I've made the
Sweet! This is exactly what I was looking for and it looks like it was
just resolved.
Are there any working examples or documentation on this feature?
Thanks
On 3/10/11 8:57 PM, Matt Kennedy wrote:
On its way... https://issues.apache.org/jira/browse/CASSANDRA-1828
On Mar 10, 2011, at 11:17
There's pretty limited information on Cassandra's built-in secondary index
facility as is, but trying to find out why the secondary index has to have
low cardinality has been like finding a needle in a haystack..that is
floating somewhere in the Atlantic.
Can someone explain why low
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