Hi,
Should I just run command (in Cassandra 0.5 source folder?) like:
patch –p1 –i 0001-Add-new-ExpiringColumn-class.patch
for all of the five patches in your ticket?
Well, actually I lied. The patches were made for a version a little after 0.5.
If you really want to try, I attach a version
My (very brief) testing of Lucandra over Cassandra 0.5 showed it uses
different rows for every term, requiring to do a large number of insert()
calls per document added. This was way too slow for my purposes Do you
know if anything has changed? (the schema, or if it uses some newer api
It looks like this will change with Cassandra 0.6 and the addition of the
batch_mutate method.
From
http://blog.sematext.com/2010/02/09/lucandra-a-cassandra-based-lucene-backend/
http://blog.sematext.com/2010/02/09/lucandra-a-cassandra-based-lucene-backend/
For writes Lucadra is comparatively
The only kind of freeze that makes sense there is your reads are i/o
bound and the extra disk activity is killing you. In that case the
fix is to add more RAM, or give less to the JVM so the OS can use more
for buffer cache.
On Thu, Feb 25, 2010 at 8:01 AM, Boris Shulman shulm...@gmail.com
Then you should check GC timing with -Xverbose:gc option (see:
http://wiki.apache.org/cassandra/RunningCassandra for how to modify
jvm options) for a correlation.
On Thu, Feb 25, 2010 at 8:09 AM, Boris Shulman shulm...@gmail.com wrote:
In these tests I perform only write operations, no reads.
I don't think it is gc related issue. There is no correlation between
gc times and the freeze times. More over I don't see any gc activity
that lasts for omre than o.03 sec. But there is a correlation between
disk flushing operations. I've noticed that the system freezes each
time when my commit
On Thu, 25 Feb 2010 08:56:25 -0600 Jonathan Ellis jbel...@gmail.com wrote:
JE Are you swapping?
JE http://spyced.blogspot.com/2010/01/linux-performance-basics.html
JE otherwise there's something wrong w/ your vm (?), disk i/o doesn't
JE block incoming writes in cassandra
If the user has enough
Hi,
Is it possible to attach a binary stream to a Cassandra DB ? I would like to
say is it possible to add a String containing a message, a serialized java
object ?
Kind regards,
Charles Moulliard
Senior Enterprise Architect
Apache Camel Committer
*
blog :
Hi,
So is there anyway to force distribution among DataFileDirectory entries
when you add a new one? Looking at the nodeprobe operations it seems like
repair which causes a major compaction might do it? I've tried shutting a
node down moving files around by hand and starting up, but the next
Cassandra always compacts to the directory with the most free space.
There is not a way to influence this.
Gary
On Thu, Feb 25, 2010 at 13:23, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
Hi,
So is there anyway to force distribution among DataFileDirectory entries
when you add a new
Compaction is why http://wiki.apache.org/cassandra/CassandraHardware
recommends raid0-ing if you are concerned about free disk space
limits.
On Thu, Feb 25, 2010 at 1:36 PM, Gary Dusbabek gdusba...@gmail.com wrote:
Cassandra always compacts to the directory with the most free space.
There is
How about the debug output?
On Thu, Feb 25, 2010 at 12:03 PM, Masood Mortazavi
masoodmortaz...@gmail.com wrote:
All nodes always agree on the ring.
In fact,
nodeprobe -host name ring
is probably one of commands and nodeprobe one of the the most reliable
tools in Cassandra, as far as I
What is the write and read consistency level for the CLI tool
cassandra-cli ?
Do the set and get commands in the cli allow the Consistency Level to
be specified for a given set or get?
Is there a current specification of CLI anywhere on the wiki?
( How are JIRA's related to the CLI tagged in
Cassandra column values are byte arrays. Turning your java object
into a byte[] is your responsibility. :)
On Thu, Feb 25, 2010 at 10:11 AM, Charles Moulliard
cmoulli...@gmail.com wrote:
Hi,
Is it possible to attach a binary stream to a Cassandra DB ? I would like to
say is it possible to
All nodes always agree on the ring.
In fact,
nodeprobe -host name ring
is probably one of commands and nodeprobe one of the the most reliable
tools in Cassandra, as far as I can tell.
These are good suggestions. Thanks.
(I don't know whether it is worth describing this in a JIRA as a bug. I
CLI uses CL.ONE for reads and writes.
It has no user-level documentation other than its help output.
On Thu, Feb 25, 2010 at 1:08 PM, Masood Mortazavi masoodmortaz...@gmail.com
wrote:
What is the write and read consistency level for the CLI tool
cassandra-cli ?
Do the set and get
Okay, so the disk sizing seems to make sense for what I am seeing, the
disk which seems to get all the data is the largest. On the new machines
which have 3 disks of equal size, compaction seems to be distributing
among the disks.
Raid0 would sort of defeat the purpose of being able to add
In the worst case, compaction combines them all into a single file
anyway. So I think your approach is flawed. It's designed to allow
adding capacity by adding nodes, not just by adding more space, or
your cpu / ram ratio will degrade.
On Thu, Feb 25, 2010 at 2:48 PM, Anthony Molinaro
What about the case where cpu and ram are underutilized, and your bottleneck
is disk io (which seems to often be the case in ec2), then adding more
spindles improves overall throughput of the system. I've actually tested
this when adding an additional ebs, and hand moving files around, then
On Wed, Feb 24, 2010 at 11:36 AM, Jonathan Ellis jbel...@gmail.com wrote:
the exception is unrelated, it's from the network layer (and is gone in 0.6)
Thanks.
How is the bulk loader suppose to be setup? I start Cassandra using a
given storage file with the local IP as the seed and thrift IP.
On Wed, Feb 24, 2010 at 11:36 AM, Jonathan Ellis jbel...@gmail.com wrote:
the exception is unrelated, it's from the network layer (and is gone in 0.6)
Any other ideas as to what could be causing this? I'm getting
inconsistent results between ingests. The sendOneWay method is called
a lot
Yes, that's going to hurt forward scans with no start column.
(Reverse scans, or scans that start with a known live column, will
still be fast b/c of the per-row column indexes.)
On Thu, Feb 25, 2010 at 8:56 PM, Edmond Lau edm...@ooyala.com wrote:
Given that Cassandra needs to maintain
On Thu, Feb 25, 2010 at 3:54 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
What about the case where cpu and ram are underutilized, and your bottleneck
is disk io (which seems to often be the case in ec2), then adding more
spindles improves overall throughput of the system. I've
If I get to repeat it, I will certainly include standard output from the
servers assuming that's what you mean by the debug report
In the meantime, couldn't this behavior be caused by some bug in the CLI's
default consistency level.
(I've not checked the code in this case.)
It would be good
Thanks for the confirmation - that's what I suspected.
Edmond
On Thu, Feb 25, 2010 at 7:00 PM, Jonathan Ellis jbel...@gmail.com wrote:
Yes, that's going to hurt forward scans with no start column.
(Reverse scans, or scans that start with a known live column, will
still be fast b/c of the
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