Well, Amazon is expensive. Hetzner will sell you dedicated SSD RAID-1 servers
with 32GB RAM and 4 cores with HT for €59/mth. However, if pricing is an
issue, you could start with:
1 server : read at ONE, write at ONE, RF=1. You will have consistency, but not
high availability. This is the
Hi
I am researching various hash-tables and b-trees on disk.
while I researched, I has a thoughts about cassandra sstables that I want
to verify it here.
1. cassandra sstable uses sequential disk I/O when created. e.g. disk head
write it from the beginning to the end. Assuming the disk is not
2. when cassandra lookups a key in sstable (assuming bloom-filter and other
stuff failed, also assuming the key is located in this single sstable),
cassandra DO NOT USE sequential I/O. She probably will read the
hash-table slot or similar structure, then cassandra will do another disk
seek in
thanks
It will use the Index Sample (RAM) first, then it will use full Index
(disk) and finally it will read data from SSTable (disk). There's no such
thing like collision in this case.
so it still have 2 seeks :)
where I can see the internal structure of the sstable i tried to find it
I'm not sure how accurate it is (it's from 2011, one of its sources is
from 2010), but I'm pretty sure it's more or less OK:
http://blog.csdn.net/firecoder/article/details/7019435
M.
W dniu 07.08.2013 10:34, Nikolay Mihaylov pisze:
thanks
It will use the Index Sample (RAM) first, then it
Morning folks,
For the last couple of days all of my nodes (17, all running 1.2.8) have
been stuck at various percentages of completion for compacting
system.hints. I've tried restarting the nodes (including a full rolling
restart of the cluster) to no avail.
When I turn on Debugging I am
Hello,
please see these issues:
https://issues.apache.org/jira/browse/CASSANDRA-5686 and
https://issues.apache.org/jira/browse/CASSANDRA-5391 if you hit any of them.
regards,
ondrej cernos
On Wed, Aug 7, 2013 at 5:00 PM, Madalina Matei madalinaima...@gmail.comwrote:
Hi,
I have a 5 nodes
Quick question about systems architecture.
Would it be better to run 5 nodes with 7GB RAM and 4CPU's or 10 nodes with
3.5GB RAM and 2CPUS?
I'm currently running the former, but am considering the latter. My goal would
be to improve overall performance by spreading the IO across more disks.
You still have the same amount of RAM, so you cache the same amount of
data. I don't think you gain much here. On the other side, maintenance
procedures (compaction, repair) may hit your 2CPU box. I wouldn't do it.
Thank you,
Andrey
On Wed, Aug 7, 2013 at 10:24 AM, Paul Ingalls
As for the atomic increment, I take the answer is 'no, there is no atomic
increment, I have to pull the value to the client and send an update with the
new value'.
Saying atomic increment is probably confusing.
You cannot have Counters, the thing most people would think about when you say
I think on of the versions of ops centre has the feature
http://www.datastax.com/what-we-offer/products-services/datastax-opscenter
otherwise people use the cassandra-cli or cqlsh.
Cheers
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
Thrift and ClientState are both unrelated to hints.
What do you see in the logs after Started hinted handoff for
host:... from HintedHandoffManager?
It should either have an error message or something along the lines of
Finished hinted handoff of:...
Where there any schema updates that preceded
Thanks for the update :)
A
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 7/08/2013, at 7:03 AM, sankalp kohli kohlisank...@gmail.com wrote:
@Aaron
This problem happens when you drop and recreate a keyspace with the same name
Nate,
We had a node that was flaking on us last week and had a lot of handoffs
fail to that node. We ended up decommissioning that node entirely. I
can't find the actual error we were getting at the time (logs have been
rotated out), but currently we're not seeing any errors there.
We haven't
OpsCenter allows CRUD of column families themselves (although not CQL3
column families). It only allows viewing the data inside column families
though, no support for writing or updating.
On Wed, Aug 7, 2013 at 12:54 PM, Aaron Morton aa...@thelastpickle.comwrote:
I think on of the versions of
Thanks Nick for your reply. Good to know that. I knew OpsCenter was mainly
schema management.
Best Regards,
-Tony
From: Nick Bailey n...@datastax.com
To: user@cassandra.apache.org
Sent: Wednesday, August 7, 2013 12:04 PM
Subject: Re: Any good GUI based tool
Is there anything else on the network that could be attempting to
connect to 9160?
That is the exact error you would get when someone initiates a
connection and sends a null byte. You can reproduce it thusly:
echo -n 'm' | nc localhost 9160
On Wed, Aug 7, 2013 at 11:11 AM, David McNelis
Fwiw, similar to another issue of stuck compaction that was on the list
several days ago, if I cleared out the hints, either by removing files
while node was down, or running a scrub on system.hints during node
startup, I was able to get these compactions cleared, an the nodes are
starting to get
When looking at nodetool
gossipinfo, I notice that this node has updated to the latest schema hash, but
that it thinks other nodes in the cluster are on the older version.
What does describe cluster in cassandra-cli say ? It will let you know if there
are multiple schema versions in the
Some background on the read and write paths, some of the extra details are a
little out of date but mostly correct in 1.2
http://www.slideshare.net/aaronmorton/cassandra-community-webinar-introduction-to-apache-cassandra-12-20353118/40
Thanks Aaron. The node that was behaving this way was a production node so I
had to take some drastic measures to get it back to doing the right thing. It's
no longer behaving this way after wiping the system tables and having cassandra
resync the schema from other nodes. In hindsight, maybe I
And by that last statement, I mean are there any further things I should look
for given the information in my response? I'll definitely look at implementing
your suggestions and see what I can find.
On Aug 7, 2013, at 7:31 PM, Faraaz Sareshwala fsareshw...@quantcast.com
wrote:
Thanks Aaron.
On Wed, Aug 7, 2013 at 10:47 AM, Aaron Morton aa...@thelastpickle.comwrote:
As for the atomic increment, I take the answer is 'no, there is no atomic
increment, I have to pull the value to the client and send an update with
the new value'.
Saying atomic increment is probably confusing.
You
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