What are the advantages/disadvantages of Cassandra over HBase?
Thanks Ran.
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On Mon, Mar 1, 2010 at 5:34 AM, HHB hubaghd...@yahoo.ca wrote:
What are the advantages/disadvantages of Cassandra over HBase?
Ease of setup: all nodes are the same.
No single point of failure: all nodes are the same.
Speed: http://www.brianfrankcooper.net/pubs/ycsb-v4.pdf
Richer model:
Hey,
What are the typical use cases for Cassandra?
How to know if I should use Cassandra or documents-based data bases like
CouchDB?
I'm working for an ISP (Internet Service Provider), do you think we can
employ Cassandra? and for what?
Thanks all for help and time.
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* We recommend adjusting the compaction threshold to 0, while the
import is running. After the import, you need
* to run `nodeprobe -host IP flush_binary Keyspace` on every
node, as this will flush the remaining data still left
* in memory to disk. Then it's recommended to adjust the
I get:
Min threshold must be at least 2
On Mon, Mar 1, 2010 at 8:55 AM, Brandon Williams dri...@gmail.com wrote:
On Mon, Mar 1, 2010 at 10:53 AM, Sonny Heer sonnyh...@gmail.com wrote:
* We recommend adjusting the compaction threshold to 0, while the
import is running. After the import, you
Hello Everyone,
Jonathan, Thanks for your advice :-)
I have started a loadbalance operation on a busy cassandra node.
The http://wiki.apache.org/cassandra/Operations web page indicates that
nodetool streams can
be used to monitor the status of the load balancing operation.
I can't seem to
nodetool is the 0.6 replacement for nodeprobe. the stream info is new
in that version.
(0.6 beta release is linked from
http://wiki.apache.org/cassandra/GettingStarted)
-Jonathan
On Mon, Mar 1, 2010 at 12:40 PM, Jon Graham sjclou...@gmail.com wrote:
Hello Everyone,
Jonathan, Thanks for
I've been looking at the source, but not quite find the things I'm looking
for, so I have a few
questions.
Are columns for a row stored in a serialized data structure on disk or
stored individually and
put into a data structure when the call is being made? Because of the slice
query, does that
Jonathan, Thanks for the quick reply.
After starting a loadbalance operation for about 30 minutes, I can see 3
ColumnFamily-tmp-Data, Filter and Index files
on a lightly loaded node. The Data file has a size of 2,147,483,647 (max
signed int) on the node being loaded. I hope I didn't run out of
Thanks Jonathan.
It seems like the load balance operation isn't moving. I haven't seen any
data file time changes in 2 hours and no location file time
changes in over an hour.
I can see a tcp port # 7000 opened on the node where I ran the loadbalance
command. It is connected to
port 39033 on the
Sorry about that!
Continuing:
And in that case when using rows as indexes instead of columns we only need
to read
that specific row and might be more efficient in that case than to read a
big row every
time?
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Regards Erik
In HBase you have table:row:family:key:val:version, which some people
might consider richer
Cassandra is actually table:family:row:key:val[:subval], where subvals are the
columns stored in a supercolumn (which can be easily arranged by timestamp to
give the versioned approach).
-Original
Hi there -
Is there a setting of storage config or some other *user-level* programmatic
means that would cause Cassandra not to write to disk?
\
- m.
On Mon, Mar 1, 2010 at 4:06 PM, Erik Holstad erikhols...@gmail.com wrote:
So that is kinda of what I want to do, but I want to go from
a row with multiple columns to multiple rows with one column
Right, and I'm trying to tell you that this is a bad idea unless you
are worried about exhausting
Hi,
I was just wondering what the process might be for removing an old
column family in 0.5.0.
Can I just update the config and restart the server?
Does it require stopping the entire cluster at once or can it be done
in a rolling fashion?
Once I update the config can I just delete all the
On Mon, Mar 1, 2010 at 4:41 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
Hi,
I was just wondering what the process might be for removing an old
column family in 0.5.0.
Can I just update the config and restart the server?
Yes, but make sure your commitlog is flushed first (and
On Mon, Mar 1, 2010 at 4:49 PM, Erik Holstad erikhols...@gmail.com wrote:
Haha!
Thanks. Well I'm z little bit worried about this but since the indexes are
pretty
small I don't think it is going to be too bad. But was mostly thinking about
performance and and having the index row as a
On Mon, Mar 1, 2010 at 3:18 PM, Jon Graham sjclou...@gmail.com wrote:
Thanks Jonathan.
It seems like the load balance operation isn't moving. I haven't seen any
data file time changes in 2 hours and no location file time
changes in over an hour.
I can see a tcp port # 7000 opened on the
On Mon, Mar 1, 2010 at 2:51 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Mon, Mar 1, 2010 at 4:49 PM, Erik Holstad erikhols...@gmail.com
wrote:
Haha!
Thanks. Well I'm z little bit worried about this but since the indexes
are
pretty
small I don't think it is going to be too bad. But
Then you definitely want one row, range queries are slower than we'd
like right now. (Ticket to fix that:
https://issues.apache.org/jira/browse/CASSANDRA-821)
On Mon, Mar 1, 2010 at 5:00 PM, Erik Holstad erikhols...@gmail.com wrote:
On Mon, Mar 1, 2010 at 2:51 PM, Jonathan Ellis
Hello,
I did find these exceptions. I issued the loadbalance command on node
192.168.2.10.
INFO [MESSAGING-SERVICE-POOL:3] 2010-03-01 10:34:40,764 TcpConnection.java
(line 315) Closing errored connection
java.nio.channels.SocketChannel[connected local=/192.168.2.10:55973 remote=/
On Mon, Mar 1, 2010 at 5:39 PM, Jon Graham sjclou...@gmail.com wrote:
Reached an EOL or something bizzare occured. Reading from: /192.168.2.13
BufferSizeRemaining: 16
This one is harmless
java.io.IOException: Value too large for defined data type
at
Dear all,
I tried to run ClientOnlyExample.java on contrib/client_only. But the code
did not run. The error is:
Exception in thread main java.lang.IndexOutOfBoundsException: Index: 0,
Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:571)
at
Could you give me the config file?
Thanks
On Mon, Mar 1, 2010 at 11:34 PM, Jonathan Ellis jbel...@gmail.com wrote:
That means it doesn't know any of your other nodes. Probably you
don't have it configured with a seed.
On Mon, Mar 1, 2010 at 9:31 PM, JKnight JKnight beukni...@gmail.com
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