Thanks aaron,
I also restarted Cassandra instance , but data is still there.., is there any
mechanism to claim storage?? if so can you please give some pointer on that.
`sagar
-Original Message-
From: Joshua Partogi [mailto:joshua.j...@gmail.com]
Sent: Thursday, March 03, 2011 4:45 AM
T
I want to use JConsole to look at the Cassandra's MBean's attributes (like
Memtable stats).
But since my Cassandra nodes are running on Amazon EC2 instances, I have to
use an ssh login with a ppk authentication file (when connecting via Putty,
anyway).
It looks like two popular approaches to esta
On Wed, Mar 2, 2011 at 2:51 PM, Peter Schuller
wrote:
> Cassandra is about as friendly as it can be with respect to
> fragmentation. All data is written sequentially and in bulk.
That said, there can be more than one thread writing at a time, which
doesn't help fragmentation. On the plus side, "m
Hi Aaron,
Does that mean the data will be deleted eventually? Does this also
depends on the compaction configuration?
Thanks.
On Thu, Mar 3, 2011 at 7:23 AM, Aaron Morton wrote:
> What exactly was the folder that was left in place? Dropping a keyspace does
> not physically delete the data immed
> Are there any details on how much of an issue fragmentation is (with
> Cassandra ) ?
> With all the merging and deletes that happen with during compactions,
> how does the disk fragmentation look like over time ? Any thumb-rules
> on how frequently and how to defrag ?
Cassandra is about as frien
Are there any details on how much of an issue fragmentation is (with
Cassandra ) ?
With all the merging and deletes that happen with during compactions,
how does the disk fragmentation look like over time ? Any thumb-rules
on how frequently and how to defrag ?
Thanks.
The seed list is also used as part of the Gossip round http://wiki.apache.org/cassandra/ArchitectureGossip I agree it's not critical to ensure all running nodes have the same running seed list. But it's definitely a good idea. Disclaimer: Learning more about the gossip protocol is on my to-do list
You do not need to restart when changing the seedlist of nodes that are up.
The seedlist is really only used when a node first starts. So if you modify
the list of seeds the changes will take effect whenever that node restarts,
exactly when they need to.
In 0.7 you can basically get away with igno
All nodes should have the correct configuration files. With the only difference
been the initial token.
Aaron
On 3/03/2011, at 6:18 AM, A J wrote:
> Hello,
> I am trying to setup a cluser (for the first time) of a few nodes. Had
> a few questions related to that.
>
> I want the following prop
What exactly was the folder that was left in place? Dropping a keyspace does
not physically delete the data immediately.
Aaron
On 3/03/2011, at 1:01 AM, Sagar Kohli wrote:
>
>
>
>
> Hi ,
>
>
>
> I am using Cassandra .70, I have dropped a sample keyspace using command
> “drop keyspac
Thanks! Please let me know if others have more suggestions.
In all feeling I get is to keep the images/docs off Cassandra. Flicks and
facebook seem to have mysqldb for meta data and actual photos are stored
somewhere else.
Looks like I need to search for hosting platform where data can be stored
I started a wiki page for those wishing to let people in the community know
about projects/products that integrate with Cassandra.
http://wiki.apache.org/cassandra/IntegrationPoints
So far listed there are projects like Hadoop (including Pig and hive),
Solr/Lucene, Flume, and Scribe.
If you wo
Hello,
I am trying to setup a cluser (for the first time) of a few nodes. Had
a few questions related to that.
I want the following properties in my cluster:
1. Not to use RP but BOP
2. Specify initial token myself on each node.
3. Change a few memtable defaults.
4. For Keyspaces to use NetworkTop
In case anyone is interested. Our problem revolved around one machine
having the phpcassa thrift patch, and the other did not. Its resolved now.
On Wed, Mar 2, 2011 at 10:25 AM, David McNelis
wrote:
> It looks like we are having an issue with the Thrift installation on the
> 'other' machine. W
It looks like we are having an issue with the Thrift installation on the
'other' machine. We spun up a cassandra instance on that machine and were
unable to connect locally through php, but I was able to connect from the
original cassandra machine with PHP. That sounds convoluted...but in short,
>>What are other options then <<
Several.
1. Mogilefs. Stores on filesystem but metadata in database (MySQL or
Postgres). Also has redundancy built in. Does not require RAID. No
SPOF. But I think it has too many moving parts and requires a few more
boxes than cassandra.
2. Ofcourse the good old Blo
OK, got it.
Tks for the explanation,
- Eric
On 2/03/2011 14:45, Ching-Cheng Chen wrote:
Stable order mean the keys will return in some kind of ordering (not
alphanumeric, not numeric,), just in certain order.
For example, if you use setKeys("","") as first batch call and you got
following res
We are able to telnet to port 9160, and didn't have any issues resolving the
target along those lines. So at this point, I don't think we're looking at
a firewall / network topology issue.
On Wed, Mar 2, 2011 at 8:54 AM, Sasha Dolgy wrote:
> i had a similar issue on windows and it came down to
When I do a
bin/nodetool -h localhost getcompactionthreshold MyKeySpace MyColumnFamily
I get the following(which is what I set the CF to)
Current compaction thresholds for MyKeySpace / MyColumnFamily:
min = 4, max = 24
when I run the cassandra-cli for my column family I see
Compaction min/max
i had a similar issue on windows and it came down to php not being
able to resolve the target ... the solution was to add an entry to the
hosts file ... of course, if there is a firewall blocking ... that's
your problem. can you telnet from remote server to cassandra server
on port 9160?
On Wed,
Morning folks,
I'm not sure if this is an issue with my setup of Cassandra, or with
phpCassathere is an open question on StackOverflow that is very similar
to what I am experiencing (1). In short, I can connect using PHP from the
same machine that Cassandra is running on. I can connect with
Stable order mean the keys will return in some kind of ordering (not
alphanumeric, not numeric,), just in certain order.
For example, if you use setKeys("","") as first batch call and you got
following result.
keyabc
key456
keydsg
key8jkg
keyag87
key45s
...
Then if you call with setKeys("keydsg"
Hi ,
I am using Cassandra .70, I have dropped a sample keyspace using command "drop
keyspace "
Command executed successfully but when I checked key space folder still exists
there,
Is there any other process to delete data from file system or Cassandra does it
automatically??
Thanks in advan
Hi,
I'm also facing the need to retrieve all row keys.
What do you mean with "stable" order?
From this thread, I understand paging method with RandomPartitioner will return
all keys (shuffled, but missing key, no double key).
This seems to have already told, but I prefer to double-check...
Tks
You can use PHP Solr Extension. It is a fully featured and light-weight
client.
http://www.php.net/manual/en/book.solr.php
Without the secondary indexes on columns in CFs within SCFs, the best
approach is to create query-specific CFs at the moment. In the end all comes
down to how simple you can
On Tue, Mar 1, 2011 at 10:36 PM, Shaun Cutts wrote:
> This isn't quite true, I think. RandomPartitioner uses MD5. So if you had
> 10^16 rows, you would have a 10^-6 chance of a collision, according to
> http://en.wikipedia.org/wiki/Birthday_attack ... and apparently MD5 isn't
> quite balanced, so
2011/3/2 Peter Schuller :
>> Is it advisable or ok to store photos, images and docs in cassandra where you
>> expect high volume of uploads and views?
>
> To diverge a bit from the direction the thread is going: You can
> definitely store large files in Cassandra. I would recommend against
> doing
ah, not sure how i didn't see this. sorry!
Is anyone actively using this approach? Have you recovered from a
failure ? Was it pain free?
-sd
On Tue, Mar 1, 2011 at 8:58 PM, Aaron Morton wrote:
> Does this help http://wiki.apache.org/cassandra/Operations#Backing_up_data
>
> Aaron
>
> On 2/03/
I took the advice from previous threads and use cassandra to hold
pointers to the files that are uploaded and other meta information.
Amazon S3 can be quite simple and pain free at times and was a great
cost-effective place for me to keep the large files... i have had some
great success already wit
> Is it advisable or ok to store photos, images and docs in cassandra where you
> expect high volume of uploads and views?
To diverge a bit from the direction the thread is going: You can
definitely store large files in Cassandra. I would recommend against
doing so by simply smacking entire files
I think too via Solr it'll be easier. Just need to google it. (if you have
links about Solr in php...)
I realize that i have to remove some dimension to my CF...
I thought it was possible to have SCF -> CF -> SC -> C:value having
secondary index on C but has i understood, secondary index on C on
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