On Sat, Apr 24, 2010 at 6:27 AM, Carlos Sanchez
carlos.sanc...@riskmetrics.com wrote:
There are forEach methods in that would allow you to travel the
keys/values/entries w/o creating the extra object (entries)
Ok. So if change was made, it'd make sense to ensure those were used
for traversal.
On 25 April 2010 10:48, JKnight JKnight beukni...@gmail.com wrote:
Dear all,
My Cassandra server had thread leak when high concurrent load. I used
jconsole and saw many, many thread occur.
Just because there are a lot of threads, need not imply a thread leak.
Cassandra uses a lot of
For me an important difference is that Cassandra is operationally much more
straightforward - there is only one type of node, and it is fully redundant
(depending what consistency level you're using).
This seems to be an advantage in Cassandra vs most other distributed storage
systems, which
I encountered the same problem! Hope to get some help.Tks.
2010/4/22 Ingram Chen ingramc...@gmail.com
arh! That's right.
I check OutboundTcpConnection and it only does closeSocket() after
something went wrong. I will log more in OutboundTcpConnection to see what
actually happens.
Thank
On Apr 25, 2010, at 11:40 AM, Mark Robson wrote:
For me an important difference is that Cassandra is operationally much more
straightforward - there is only one type of node, and it is fully redundant
(depending what consistency level you're using).
This seems to be an advantage in
great that worked thanks!
On Fri, Apr 23, 2010 at 2:28 PM, Mark Greene green...@gmail.com wrote:
Try the
cassandra-with-fixes.bathttps://issues.apache.org/jira/secure/attachment/12442349/cassandra-with-fixes.bat
file
attached to the issue. I had the same issue an that bat file got
On 25 apr 2010, at 15.15em, S Ahmed wrote:
Ok excited I got it up and running on windows 7, yah!
Curious, are there any tutorials or examples of using the cassandra-cli?
http://wiki.apache.org/cassandra/CassandraCli
BTW, the cassandra-cli is pretty cool, even comes with tab-complete, is
I second Joe.
Lenin
Sent from my BlackBerry® wireless handheld
-Original Message-
From: Joe Stump j...@joestump.net
Date: Sun, 25 Apr 2010 13:04:50
To: user@cassandra.apache.org
Subject: Re: The Difference Between Cassandra and HBase
On Apr 25, 2010, at 11:40 AM, Mark Robson wrote:
Out of curiosity, are you planning on copying the data you store in
HBase/Hive into separate Hadoop cluster in a different data center or
backing up HDFS in some other manner? Redundancy isn't an issue within the
cluster; it's more a concern of storing all your HDFS data in one physical
location.
HBase is awesome when you need high throughput and don't care so much
about latency. Cassandra is generally the opposite. They are
wonderfully complementary.
--
Jeff
On Sun, Apr 25, 2010 at 8:19 AM, Lenin Gali galile...@gmail.com wrote:
I second Joe.
Lenin
Sent from my BlackBerry® wireless
On Apr 25, 2010, at 5:18 PM, Eric Hauser wrote:
Out of curiosity, are you planning on copying the data you store in
HBase/Hive into separate Hadoop cluster in a different data center or backing
up HDFS in some other manner? Redundancy isn't an issue within the cluster;
it's more a
it is kind of the classic distinction between OLTP OLAP.
Cassandra is to OLTP as HBase is to OLAP (for those SAT nutz).
Both are useful and valuable in their own right, agreed.
On Sun, Apr 25, 2010 at 12:20 PM, Jeff Hodges jhod...@twitter.com wrote:
HBase is awesome when you need high
Hello Cassandra Users,
When use the RandomPartinionner and a simple ColumnFamily/Columns (i.e.
no SuperColumns) my understanding is that one signle Row can store
millions of columns.
If I look at the http://wiki.apache.org/cassandra/API, I understand that
I can get a subset of the millions
Thanks Robson,
The number of thread gradually increase to 7000. And the server hang up.
I know threadpool is used to prevent creating large number of thread.
So why Cassandra create large number of thread when high concurrent load.
On Sun, Apr 25, 2010 at 5:38 PM, Mark Robson mar...@gmail.com
Hi,
I'm new to Cassandra and trying to work out how to do something that I've
implemented any number of times (e.g. TokyoCabinet, Perst, even the filesystem
using grep :-) I've managed to get some of this working in Cassandra but not
all.
So here's the core of the situation.
I have this
On Sun, Apr 25, 2010 at 12:09 PM, JKnight JKnight beukni...@gmail.comwrote:
Thanks Robson,
The number of thread gradually increase to 7000. And the server hang up.
I know threadpool is used to prevent creating large number of thread.
So why Cassandra create large number of thread when high
The indexes within rows are _not_ implemented with Lucene: there is a custom
index structure that allows for random access within a row. But, you should
probably read http://wiki.apache.org/cassandra/CassandraLimitations to
understand the current limitations of the file format, some of which
Is there a suggested sized maximum that you can set the value of a given
key?
e.g. could I convert a document to bytes and store it as a value to a key?
if yes, which I presume so, what if the file is 10mb? or 100mb?
http://wiki.apache.org/cassandra/CassandraLimitations
On Sun, Apr 25, 2010 at 4:19 PM, S Ahmed sahmed1...@gmail.com wrote:
Is there a suggested sized maximum that you can set the value of a given
key?
e.g. could I convert a document to bytes and store it as a value to a key?
if yes, which
Hi all!
I am trying to do a paginated query on the subcolumns of a superfamily
column but sincerely I am a little bit confused.
I have already been able to do a range query but only over the keys of a
regular column family.
For the keys case I've been able to do so using the code below:
On Sat, Apr 24, 2010 at 2:08 AM, Sylvain Lebresne sylv...@yakaz.com wrote:
On Sat, Apr 24, 2010 at 12:53 AM, Jesse McConnell
jesse.mcconn...@gmail.com wrote:
try LexicalUUIDType, that will distinguish the secs correctly
imo based on the existing impl (last I checked at least) TimeUUIDType
On Sun, Apr 25, 2010 at 5:40 PM, Tatu Saloranta tsalora...@gmail.com wrote:
Now with TimeUUIDType, if two UUID have the same timestamps, they are ordered
by bytes order.
Naively for the whole UUID? That would not be good, given that
timestamp within UUID is not stored in expected lexical
In Python:
keyspace.columnfamily[key][column] = value
files.video[uuid.uuid4()]['name'] = 'foo.flv'
files.video[uuid.uuid4()]['path'] = '/var/files/foo.flv'
create a mapping
files.video = {
uuid.uuid4() : {
'name' : 'foo.flv',
'path' : '/var/files/foo.flv',
}
}
if most
i do some INSERT ,because i will do some scan operations, i use the
OrderPreservingPartition method.
the state of the cluster is showed below.
as i predicated the load is very imbalance, and some of the nodes down (in
some nodes,the Cassandra processes died and in others the processes are
alive
Yes.
Cassandra does save raw string data only, not a file, and shouldn't save a
file.
2010/4/26 刘兵兵 rucb...@gmail.com
sorry i'm not very familiar with python, are you meaning that the files are
stored in the file system of the os?
then , the cassandra just stores the path to access the
Cassandra stores byte arrays. You can certainly store file data in
it, although if it is larger than a few MB you should chunk it into
multiple columns.
On Sun, Apr 25, 2010 at 8:21 PM, Shuge Lee shuge@gmail.com wrote:
Yes.
Cassandra does save raw string data only, not a file, and
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