On Thu, Apr 26, 2012 at 10:38 PM, Shubham Srivastava
wrote:
> On another thought I could also try copying the data of my keyspace alone
> from one node to another node in the new cluster (I have both the old and new
> clusters having same nodes DC1:6,DC2:6 with same tokens) with the same tokens.
Thanks a lot Rob.
On another thought I could also try copying the data of my keyspace alone from
one node to another node in the new cluster (I have both the old and new
clusters having same nodes DC1:6,DC2:6 with same tokens) with the same tokens.
Would there be any risk of the new cluster ge
That is one of the perks of brisk and later datastax enterprise. As it
stands the datanode component is only used as a distributed cache for
jars. So if your job uses cassandra for input format and output format
you only need the other components for temporary storage.
On Thu, Apr 26, 2012 at 7:12
Hello to all!
It it possible to launch only hadoop mapreduce task tracker and job tracker
against cassandra cluster, and doesn't launch HDFS (use for shared storage
something else)??
Thanks
This is the second node I've joined to my cluster in the last few days, and so
far both have become stuck at 100% on a large file according to netstats. This
is on 1.0.9, is there anything I can do to make it move on besides restarting
Cassandra? I don't see any errors or warns in logs for eit
DML example,
insert into user_score_v3(name, highscore, x,y,z)
values ('abc', 299.76, 1001, '*', '*');
...
2012/4/26 Data Craftsman :
> Data model:
>
> REM CQL 3.0
>
>
> $> cqlsh --cql3
>
> drop COLUMNFAMILY user_score_v3;
>
> CREATE COLUMNFAMILY user_score_v3
> (name varchar,
> highscore
Data model:
REM CQL 3.0
$> cqlsh --cql3
drop COLUMNFAMILY user_score_v3;
CREATE COLUMNFAMILY user_score_v3
(name varchar,
highscore float,
x int,
y varchar,
z varchar,
PRIMARY KEY (name, highscore)
);
DML is as usual, as commom, as RDBMS SQL.
Query:
Top 3,
SELECT name, highscore,
Hello,
I am new to cassandra and was hoping if someone can tell me if the
following is possible.
Given I have a columnfamily with a list of users in each Row.
Each user has the properties: name, highscore, x, y, z.
I want to use name as the column key, but I want the columns to be sorted
by hi
I am having the same issue in 1.0.7 with leveled compation. It seems that
the repair is flaky. It either completes relatively fast in a TEST
environment (7 minutes) or gets stuck trying to receive a merkle tree from
a peer that is already sending it the merkle tree.
Only solution is to restart c
I am having the same issue in 1.0.7 with leveled compation. It seems that
the repair is flaky. It either completes relatively fast in a TEST
environment (7 minutes) or gets stuck trying to receive a merkle tree from
a peer that is already sending it the merkle tree.
Only solution is to restart c
> I copied all the snapshots from each individual nodes where the snapshot
> data size was around 12Gb on each node to a common folder(one folder alone).
>
> Strangely I found duplicate file names in multiple snapshots and
> more strangely the data size was different of each duplicate file which le
I was trying to get hold of all the data kind of a global snapshot.
I did the below :
I copied all the snapshots from each individual nodes where the snapshot data
size was around 12Gb on each node to a common folder(one folder alone).
Strangely I found duplicate file names in multiple snapshot
Hi everyone !
I'm fairly new to cassandra and I'm not quite yet familiarized with column
oriented NoSQL model.
I have worked a while on it, but I can't seems to find the best model for what
I'm looking for.
I have a Erlang software that let user connecting and communicate with each
others, whe
My cluster is very small (300 MB) and compact was taking more than 2 hours.
I ended up bouncing all the nodes. After that, I was able to run repair
on all nodes, and each one takes less than a minute.
If this happens again I will be sure to run compactionstats and netstats.
Thanks for that tip.
Hi All,
I am using property of columns i.e., they are in sorted order to store sort
orders (I believe everyone else is also using the same).
But if I want to maintain sort order on a property, whose value changes, I
would have to perform read and delete operation. Is there a better way to
solve th
Exactly, but why would reads be significantly slower over time when
including just one more, although sometimes large, SSTable in the read?
Ji Cheng skrev 2012-04-26 11:11:
I'm also quite interested in this question. Here's my understanding on
this problem.
1. If your workload is append-only,
I'm also quite interested in this question. Here's my understanding on this
problem.
1. If your workload is append-only, doing a major compaction shouldn't
affect the read performance too much, because each row appears in one
sstable anyway.
2. If your workload is mostly updating existing rows, t
In the tuning documentation regarding Cassandra, it's recomended not to
run major compactions.
I understand what a major compaction is all about but I'd like an in
depth explanation as to why reads "will continually degrade until the
next major compaction is manually invoked".
From the doc:
"S
Your second part was what I was also referring where I put all the files from
nodes to a single node to create a similar bkp which needs to have unique file
names across cluster.
From: Deno Vichas [mailto:d...@syncopated.net]
Sent: Thursday, April 26, 2012 12:29 PM
To: user@cassandra.apache.org
there's no prerequisite for unique names. each node's snapshot gets
tar'ed up and then copied over to a directory the name of the hostname
of the node. then those dirs are tar'ed and copied to S3.
what i haven't tried yet is to untar everything for all nodes into a
single node cluster. i'm
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