Here you go
http://wiki.apache.org/cassandra/Operations#Dealing_with_the_consequences_of_nodetool_repair_not_running_within_GCGraceSeconds
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 21/12/2011, at 2:44 PM, Blake Starkenburg wrote:
> I
You can slice the "key1" row to get the columns that have "xyz" as the value
for the first component in the column name. Check the docs in your client for
how to do that.
Hope that helps.
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 21/12/2
On Tue, Dec 20, 2011 at 9:33 PM, Maxim Potekhin wrote:
> Thank you Aaron! As long as I have plain strings, would you say that I would
> do almost as well with catenation?
Not without a concatenation aware comparator. The padding aaron is talking of
is not a mixed type problem only. What I mean he
On Wed, Dec 21, 2011 at 7:04 AM, Martin Arrowsmith
wrote:
> Dear Cassandra Experts,
>
> Are the number of composite attributes fixed for each column family ?
>
> I have been doing : "create column family MyCF with comparator =
> 'CompositeType(IntegerType, UTF8Type)'
>
> And this creates a composi
Hi,
I wonder about the best strategy when a cluster sees changes in its
topology relatively often.
My main concern is how to handle the initial token for new nodes. If a
cluster is first created with 7 nodes for which the initial token is
calculated with the formula here:
http://wiki.apache.org/c
Is it true that you can also just get the same results as when you pick a
UTF8 key with this content:
keyA:keyB
Of should you really use the composite keys? If so, what is the big
advantage of composite over combined utf-8 keys?
Robin
2011/12/21 Sylvain Lebresne
> On Tue, Dec 20, 2011 at 9:33
Hello,
I am evaluating the usage of cassandra for my system. I will have several
clients who won't share data with each other. My idea is to create one column
family per client. When a new client comes in and adds data to the system, I'd
like to create a column family dynamically. Is that relia
Hi, I don't know if this will be technically possible, but I just want to
warn you about creating a lot of column families. When you will have a lot
clients, you will have a lot of column families and, if I'm right, each
column family uses memory on every node. You will run out of memory very
fast,
Every node? I hadn't realized that. Is there a place where i can compute
how much memory is being 'wasted' ?
Le 21 déc. 2011 15:09, "Alain RODRIGUEZ" a écrit :
> Hi, I don't know if this will be technically possible, but I just want to
> warn you about creating a lot of column families. When you
Hi,
based on my experience with Cassandra 0.7.4, i strongly discourage you to do that: we tried dynamical creation of column
families, and it was a nightmare.
First of all, the operation can not be done concurrently, therefore you must find a way to avoid parallel creation (over
all the cluster
Thank You!
Could the lack of routine repair be why nodetool ring reports: node(1) Load
-> 78.24 MB and node(2) Load -> 67.21 MB? The load span between the two
nodes has been increasing ever so slowly...
On Wed, Dec 21, 2011 at 1:00 AM, aaron morton wrote:
> Here you go
> http://wiki.apache.org/c
On Tue, Dec 20, 2011 at 1:49 PM, Feng Qu wrote:
> I have two questions for community version of opscenter
>
> 1) does it work with multiple cassandra cluster?
Tyler answered the second part. As for managing multiple clusters from
a single opscenter: not yet, but it's on our radar.
--
Jonathan E
What we have done to avoid creating multiple column families is to sort of
namespace the row key. So if we have a column family of Users and
accounts: "AccountA" and "AccountB", we do the following:
Column Family User:
"AccountA/ryan" : { first: Ryan, last: Lowe }
"AccountB/ryan" : { first:
The overhead for column families was greatly reduced in 0.8 and 1.0.
It should now be possible to have hundreds or thousands of column
families. The setting 'memtable_total_space_in_mb' was introduced that
allows for a global memtable threshold, and cassandra will handle
flushing on its own.
See
How many rows are you asking for in the multget_slice and what thread pools are
showing pending tasks ?
Also, what happens when you reduce the number of rows in the request?
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 21/12/2011, at 11
AFAIK there are no plans kill the BOP, but I would still try to make your life
easier by using the RP. .
My understanding of the problem is at certain times you snapshot the files in a
dir; and the main query you want to handle is "At what points between time t0
and time t1 did files x,y and z
How often is "relatively often" ?
> * having a fixed amount of nodes with initial tokens and letting new
> ones auto bootstrap themselves
Generally a bad idea, you should make sure nodes re given sensible tokens that
evenly distribute the data.
Cheers
-
Aaron Morton
Freelan
Keys are sorted by their token, when using the RandomPartitioner this is a MD5
hash. So they are essentially randomly sorted.
I would use CompositeTypes as keys if they make sense for your app. e.g. you
are storing time series data and the row key is the time stamp and the length
of the time
Post the output from nodetool ring and take a look at
http://wiki.apache.org/cassandra/Operations#Token_selection
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 22/12/2011, at 5:21 AM, Blake Starkenburg wrote:
> Thank You!
>
> Could the
Hi Aaron,
>How many rows are you asking for in the multget_slice and what thread
pools are showing pending tasks ?
I am querying in batches of 256 keys max. Each batch may slice between 1
and 5 explicit super columns (I need all the columns in each super column,
there are at the very most a couple
along the same line of the last experimient I did (cluster is only being
updated by a single threaded batching processing.)
All nodes are the same hardware & configuration. Why on earth would one
node require disk IO and not the 2 replicas ?
Primary replica show some disk activity (iostat shows ab
A couple of nodes per month, but with peaks.
I will test the nodetool move based scenario then.
Cheers,
- pyr
On Wed, Dec 21, 2011 at 10:10 PM, aaron morton wrote:
> How often is "relatively often" ?
>
> * having a fixed amount of nodes with initial tokens and letting new
> ones auto bootstr
Output from nodetool ring:
Address DC RackStatus State Load
OwnsToken
85070591730234615865843651857942052864
110.82.155.2 datacenter1 rack1 Up Normal 78.23 MB
50.00% 0
110.82.155.4 datacenter1 rack1 Up Normal 67.21 MB
50.00% 8507059173023
I've got some nodes in a "moving" state in a cluster (the nodes to which
they stream shouldn't overlap), and I'm finding it difficult to determine
if they're actually doing anything related to the move at this point, or if
they're stuck in the state and not actually doing anything.
In each case, I
> Could the lack of routine repair be why nodetool ring reports: node(1) Load
> -> 78.24 MB and node(2) Load -> 67.21 MB? The load span between the two
> nodes has been increasing ever so slowly...
No.
Generally there will be a variation in load depending on what state
compaction happens to be in
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