Thanks Michael. I attached the reply I got back from CDH4 user group from
Harsh. Hope to share the experience.
"
In CDH4, the MR1 and MR2 APIs are both fully compatible (such that
moving to YARN in future would require no recompilation from MR1
produced jars). You can consider it "2.0" API in binar
Here is the deal.
http://wiki.apache.org/hadoop/Defining%20Hadoop
INAPPROPRIATE: Automotive Joe's Crankshaft: 100% compatible with Hadoop
Bad, because "100% compatible" is a meaningless statement. Even Apache
releases have regressions; cases were versions are incompatible *even
when the Java int
No one had ever tried vnodes with hadoop until the OP did, or they
would have noticed this. No one extensively used it with secondary
indexes either from the last ticket I mentioned.
My mistake they are not a default.
I do think vnodes are awesome, its great that c* has the longer
release cylcle.
On Sat, Feb 16, 2013 at 9:13 AM, Edward Capriolo wrote:
> No one had ever tried vnodes with hadoop until the OP did, or they
> would have noticed this. No one extensively used it with secondary
> indexes either from the last ticket I mentioned.
>
> My mistake they are not a default.
>
> I do think
Fwiw - here is are some changes that a friend said should make C*'s Hadoop
support work with CDH4 - for ColumnFamilyRecordReader.
https://gist.github.com/jeromatron/4967799
On Feb 16, 2013, at 8:23 AM, Edward Capriolo wrote:
> Here is the deal.
>
> http://wiki.apache.org/hadoop/Defining%20Hado
Another piece of information that would be useful is advice on how to
properly set the SSTable size for your usecase. I understand the
default is 5MB, a lot of examples show the use of 10MB, and I've seen
cases where people have set is as high as 200MB.
Any information is appreciated,
-Mike
That sounds like something wrong with the way the rows are merged during
compaction then.
Can you run the compaction with DEBUG logging and raise a ticket? You may want
to do this with the node not in the ring. Five minutes after it starts it will
run pending compactions, so if there if compac
> Is that a feature that could possibly be developed one day ?
No.
Timestamps are essentially internal implementation used to resolve different
values for the same column.
> With "min_compaction_level_threshold" did you mean "min_compaction_threshold"
> ? If so, why should I do that, what ar
"Can you point to the docs."
http://www.datastax.com/docs/1.1/configuration/storage_configuration#max-compaction-threshold
And thanks about the rest of your answers, once again ;-).
Alain
2013/2/16 aaron morton
> Is that a feature that could possibly be developed one day ?
>
> No.
> Timesta
Like articles with tests and conclusions about it, and such, and not like the
documentation in DataStax, or the Cassandra Books.
Thank you.
Asking the question three times will not help getting it answered
faster. Furthermore, I believe no one has answered it because no one
understands what your asking.
Here is something with tests and conclusions and it is not written by
datastax or part of a book on cassandra.
http://pbs.cs.berkele
I'm sorry, it's because the mail is returning to me, and I thought it wasn't
working. That link is similar to what I asked. I'm searching like, for
example, PhD,Dr,Ms dissertationsabout those topics in Cassandra; articles like
http://www.cs.cornell.edu/projects/ladis2009/papers/lakshman-ladis2
Wouldn't you have more than 256 splits anyway, given a normal amount of data?
(Default split size is 64k rows.)
On Fri, Feb 15, 2013 at 7:01 PM, Edward Capriolo wrote:
> Seems like the hadoop Input format should combine the splits that are
> on the same node into the same map task, like Hadoop's
Split size does not have to equal block size.
http://hadoop.apache.org/docs/r1.1.1/api/org/apache/hadoop/mapred/lib/CombineFileInputFormat.html
An abstract InputFormat that returns CombineFileSplit's in
InputFormat.getSplits(JobConf, int) method. Splits are constructed
from the files under the in
Hi All,
I am newbie to Cassandra and trying to run an example program
"ClientOnlyExample" taken from
https://raw.github.com/apache/cassandra/cassandra-1.2/examples/client_only/src/ClientOnlyExample.java.
But while executing the program it gives me a null pointer exception. Can you
guys pleas
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