Hi,
thanks for your feedback!
Just a follow up question;
According to the TableDescriptor
{NAME => 'test3', Coprocessor$2 => '/Users/hbase/CP.jar:Coprocessor.PreGet:12',
Coprocessor$1 => '/Users/hbase/CP.jar:Coprocessor.PrePut:10',
FAMILIES => [{NAME => 'cf', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0',
COMPRESSION => 'NONE', VERSIONS => '3', TTL => '2147483647', BLOCKSIZE =>
'65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}]}
the coprocessors is specified, but actually neither of them is executed when
executing a put; So I am not sure whether they are actually loaded (what
happens if if jar file is not found? -> this should trigger at least a warning).
Any ideas/pointers why this fails (HBAse Version 0.91.0-SNAPSHOT, r1065918)?
package Coprocessor;
public class PrePut extends BaseRegionObserverCoprocessor {
@Override
public void prePut( RegionCoprocessorEnvironment e, Map<byte[],
List<KeyValue>> familyMap, boolean writeToWAL) throws IOException {
//bypass normal system call
e.bypass();
}
}
Thanks again!
JS
-----Ursprüngliche Nachricht-----
Von: "Andrew Purtell" <[email protected]>
Gesendet: 07.02.2011 23:42:35
An: [email protected]
Betreff: Re: Loaded Coprocessor
> is there any way to check which Coprocessors Classes are
> currently loaded? Preferebly using the shell...
Not yet. Good idea, filed: https://issues.apache.org/jira/browse/HBASE-3512
> And related: Can one dynamically load Coprocessors for a
> running hbase system?
Currently coprocessors are loaded statically via configuration or dynamically
upon table open if there are any table attributes that specify it (attribute
name begins with "Coprocessor"). IIRC the javadoc on the coprocessors package
contains detail on this. In short:
HTableDescriptor htd;
// ...
htd.setValue("Coprocessor$foo",
"hdfs://namenode:port/path/to/coprocessor.jar");
A table descriptor can be updated if such specifications are not made a table
create time. See javadoc for HBaseAdmin.
However there is currently no mechanism for triggering additional loads on
tables already open or loading at arbitrary times. There hasn't been a clearly
articulated need for this yet.
Best regards,
- Andy
Problems worthy of attack prove their worth by hitting back.
- Piet Hein (via Tom White)
--- On Mon, 2/7/11, [email protected] <[email protected]> wrote:
> From: [email protected] <[email protected]>
> Subject: Loaded Coprocessor
> To: [email protected]
> Date: Monday, February 7, 2011, 1:48 AM
> Hi,
> is there any way to check which Coprocessors Classes are
> currently loaded? Preferebly using the shell...
> And related: Can one dynamically load Coprocessors for a
> running hbase system?
>
> Thanks for your support!
> JS
>
