Writing a custom scoring plugin


(Srinivasan Ramaswamy) #1

I am trying to write a custom scoring plugin that will let me provide some
extra data that is not in the index (through an external service) and do
customized ranking. I would ideally like to custom score all the documents
in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra data
from my external service. Is there a better way ? When and how the plugin
services will be called. I would like to know in detail about the entry
points of plugins and how i should write this plugin. Any help or pointers
would be appreciated.

Thanks
Srini

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(vineeth mohan-2) #2

Hello Srinivasan ,

You cna easily create this as a plugin.
There are many examples here -

Thanks
Vineeth

On Tue, Sep 2, 2014 at 10:18 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

I am trying to write a custom scoring plugin that will let me provide some
extra data that is not in the index (through an external service) and do
customized ranking. I would ideally like to custom score all the documents
in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra data
from my external service. Is there a better way ? When and how the plugin
services will be called. I would like to know in detail about the entry
points of plugins and how i should write this plugin. Any help or pointers
would be appreciated.

Thanks
Srini

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(Jörg Prante) #3

You can write a function score plugin.

Here is an example:

Jörg

On Tue, Sep 2, 2014 at 6:48 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

I am trying to write a custom scoring plugin that will let me provide some
extra data that is not in the index (through an external service) and do
customized ranking. I would ideally like to custom score all the documents
in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra data
from my external service. Is there a better way ? When and how the plugin
services will be called. I would like to know in detail about the entry
points of plugins and how i should write this plugin. Any help or pointers
would be appreciated.

Thanks
Srini

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(Srinivasan Ramaswamy) #4

Thanks Vineeth. I stumbled upon that example too, thats one of the best
resources I have found so far.

Thanks Joerg, this example looks very interesting to me. I see that you are
sending in the extra parameters with the query, but i would like the plugin
to read the data from external source and not during scoring time (in a
seperate background thread periodically). I have data for every document
but organized in a multilayered structure. Thats one of the reason I
couldnt put it in the document index and retrieve it efficiently during
scoring. Now I am planning to put it in a in-memory data structure which is
available for the plugin to use. Do you have any thoughts/recommendation on
that ?

Thanks
Srini

On Tue, Sep 2, 2014 at 10:16 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You can write a function score plugin.

Here is an example:

https://github.com/jprante/elasticsearch-functionscore-conditionalboost

Jörg

On Tue, Sep 2, 2014 at 6:48 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

I am trying to write a custom scoring plugin that will let me provide
some extra data that is not in the index (through an external service) and
do customized ranking. I would ideally like to custom score all the
documents in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra data
from my external service. Is there a better way ? When and how the plugin
services will be called. I would like to know in detail about the entry
points of plugins and how i should write this plugin. Any help or pointers
would be appreciated.

Thanks
Srini

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(Jörg Prante) #5

Not sure if you looked at the source code of the function score weighted
boost plugin. The plugin uses query-time parameterization but it is of
course very easy to modify this and use settings at ES node startup time
for function score boosting, or a refresh mechanism that fetches parameters
from wherever you like.

Jörg

On Tue, Sep 2, 2014 at 8:09 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

Thanks Vineeth. I stumbled upon that example too, thats one of the best
resources I have found so far.

Thanks Joerg, this example looks very interesting to me. I see that you
are sending in the extra parameters with the query, but i would like the
plugin to read the data from external source and not during scoring time
(in a seperate background thread periodically). I have data for every
document but organized in a multilayered structure. Thats one of the reason
I couldnt put it in the document index and retrieve it efficiently during
scoring. Now I am planning to put it in a in-memory data structure which is
available for the plugin to use. Do you have any thoughts/recommendation on
that ?

Thanks
Srini

On Tue, Sep 2, 2014 at 10:16 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You can write a function score plugin.

Here is an example:

https://github.com/jprante/elasticsearch-functionscore-conditionalboost

Jörg

On Tue, Sep 2, 2014 at 6:48 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

I am trying to write a custom scoring plugin that will let me provide
some extra data that is not in the index (through an external service) and
do customized ranking. I would ideally like to custom score all the
documents in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra data
from my external service. Is there a better way ? When and how the plugin
services will be called. I would like to know in detail about the entry
points of plugins and how i should write this plugin. Any help or pointers
would be appreciated.

Thanks
Srini

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(Srinivasan Ramaswamy) #6

Hi Joerg,

I tried the data loading part as a separate module and it works, but i have
a small issue with it. When there is an exception the constructor gets
called multiple times.

public class CustomDataModule extends AbstractModule {
private final Settings settings;

public SalesDataModule(Settings settings){
    this.settings = settings;
}

@Override
protected void configure() {
    bind(CustomData.class).asEagerSingleton();
}

}

public final class CustomData {
private static Logger logger = LoggerFactory.getLogger(CustomData.class);
@Inject
public CustomData(Settings settings) {
logger.info("CustomData constructor called");
WebResource webResource = getDataServiceResource(settings);
response = getSalesDataFromDataService(webResource);
loadCustomDataIntoMemory(response);
}
}

when the external service (which is the source of data) is down or there is
some other issue, the CustomData constructor gets called repeatedly (approx
400 times). When there is no exception it gets called only once. I am
trying to understand why its called multiple times when there is an
exception.

I took a look at your code sample and I am trying to understand the purpose
of the Build class and who calls it ?

Can you also elaborate on your thoughts about reloading this customData
periodically. Currently I am thinking of using LoadingCache to store the
data and refresh it by using the refresh mechanism.

Thanks
Srini

On Tue, Sep 2, 2014 at 2:01 PM, joergprante@gmail.com <joergprante@gmail.com

wrote:

Not sure if you looked at the source code of the function score weighted
boost plugin. The plugin uses query-time parameterization but it is of
course very easy to modify this and use settings at ES node startup time
for function score boosting, or a refresh mechanism that fetches parameters
from wherever you like.

Jörg

On Tue, Sep 2, 2014 at 8:09 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

Thanks Vineeth. I stumbled upon that example too, thats one of the best
resources I have found so far.

Thanks Joerg, this example looks very interesting to me. I see that you
are sending in the extra parameters with the query, but i would like the
plugin to read the data from external source and not during scoring time
(in a seperate background thread periodically). I have data for every
document but organized in a multilayered structure. Thats one of the reason
I couldnt put it in the document index and retrieve it efficiently during
scoring. Now I am planning to put it in a in-memory data structure which is
available for the plugin to use. Do you have any thoughts/recommendation on
that ?

Thanks
Srini

On Tue, Sep 2, 2014 at 10:16 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You can write a function score plugin.

Here is an example:

https://github.com/jprante/elasticsearch-functionscore-conditionalboost

Jörg

On Tue, Sep 2, 2014 at 6:48 PM, Srinivasan Ramaswamy <ursvasan@gmail.com

wrote:

I am trying to write a custom scoring plugin that will let me provide
some extra data that is not in the index (through an external service) and
do customized ranking. I would ideally like to custom score all the
documents in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra
data from my external service. Is there a better way ? When and how the
plugin services will be called. I would like to know in detail about the
entry points of plugins and how i should write this plugin. Any help or
pointers would be appreciated.

Thanks
Srini

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(Jörg Prante) #7

You must handle exceptions very carefully in plugins. You should log errors
to the log, skip/disable the plugin operation, and that's it.

Jörg

On Fri, Sep 5, 2014 at 3:14 AM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

Hi Joerg,

I tried the data loading part as a separate module and it works, but i
have a small issue with it. When there is an exception the constructor gets
called multiple times.

public class CustomDataModule extends AbstractModule {
private final Settings settings;

public SalesDataModule(Settings settings){
    this.settings = settings;
}

@Override
protected void configure() {
    bind(CustomData.class).asEagerSingleton();
}

}

public final class CustomData {
private static Logger logger = LoggerFactory.getLogger(CustomData.class);
@Inject
public CustomData(Settings settings) {
logger.info("CustomData constructor called");
WebResource webResource = getDataServiceResource(settings);
response = getSalesDataFromDataService(webResource);
loadCustomDataIntoMemory(response);
}
}

when the external service (which is the source of data) is down or there
is some other issue, the CustomData constructor gets called repeatedly
(approx 400 times). When there is no exception it gets called only once. I
am trying to understand why its called multiple times when there is an
exception.

I took a look at your code sample and I am trying to understand the
purpose of the Build class and who calls it ?

Can you also elaborate on your thoughts about reloading this customData
periodically. Currently I am thinking of using LoadingCache to store the
data and refresh it by using the refresh mechanism.

Thanks
Srini

On Tue, Sep 2, 2014 at 2:01 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Not sure if you looked at the source code of the function score weighted
boost plugin. The plugin uses query-time parameterization but it is of
course very easy to modify this and use settings at ES node startup time
for function score boosting, or a refresh mechanism that fetches parameters
from wherever you like.

Jörg

On Tue, Sep 2, 2014 at 8:09 PM, Srinivasan Ramaswamy ursvasan@gmail.com
wrote:

Thanks Vineeth. I stumbled upon that example too, thats one of the best
resources I have found so far.

Thanks Joerg, this example looks very interesting to me. I see that you
are sending in the extra parameters with the query, but i would like the
plugin to read the data from external source and not during scoring time
(in a seperate background thread periodically). I have data for every
document but organized in a multilayered structure. Thats one of the reason
I couldnt put it in the document index and retrieve it efficiently during
scoring. Now I am planning to put it in a in-memory data structure which is
available for the plugin to use. Do you have any thoughts/recommendation on
that ?

Thanks
Srini

On Tue, Sep 2, 2014 at 10:16 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You can write a function score plugin.

Here is an example:

https://github.com/jprante/elasticsearch-functionscore-conditionalboost

Jörg

On Tue, Sep 2, 2014 at 6:48 PM, Srinivasan Ramaswamy <
ursvasan@gmail.com> wrote:

I am trying to write a custom scoring plugin that will let me provide
some extra data that is not in the index (through an external service) and
do customized ranking. I would ideally like to custom score all the
documents in the index that match the query.

Currently I am planning to implement it as a service by extending
AbstractLifecycleComponent which will periodically pull that extra
data from my external service. Is there a better way ? When and how the
plugin services will be called. I would like to know in detail about the
entry points of plugins and how i should write this plugin. Any help or
pointers would be appreciated.

Thanks
Srini

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(Moises Acuna) #8

Hi, i know it's been a few years since the last reply. I'm building something similar as this, a custom scoring function that relies on external data ( doc_id , score map) coming from a rest endpoint. I've setup the function score and the service but i found now way for the function score code to access the data structre from the service module.
Thanks for any help.


(system) #9