Warmup API

Elastic Stack Elasticsearch
1

Hi,

two short questions about warmup API:

First, issue #1913 mentions a get warmer method. I couldnt find anything
like this in the java api, can someone point me to some code or give me
some buzzwords to look at in the javadoc?
And second, how does warming up interfer with optimization? Is warming up
also triggered when segments are merged? Can I manually trigger warmup
method by calling refresh on an index?

Thanks a lot!
Andrej

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2

You can find some examples of handling warmers in the integration tests:
https://github.com/elasticsearch/elasticsearch/tree/master/src/test/java/org/elasticsearch/test/integration/indices/wamer

Warmers are triggered by creation of new segments, so refresh and optimize
will most likely trigger warmers. Manually calling refresh will trigger
warmup only if it will result in new segment creation. If you will call
refresh over and over again without actually indexing anything, warmer will
not be triggered.

If you don't want warmers to interfere with optimization, you can temporary
disable warmers by setting index.warmer.enabled to false in the index
settings.

To get a better idea when warmers are running on your particular indices
and queries set indices.warmer to the TRACE level in the logging.yml file.
It will cause elasticsearch to print a message in the log file every time
warmer is triggered.

On Tuesday, January 8, 2013 12:52:33 PM UTC-5, Andrej Rosenheinrich wrote:

Hi,

two short questions about warmup API:

First, issue #1913 mentions a get warmer method. I couldnt find anything
like this in the java api, can someone point me to some code or give me
some buzzwords to look at in the javadoc?
And second, how does warming up interfer with optimization? Is warming up
also triggered when segments are merged? Can I manually trigger warmup
method by calling refresh on an index?

Thanks a lot!
Andrej

--

3

Igor, thanks for your explanations and pointing to the tests, that helped
me a lot! What I am trying to do is to actually check if warmer are
registered on an index, so I can retrieve them and use this information
when copying an index (basicly as part of a clone like method). As a
suggestion, maybe it would be handy to add something like a
getWarmerSearchRequests method to the Warmup API, reading byte arrays from
Metadata and creating new search requests by hand all the time is not so
comfortable :wink:

Thanks again!
Andrej

Am Mittwoch, 9. Januar 2013 01:25:20 UTC+1 schrieb Igor Motov:

You can find some examples of handling warmers in the integration tests:
https://github.com/elasticsearch/elasticsearch/tree/master/src/test/java/org/elasticsearch/test/integration/indices/wamer

Warmers are triggered by creation of new segments, so refresh and optimize
will most likely trigger warmers. Manually calling refresh will trigger
warmup only if it will result in new segment creation. If you will call
refresh over and over again without actually indexing anything, warmer will
not be triggered.

If you don't want warmers to interfere with optimization, you can
temporary disable warmers by setting index.warmer.enabled to false in the
index settings.

To get a better idea when warmers are running on your particular indices
and queries set indices.warmer to the TRACE level in the logging.yml file.
It will cause elasticsearch to print a message in the log file every time
warmer is triggered.

On Tuesday, January 8, 2013 12:52:33 PM UTC-5, Andrej Rosenheinrich wrote:

Hi,

two short questions about warmup API:

First, issue #1913 mentions a get warmer method. I couldnt find anything
like this in the java api, can someone point me to some code or give me
some buzzwords to look at in the javadoc?
And second, how does warming up interfer with optimization? Is warming up
also triggered when segments are merged? Can I manually trigger warmup
method by calling refresh on an index?

Thanks a lot!
Andrej

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