High count of threadpools getting created

John_D_Ament · August 1, 2014, 4:38pm

Hi all

Based on another thread I started, I'm embedding ES into my application.
Starting today, and I'm sure there's something that got thrown into the
mix causing this, we have started seeing high counts of thread pools
getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool] (ServerService
Thread Pool -- 19) [Sauron] creating thread_pool [generic], type [cached],
keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool] (ServerService
Thread Pool -- 19) [Sauron] creating thread_pool [generic], type [cached],
keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this expected?

John

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jprante · August 2, 2014, 2:43pm

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is not
possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my application.
Starting today, and I'm sure there's something that got thrown into the
mix causing this, we have started seeing high counts of thread pools
getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this expected?

John

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John_D_Ament · August 2, 2014, 2:52pm

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly to
deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how to
deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is not
possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my application.
Starting today, and I'm sure there's something that got thrown into the
mix causing this, we have started seeing high counts of thread pools
getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this expected?

John

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jprante · August 2, 2014, 3:02pm

You surely had a look at the official support for ES in a servlet?

github.com

elastic/elasticsearch-transport-wares/blob/master/src/main/java/org/elasticsearch/wares/NodeServlet.java

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.wares;

This file has been truncated. show original

Does this approach match your setup?

I do not really prefer this approach, instead, I use a TransportClient in a
ServletContextListener, so I have a shared client instance across servlets
that I can safely start and stop when Wildfly starts and stops.

Can you clarify what are the Lucuene 4.9 quirks?

Jörg

On Sat, Aug 2, 2014 at 4:52 PM, John D. Ament john.d.ament@gmail.com
wrote:

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly to
deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how to
deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is not
possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my application.
Starting today, and I'm sure there's something that got thrown into the
mix causing this, we have started seeing high counts of thread pools
getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this expected?

John

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John_D_Ament · August 2, 2014, 3:07pm

Jorg,

I've looked at that before. While my app has a set of REST endpoints, we
don't really deploy anything as servlets. Everything we do is either EJB
or CDI endpoints, so trying to configure a servlet is a pain. I ended up
just building a @Singleton @Startup to boot ES by reading in
elasticsearch.yml from some config location (default = jboss's config
directory). This client is stored in an @ApplicationScoped bean and made
available throughout the ES query module I put together.

The quirks are more about how we're deploying. instead of dropping 3rd
party libs into our war, we drop them into the modules folder of WildFly
and read them that way. There are certain aspects of classloader
segregation that this raises. Specifically, I think there was an ordering
issue between lucene and ES which causes some scoping conflicts. This was
fixed by simply putting the two of them together into a single module. Not
ideal, but it got the job done.

John

On Sat, Aug 2, 2014 at 11:02 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You surely had a look at the official support for ES in a servlet?

https://github.com/elasticsearch/elasticsearch-transport-wares/blob/master/src/main/java/org/elasticsearch/wares/NodeServlet.java

Does this approach match your setup?

I do not really prefer this approach, instead, I use a TransportClient in
a ServletContextListener, so I have a shared client instance across
servlets that I can safely start and stop when Wildfly starts and stops.

Can you clarify what are the Lucuene 4.9 quirks?

Jörg

On Sat, Aug 2, 2014 at 4:52 PM, John D. Ament john.d.ament@gmail.com
wrote:

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly to
deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how to
deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is
not possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my
application. Starting today, and I'm sure there's something that got
thrown into the mix causing this, we have started seeing high counts of
thread pools getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this expected?

John

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jprante · August 2, 2014, 3:41pm

Yes, because Elasticsearch is patching/overriding some dependencies by
simply reimplementing some classes, the elasticsearch jar must precede at
least Lucene and Joda jars in the classpath.

All that I have left as a hint to avoid the sudden thread pool inits is to
examine the code if there are unwanted class instantiations instead of
singletons, but I'm sure you are aware of that.

@ApplicationScoped beans are tricky because they are initialized lazily and
are not really singletons in some situations. In short words I'm glad I
could leave all those EJB annoyances behind and rely on JSR 330 (Guice
style).

Jörg

On Sat, Aug 2, 2014 at 5:07 PM, John D. Ament john.d.ament@gmail.com
wrote:

Jorg,

I've looked at that before. While my app has a set of REST endpoints, we
don't really deploy anything as servlets. Everything we do is either EJB
or CDI endpoints, so trying to configure a servlet is a pain. I ended up
just building a @Singleton @Startup to boot ES by reading in
elasticsearch.yml from some config location (default = jboss's config
directory). This client is stored in an @ApplicationScoped bean and made
available throughout the ES query module I put together.

The quirks are more about how we're deploying. instead of dropping 3rd
party libs into our war, we drop them into the modules folder of WildFly
and read them that way. There are certain aspects of classloader
segregation that this raises. Specifically, I think there was an ordering
issue between lucene and ES which causes some scoping conflicts. This was
fixed by simply putting the two of them together into a single module. Not
ideal, but it got the job done.

John

On Sat, Aug 2, 2014 at 11:02 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You surely had a look at the official support for ES in a servlet?

https://github.com/elasticsearch/elasticsearch-transport-wares/blob/master/src/main/java/org/elasticsearch/wares/NodeServlet.java

Does this approach match your setup?

I do not really prefer this approach, instead, I use a TransportClient in
a ServletContextListener, so I have a shared client instance across
servlets that I can safely start and stop when Wildfly starts and stops.

Can you clarify what are the Lucuene 4.9 quirks?

Jörg

On Sat, Aug 2, 2014 at 4:52 PM, John D. Ament john.d.ament@gmail.com
wrote:

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly
to deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how
to deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is
not possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my
application. Starting today, and I'm sure there's something that got
thrown into the mix causing this, we have started seeing high counts of
thread pools getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this
expected?

John

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John_D_Ament · August 2, 2014, 4:04pm

Jorg,

Sorry, I may not have been clear. At this point, all of the classpath
issues are resolved. I was wondering if you guys would be interested in a
documentation patch where I can go over how I did this configuration, in
case anyone else wants to try this with their JBoss/WildFly instances.

As I mentioned, I'm doing the initialization via a @Singleton @Startup.
This is enforcing that the app scoped client is remaining one instance for
the entire app. In fact I had a guy yesterday turn that off "because it's
not needed"... needless to say nothing worked. I wish CDI provided a
startup event, but almost there.

John

On Sat, Aug 2, 2014 at 11:41 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Yes, because Elasticsearch is patching/overriding some dependencies by
simply reimplementing some classes, the elasticsearch jar must precede at
least Lucene and Joda jars in the classpath.

All that I have left as a hint to avoid the sudden thread pool inits is
to examine the code if there are unwanted class instantiations instead of
singletons, but I'm sure you are aware of that.

@ApplicationScoped beans are tricky because they are initialized lazily
and are not really singletons in some situations. In short words I'm glad I
could leave all those EJB annoyances behind and rely on JSR 330 (Guice
style).

Jörg

On Sat, Aug 2, 2014 at 5:07 PM, John D. Ament john.d.ament@gmail.com
wrote:

Jorg,

I've looked at that before. While my app has a set of REST endpoints, we
don't really deploy anything as servlets. Everything we do is either EJB
or CDI endpoints, so trying to configure a servlet is a pain. I ended up
just building a @Singleton @Startup to boot ES by reading in
elasticsearch.yml from some config location (default = jboss's config
directory). This client is stored in an @ApplicationScoped bean and made
available throughout the ES query module I put together.

The quirks are more about how we're deploying. instead of dropping 3rd
party libs into our war, we drop them into the modules folder of WildFly
and read them that way. There are certain aspects of classloader
segregation that this raises. Specifically, I think there was an ordering
issue between lucene and ES which causes some scoping conflicts. This was
fixed by simply putting the two of them together into a single module. Not
ideal, but it got the job done.

John

On Sat, Aug 2, 2014 at 11:02 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You surely had a look at the official support for ES in a servlet?

https://github.com/elasticsearch/elasticsearch-transport-wares/blob/master/src/main/java/org/elasticsearch/wares/NodeServlet.java

Does this approach match your setup?

I do not really prefer this approach, instead, I use a TransportClient
in a ServletContextListener, so I have a shared client instance across
servlets that I can safely start and stop when Wildfly starts and stops.

Can you clarify what are the Lucuene 4.9 quirks?

Jörg

On Sat, Aug 2, 2014 at 4:52 PM, John D. Ament john.d.ament@gmail.com
wrote:

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly
to deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how
to deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is
not possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament john.d.ament@gmail.com
wrote:

Hi all

Based on another thread I started, I'm embedding ES into my
application. Starting today, and I'm sure there's something that got
thrown into the mix causing this, we have started seeing high counts of
thread pools getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this
expected?

John

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jprante · August 2, 2014, 5:58pm

A posting of how you get it to work and what pitfalls you encountered would
be awesome!

Not sure how to get this into official Elasticsearch docs, but I'm
confident the ES team would welcome anything, a pull request, or a pointer
to a blog...

Jörg

On Sat, Aug 2, 2014 at 6:04 PM, John D. Ament john.d.ament@gmail.com
wrote:

Jorg,

Sorry, I may not have been clear. At this point, all of the classpath
issues are resolved. I was wondering if you guys would be interested in a
documentation patch where I can go over how I did this configuration, in
case anyone else wants to try this with their JBoss/WildFly instances.

As I mentioned, I'm doing the initialization via a @Singleton @Startup.
This is enforcing that the app scoped client is remaining one instance for
the entire app. In fact I had a guy yesterday turn that off "because it's
not needed"... needless to say nothing worked. I wish CDI provided a
startup event, but almost there.

John

On Sat, Aug 2, 2014 at 11:41 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Yes, because Elasticsearch is patching/overriding some dependencies by
simply reimplementing some classes, the elasticsearch jar must precede at
least Lucene and Joda jars in the classpath.

All that I have left as a hint to avoid the sudden thread pool inits is
to examine the code if there are unwanted class instantiations instead of
singletons, but I'm sure you are aware of that.

@ApplicationScoped beans are tricky because they are initialized lazily
and are not really singletons in some situations. In short words I'm glad I
could leave all those EJB annoyances behind and rely on JSR 330 (Guice
style).

Jörg

On Sat, Aug 2, 2014 at 5:07 PM, John D. Ament john.d.ament@gmail.com
wrote:

Jorg,

I've looked at that before. While my app has a set of REST endpoints,
we don't really deploy anything as servlets. Everything we do is either
EJB or CDI endpoints, so trying to configure a servlet is a pain. I ended
up just building a @Singleton @Startup to boot ES by reading in
elasticsearch.yml from some config location (default = jboss's config
directory). This client is stored in an @ApplicationScoped bean and made
available throughout the ES query module I put together.

The quirks are more about how we're deploying. instead of dropping 3rd
party libs into our war, we drop them into the modules folder of WildFly
and read them that way. There are certain aspects of classloader
segregation that this raises. Specifically, I think there was an ordering
issue between lucene and ES which causes some scoping conflicts. This was
fixed by simply putting the two of them together into a single module. Not
ideal, but it got the job done.

John

On Sat, Aug 2, 2014 at 11:02 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

You surely had a look at the official support for ES in a servlet?

https://github.com/elasticsearch/elasticsearch-transport-wares/blob/master/src/main/java/org/elasticsearch/wares/NodeServlet.java

Does this approach match your setup?

I do not really prefer this approach, instead, I use a TransportClient
in a ServletContextListener, so I have a shared client instance across
servlets that I can safely start and stop when Wildfly starts and stops.

Can you clarify what are the Lucuene 4.9 quirks?

Jörg

On Sat, Aug 2, 2014 at 4:52 PM, John D. Ament john.d.ament@gmail.com
wrote:

Actually, it was more environmental than anything.
This happened after I was doing some module reconfiguration in wildfly
to deploy elasticsearch as a module, instead of embedded in the WAR. Turns
out that you need to add sun.jdk as a dependency. I didn't notice as I had
declared other dependencies on ES. So long story short - there's some
class being referenced in ES that wasn't exported by default.

I'm not sure - would you guys be interested in a doc PR to explain how
to deploy ES as a JBoss module? This way no one else has to go through my
pain. I also found some lucene 4.9 quirks.

John

On Sat, Aug 2, 2014 at 10:43 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Looks like a programming error.

Without having a look at the code "ServerService" causing this, it is
not possible to find explanations.

Jörg

On Fri, Aug 1, 2014 at 6:38 PM, John D. Ament <john.d.ament@gmail.com

wrote:

Hi all

Based on another thread I started, I'm embedding ES into my
application. Starting today, and I'm sure there's something that got
thrown into the mix causing this, we have started seeing high counts of
thread pools getting created and the application never fully booting.

I see this in the logs at a fine level:

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,731 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

2014-08-01 12:34:32,732 FINE [org.elasticsearch.threadpool]
(ServerService Thread Pool -- 19) [Sauron] creating thread_pool [generic],
type [cached], keep_alive [30s]

I wouldn't expect so many threadpools to get created. Is this
expected?

John

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