How to enable Garbage Collector logging in an elastic search nodes..

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How to enable Garbage Collector logging in an elastic search nodes..

Anil Karaka
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
monitor.jvm.gc.young.info: 700ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
monitor.jvm.gc.old.info: 5s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..

I came across this blog post http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/

`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Mark Walkom-2
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..


`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Anil Karaka
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="hNM7-MhsX_4J" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">anilk...@...> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
<a href="http://monitor.jvm.gc.young.info" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;">monitor.jvm.gc.young.info: 700ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
<a href="http://monitor.jvm.gc.old.info" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;">monitor.jvm.gc.old.info: 5s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..

I came across this blog post <a href="http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;">http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/

`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Gavin Seng

Anil, you can try this:

# /etc/sysconfig/elasticsearch

export ES_USE_GC_LOGGING=1
ES_JAVA_OPTS="-verbose:gc -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M -Xloggc:<path to your log file>"


Gavin

On Wednesday, March 4, 2015 at 9:22:50 AM UTC-5, Anil Karaka wrote:
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
<a href="http://monitor.jvm.gc.young.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;">monitor.jvm.gc.young.info: 700ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
<a href="http://monitor.jvm.gc.old.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;">monitor.jvm.gc.old.info: 5s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..

I came across this blog post <a href="http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;">http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/

`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

--
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Re: How to enable Garbage Collector logging in an elastic search nodes..

Anil Karaka
Thanks,

I just kept those GC logging options outside the if block.. So that I don't have to set that variable, and enabled GC logging by default.

this is in the file /usr/share/elasticsearch/bin/elasticsearch.in.sh

# GC logging options
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
# Enable gc logging by default
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"


On Saturday, March 14, 2015 at 7:18:29 AM UTC+5:30, Gavin Seng wrote:

Anil, you can try this:

# /etc/sysconfig/elasticsearch

export ES_USE_GC_LOGGING=1
ES_JAVA_OPTS="-verbose:gc -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M -Xloggc:<path to your log file>"


Gavin

On Wednesday, March 4, 2015 at 9:22:50 AM UTC-5, Anil Karaka wrote:
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
<a href="http://monitor.jvm.gc.young.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;">monitor.jvm.gc.young.info: 700ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
<a href="http://monitor.jvm.gc.old.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;">monitor.jvm.gc.old.info: 5s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..

I came across this blog post <a href="http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;">http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/

`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Mark Walkom-2
It's not recommended to alter the .in.sh, this file can change between releases and your alterations can either be lost or can cause other problems.

I'd suggest you do what Gavin mentioned.

On 1 April 2015 at 18:08, Anil Karaka <[hidden email]> wrote:
Thanks,

I just kept those GC logging options outside the if block.. So that I don't have to set that variable, and enabled GC logging by default.

this is in the file /usr/share/elasticsearch/bin/elasticsearch.in.sh

# GC logging options
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
# Enable gc logging by default
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"


On Saturday, March 14, 2015 at 7:18:29 AM UTC+5:30, Gavin Seng wrote:

Anil, you can try this:

# /etc/sysconfig/elasticsearch

export ES_USE_GC_LOGGING=1
ES_JAVA_OPTS="-verbose:gc -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M -Xloggc:<path to your log file>"


Gavin

On Wednesday, March 4, 2015 at 9:22:50 AM UTC-5, Anil Karaka wrote:
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..


`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Anil Karaka
Ok, we also had to edit that file to change the default garbage collector options and are now using G1GC. So I thought I will just change the if condition to enable gc logs..

Any way, this is not the main problem, I'm trying to do all these things to debug the main issue of my nodes leaving the cluster randomly. 
https://groups.google.com/forum/#!topic/elasticsearch/E-aGhovVTPI here are more details. Any help would be appreciated.

Yesterday night I increased the zen.ping.timeout from 3s to 10s of all my machines and restarted them one by one, and yet to see if its any improvement.
Will updating elasticsearch in my nodes fix my issues? Currently my nodes are using ES-1.4.1.

Thanks.

On Thursday, April 2, 2015 at 3:02:31 AM UTC+5:30, Mark Walkom wrote:
It's not recommended to alter the .in.sh, this file can change between releases and your alterations can either be lost or can cause other problems.

I'd suggest you do what Gavin mentioned.

On 1 April 2015 at 18:08, Anil Karaka <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="XInMCLzlXLkJ" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">anilk...@...> wrote:
Thanks,

I just kept those GC logging options outside the if block.. So that I don't have to set that variable, and enabled GC logging by default.

this is in the file /usr/share/elasticsearch/bin/<a href="http://elasticsearch.in.sh" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Felasticsearch.in.sh\46sa\75D\46sntz\0751\46usg\75AFQjCNE3IlAt_VXveLf26Sy81Bd1e4_71w';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Felasticsearch.in.sh\46sa\75D\46sntz\0751\46usg\75AFQjCNE3IlAt_VXveLf26Sy81Bd1e4_71w';return true;">elasticsearch.in.sh

# GC logging options
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
# Enable gc logging by default
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"


On Saturday, March 14, 2015 at 7:18:29 AM UTC+5:30, Gavin Seng wrote:

Anil, you can try this:

# /etc/sysconfig/elasticsearch

export ES_USE_GC_LOGGING=1
ES_JAVA_OPTS="-verbose:gc -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M -Xloggc:<path to your log file>"


Gavin

On Wednesday, March 4, 2015 at 9:22:50 AM UTC-5, Anil Karaka wrote:
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
<a href="http://monitor.jvm.gc.young.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.young.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFrvYMNiDj4e9Snf7_osvOFy3L3Bg';return true;">monitor.jvm.gc.young.info: 700ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
<a href="http://monitor.jvm.gc.old.info" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Fmonitor.jvm.gc.old.info\46sa\75D\46sntz\0751\46usg\75AFQjCNFMIrSP6TXCIRyDUcuWsjWsQB-poQ';return true;">monitor.jvm.gc.old.info: 5s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..

I came across this blog post <a href="http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/" rel="nofollow" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Ftech.taskrabbit.com%2Fblog%2F2014%2F07%2F18%2Felasticsearch-in-production%2F\46sa\75D\46sntz\0751\46usg\75AFQjCNFW09Li_OUs5VrVAhwSbxwh25jdHQ';return true;">http://tech.taskrabbit.com/blog/2014/07/18/elasticsearch-in-production/

`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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Re: How to enable Garbage Collector logging in an elastic search nodes..

Mark Walkom-2
We don't recommend G1GC as it can lead to data loss and corruption in the underlying lucene engine.

On 2 April 2015 at 16:49, Anil Karaka <[hidden email]> wrote:
Ok, we also had to edit that file to change the default garbage collector options and are now using G1GC. So I thought I will just change the if condition to enable gc logs..

Any way, this is not the main problem, I'm trying to do all these things to debug the main issue of my nodes leaving the cluster randomly. 
https://groups.google.com/forum/#!topic/elasticsearch/E-aGhovVTPI here are more details. Any help would be appreciated.

Yesterday night I increased the zen.ping.timeout from 3s to 10s of all my machines and restarted them one by one, and yet to see if its any improvement.
Will updating elasticsearch in my nodes fix my issues? Currently my nodes are using ES-1.4.1.

Thanks.

On Thursday, April 2, 2015 at 3:02:31 AM UTC+5:30, Mark Walkom wrote:
It's not recommended to alter the .in.sh, this file can change between releases and your alterations can either be lost or can cause other problems.

I'd suggest you do what Gavin mentioned.

On 1 April 2015 at 18:08, Anil Karaka <[hidden email]> wrote:
Thanks,

I just kept those GC logging options outside the if block.. So that I don't have to set that variable, and enabled GC logging by default.

this is in the file /usr/share/elasticsearch/bin/elasticsearch.in.sh

# GC logging options
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
# Enable gc logging by default
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"


On Saturday, March 14, 2015 at 7:18:29 AM UTC+5:30, Gavin Seng wrote:

Anil, you can try this:

# /etc/sysconfig/elasticsearch

export ES_USE_GC_LOGGING=1
ES_JAVA_OPTS="-verbose:gc -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M -Xloggc:<path to your log file>"


Gavin

On Wednesday, March 4, 2015 at 9:22:50 AM UTC-5, Anil Karaka wrote:
Can you please tell me what exactly do I need to add in /etc/default/elasticsearch?

What should I set ES_USE_GC_LOGGING to?

I added below line in my dev ES node, and I didn't see the gc.log file in my log folder.. I want to be sure what to do before changing anything in my production cluster..

ES_USE_GC_LOGGING=true

And what are the GC logging options in my elasticsearch.yml do? where do those logs appear?

Thank you.

On Wednesday, March 4, 2015 at 3:11:26 AM UTC+5:30, Mark Walkom wrote:
You can set JAVA_OPTS in /etc/default/elasticsearch or /etc/sysconfig/elasticsearch u9nder ES_JAVA_OPTS

On 3 March 2015 at 23:11, Anil Karaka <[hidden email]> wrote:
Some of the nodes are leaving the cluster from time to time.. 

I un commented the GC Logging options in elasticsearch.yml file as shown and restarted my node.

################################## GC Logging ################################

monitor.jvm.gc.young.warn: 1000ms
monitor.jvm.gc.young.debug: 400ms

monitor.jvm.gc.old.warn: 10s
monitor.jvm.gc.old.debug: 2s


yet I'm not able to see any of the GC logging..


`ElasticSearch will note in its normal logs if any GC is happening which effects a slow query, but we wanted more detail. Another logging option ElasticSearch has is ES_USE_GC_LOGGING which sets some JVM variables:
# from elasticsearch.in.sh.erb
if [ "x$ES_USE_GC_LOGGING" != "x" ]; then
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCDetails"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCTimeStamps"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintClassHistogram"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintTenuringDistribution"
  JAVA_OPTS="$JAVA_OPTS -XX:+PrintGCApplicationStoppedTime"
  JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/elasticsearch/gc.log"
fi
`
Where do I set the ES_USE_GC_LOGGING option in my node..
so that I can log GC events..

currently there is no gc.log file in my logs folder..
just normal cluster logs and slow index/search logs..

Thanks..

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