# ES 0.20.4 cluster can't start **URL:** \ **Category:** Elasticsearch\ **Created:** [February 8, 2013, 3:19am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660 "2013-02-08T03:19:28Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![arta](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@arta](https://discuss.elastic.co/u/arta)\ **Post date:** [February 8, 2013, 3:19am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/1 "2013-02-08T03:19:28Z")
Today I upgraded from 0.19.3 to 0.20.3. I also upgraded from jdk 1.6.0\_14 to 1.7.0\_13. I did full cluster shutdown, replaced ES, then started the cluster. While starting, some nodes (not only one) restarted by the wrapper. Here's the wrapper log. STATUS | wrapper | 2013/02/07 18:55:51 | JVM received a signal UNKNOWN (6). STATUS | wrapper | 2013/02/07 18:55:51 | JVM process is gone. ERROR | wrapper | 2013/02/07 18:55:51 | JVM exited unexpectedly. STATUS | wrapper | 2013/02/07 18:55:55 | Launching a JVM... INFO | jvm 2 | 2013/02/07 18:55:56 | WrapperManager: Initializing... Once this happens, the number\_of\_nodes in /\_cluster/health increases. I have 19 nodes, then it goes 18 when a node is restarting, then goes to 20 (not 19). elasticsearch/bin/service/elasticsearch.conf has jvm config like this: wrapper.java.additional.1=-Delasticsearch-service wrapper.java.additional.2=-Des.path.home=%ES\_HOME% wrapper.java.additional.3=-Xss256k wrapper.java.additional.4=-XX:+UseG1GC wrapper.java.additional.5=-XX:+HeapDumpOnOutOfMemoryError wrapper.java.additional.6=-Djava.awt.headless=true wrapper.java.additional.7=-XX:PermSize=256m wrapper.java.additional.8=-XX:MaxPermSize=256m wrapper.java.additional.9=-Dcom.sun.management.jmxremote wrapper.java.additional.10=-Dcom.sun.management.jmxremote.port=3333 wrapper.java.additional.11=-Dcom.sun.management.jmxremote.authenticate=false wrapper.java.additional.12=-Dcom.sun.management.jmxremote.ssl=false Two questions: - what are the possible reason the wrapper says - JVM received a signal UNKNOWN (6)? - what does having more number\_of\_nodes in \_cluster/health indicate? Thanks in advance. ---
**Author:** ![arta](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@arta](https://discuss.elastic.co/u/arta)\ **Post date:** [February 8, 2013, 3:22am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/2 "2013-02-08T03:22:59Z")
Sorry, one correction. I upgraded to 0.20.4. ---
**Author:** ![vineeth\_mohan](https://avatars.discourse-cdn.com/v4/letter/v/bc79bd/32.png) [@vineeth\_mohan](https://discuss.elastic.co/u/vineeth_mohan)\ **Post date:** [February 8, 2013, 5:08am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/3 "2013-02-08T05:08:05Z")
Can you provide the debug log Thanks Vineeth On Fri, Feb 8, 2013 at 8:52 AM, arta [artasano@sbcglobal.net](mailto:artasano@sbcglobal.net) wrote: > Sorry, one correction. I upgraded to 0.20.4. > > -- > View this message in context: > [http://elasticsearch-users.115913.n3.nabble.com/ES-0-20-4-cluster-can-t-start-tp4029492p4029493.html](http://elasticsearch-users.115913.n3.nabble.com/ES-0-20-4-cluster-can-t-start-tp4029492p4029493.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![arta](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@arta](https://discuss.elastic.co/u/arta)\ **Post date:** [February 8, 2013, 5:10am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/4 "2013-02-08T05:10:35Z")
I found crash dump? files, so I gist'ed > > Hope it helps. ---
**Author:** ![arta](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@arta](https://discuss.elastic.co/u/arta)\ **Post date:** [February 8, 2013, 5:36am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/5 "2013-02-08T05:36:55Z")
ES log around the restart time (matches with the first crash dump time) is gist'ed here: > ---
**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\ **Post date:** [February 12, 2013, 10:38pm UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/6 "2013-02-12T22:38:12Z")
Try removing the usage of G1 garbage collector, based on reports we get, its not stable yet. Prefer to stick with the default settings that come out of the box. Also, if you can get away from using JMX, and using ES stats APIs, it would be even better ๐Ÿ™‚ On Feb 8, 2013, at 6:36 AM, arta [artasano@sbcglobal.net](mailto:artasano@sbcglobal.net) wrote: > ES log around the restart time (matches with the first crash dump time) is > gist'ed here: > [gist:4736880 ยท GitHub](https://gist.github.com/artaa/4736880) > > -- > View this message in context: [http://elasticsearch-users.115913.n3.nabble.com/ES-0-20-4-cluster-can-t-start-tp4029492p4029496.html](http://elasticsearch-users.115913.n3.nabble.com/ES-0-20-4-cluster-can-t-start-tp4029492p4029496.html) > Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com). > > -- > You received this message because you are subscribed to the Google Groups "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![arta](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@arta](https://discuss.elastic.co/u/arta)\ **Post date:** [February 12, 2013, 11:16pm UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/7 "2013-02-12T23:16:20Z")
Thank you Kimchy. I will definitely try that. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:51am UTC](https://discuss.elastic.co/t/es-0-20-4-cluster-cant-start/10660/8 "2017-07-06T02:51:46Z")