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Add section about jvm heap size to Elasticsearch doc #1348

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merged 4 commits into from
Jul 26, 2019
Merged

Add section about jvm heap size to Elasticsearch doc #1348

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3599ea5
Add doc paragraph about jvm heap size
Jul 23, 2019
bd9d355
PR fixes
Jul 23, 2019
c12d5c2
Update docs/elasticsearch-spec.asciidoc
david-kow Jul 24, 2019
08f4d29
PR fix - rewording
Jul 26, 2019
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23 changes: 23 additions & 0 deletions docs/elasticsearch-spec.asciidoc
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Expand Up @@ -22,6 +22,29 @@ Advanced settings
- Pod disruption budget
- Change budget (maxUnavailable, maxSurge)

[id="{p}-jvm-heap-size"]
=== JVM heap size

By default, JVM heap used by Elasticsearch has minimum and maximum size set to 1 GB. Since it's not recommended for heap size to exceed 50% of RAM size, ECK will default to requesting 2Gi of memory. You can change JVM heap size by using `ES_JAVA_OPTS` environment variable. You can adjust pod memory accordingly by setting the resource requests. Both changes are shown below. For more information on setting the heap size, see link:https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html[Setting the heap size].
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[source,yaml]
----
spec:
nodes:
- podTemplate:
spec:
containers:
- name: elasticsearch
env:
- name: ES_JAVA_OPTS
value: -Xms2g -Xmx2g
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resources:
requests:
memory: 4Gi
limits:
memory: 4Gi
----

[id="{p}-node-configuration"]
=== Node configuration

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