# Es node suddenly OOM with "fatal error on the network layer"

**URL:** <https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746>\
**Category:** Elasticsearch\
**Created:** [April 21, 2019, 9:31am UTC](https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746 "2019-04-21T09:31:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![shjdwxy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shjdwxy/32/43102_2.png) [@shjdwxy](https://discuss.elastic.co/u/shjdwxy)\
**Post date:** [April 21, 2019, 9:31am UTC](https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746/1 "2019-04-21T09:31:14Z")

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hi,  
ES version: 5.4.3  
java version: 1.8.0\_162

ES was running normally and GC is normal too. But one node suddenly OOM with "fatal error on the network layer"

logs link:

> <https://gist.github.com/wangxiangyu/52693396321930ee040245b2ef7356a6>

Does anyone meet this before? How to debug this problem ?

Thank you in advance!

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [April 21, 2019, 11:49am UTC](https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746/2 "2019-04-21T11:49:03Z")

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> [@shjdwxy](#):
>
> How to debug this problem ?

By default Elasticsearch will write a heap dump when it encounters an `OutOfMemoryError`. The best thing to do is to open this heap dump (e.g. in [MAT](https://www.eclipse.org/mat/)) and investigate what was using all the heap.

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<div class="post-metadata">

**Author:** ![shjdwxy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shjdwxy/32/43102_2.png) [@shjdwxy](https://discuss.elastic.co/u/shjdwxy)\
**Post date:** [April 21, 2019, 12:03pm UTC](https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746/3 "2019-04-21T12:03:46Z")

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thanks， I will try

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 19, 2019, 12:04pm UTC](https://discuss.elastic.co/t/es-node-suddenly-oom-with-fatal-error-on-the-network-layer/177746/4 "2019-05-19T12:04:02Z")

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