# ES master nodes CPU usage decrease over time and became red nodes

**URL:** <https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366>\
**Category:** Elasticsearch\
**Created:** [August 10, 2020, 8:30am UTC](https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366 "2020-08-10T08:30:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Zeroc0pter](https://avatars.discourse-cdn.com/v4/letter/z/34f0e0/32.png) [@Zeroc0pter](https://discuss.elastic.co/u/Zeroc0pter)\
**Post date:** [August 10, 2020, 8:30am UTC](https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366/1 "2020-08-10T08:30:42Z")

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Hi People,

We have issues with our ElasticSearch cluster. Somehow, the CPU usage of the master nodes decreases over time (couple of days) and then crashes the cluster's state.

A screenshot of the CPU usage of Master 1:

 ![Screenshot 2020-08-10 at 10.13.39](https://us1.discourse-cdn.com/elastic/original/3X/d/3/d38110266b4d1969548282cba64d5bbb08da6d00.png)

We had to restart every node one-by-one to get the cluster up-and-running. We couldn't find related issues in es-cluster.log and in the gc.log file from that day, nothing different than common 'org.elasticsearch.index.mapper.MapperParsingException: failed to parse field [finished\_processing.response.Result] of type [float] in document with id 'zLJXtnMBAqpKShEiTlJF'  
' issues.

Does someone know what process/issue could cause this issue? Did someone experienced it before?

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [August 10, 2020, 8:50am UTC](https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366/2 "2020-08-10T08:50:19Z")

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Which version are you using? What is the size and specification of the cluster? How much data does it hold in terms of size on disk and shard count?

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**Author:** ![Zeroc0pter](https://avatars.discourse-cdn.com/v4/letter/z/34f0e0/32.png) [@Zeroc0pter](https://discuss.elastic.co/u/Zeroc0pter)\
**Post date:** [August 10, 2020, 9:28am UTC](https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366/3 "2020-08-10T09:28:34Z")

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Hi Christian,

We use version 6.8.10.

```auto
"nodes": {
    "count": {
      "total": 5,
      "data": 4,
      "coordinating_only": 1,
      "master": 3,
      "ingest": 4
    },
    "versions": [
      "6.8.10"
    ],
    "os": {
      "available_processors": 36,
      "allocated_processors": 36,
      "names": [
        {
          "name": "Linux",
          "count": 5
        }
      ],
"indices": {
    "count": 589,
    "shards": {
      "total": 5722,
      "primaries": 2861,
      "replication": 1,

```

We've got 589 indices and 5722 shards. A total of 1.8 TB data.

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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:** [September 7, 2020, 9:28am UTC](https://discuss.elastic.co/t/es-master-nodes-cpu-usage-decrease-over-time-and-became-red-nodes/244366/4 "2020-09-07T09:28:38Z")

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