# Error Java heap space

**URL:** <https://discuss.elastic.co/t/error-java-heap-space/271837>\
**Category:** Elasticsearch\
**Created:** [April 30, 2021, 9:09pm UTC](https://discuss.elastic.co/t/error-java-heap-space/271837 "2021-04-30T21:09:02Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![TomTom](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tomtom/32/3676_2.png) [@TomTom](https://discuss.elastic.co/u/TomTom)\
**Post date:** [April 30, 2021, 9:09pm UTC](https://discuss.elastic.co/t/error-java-heap-space/271837/1 "2021-04-30T21:09:02Z")

</div>

I created an ElasticSearch server, but today it stopped and in the log it reported that the error was:

```auto
[ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [main-node] fatal error in thread [elasticsearch[main-node][search][T#7]], exiting

java.lang.OutOfMemoryError: Java heap space

```

My server has 8GB of RAM and 160GB of space. It is exclusive to the ElasticSearch server only.

Unfortunately my knowledge of ElasticSearch and Java is very limited, so I don't know what may be wrong with my server settings and what I can do to improve it.

The results of the Status and Health report are:

```auto
Cluster Health:
{
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 6,
  "active_shards" : 6,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 6,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue" : "0s",
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent" : "50.0%",
  "active_shards_percent_as_number" : 50.0
}

Cluster Stats:
{
  "_nodes" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "timestamp" : 1619816028246,
  "status" : "yellow",
  "indices" : {
    "count" : 6,
    "shards" : {
      "total" : 6,
      "primaries" : 6,
      "replication" : 0.0,
      "index" : {
        "shards" : {
          "min" : 1,
          "max" : 1,
          "avg" : 1.0
        },
        "primaries" : {
          "min" : 1,
          "max" : 1,
          "avg" : 1.0
        },
        "replication" : {
          "min" : 0.0,
          "max" : 0.0,
          "avg" : 0.0
        }
      }
    },
    "store" : {
      "size" : "51.3gb",
      "size_in_bytes" : 55094870917
    },
    "fielddata" : {
      "memory_size" : "2.7kb",
      "memory_size_in_bytes" : 2840,
      "evictions" : 0
    },
    "query_cache" : {
      "memory_size" : "12.8mb",
      "memory_size_in_bytes" : 13425080,
      "total_count" : 18312,
      "hit_count" : 2289,
      "miss_count" : 16023,
      "cache_size" : 506,
      "cache_count" : 506,
      "evictions" : 0
    },
    "completion" : {
      "size" : "0b",
      "size_in_bytes" : 0
    },
    "segments" : {
      "count" : 89,
      "memory" : "59.8mb",
      "memory_in_bytes" : 62711188,
      "terms_memory" : "30.8mb",
      "terms_memory_in_bytes" : 32377094,
      "stored_fields_memory" : "21.7mb",
      "stored_fields_memory_in_bytes" : 22810752,
      "term_vectors_memory" : "0b",
      "term_vectors_memory_in_bytes" : 0,
      "norms_memory" : "78.8kb",
      "norms_memory_in_bytes" : 80704,
      "points_memory" : "6.5mb",
      "points_memory_in_bytes" : 6895826,
      "doc_values_memory" : "533.9kb",
      "doc_values_memory_in_bytes" : 546812,
      "index_writer_memory" : "0b",
      "index_writer_memory_in_bytes" : 0,
      "version_map_memory" : "138b",
      "version_map_memory_in_bytes" : 138,
      "fixed_bit_set" : "24.2mb",
      "fixed_bit_set_memory_in_bytes" : 25450456,
      "max_unsafe_auto_id_timestamp" : -1,
      "file_sizes" : { }
    }
  },
  "nodes" : {
    "count" : {
      "total" : 1,
      "data" : 1,
      "coordinating_only" : 0,
      "master" : 1,
      "ingest" : 1
    },
    "versions" : [
      "6.8.15"
    ],
    "os" : {
      "available_processors" : 4,
      "allocated_processors" : 4,
      "names" : [
        {
          "name" : "Linux",
          "count" : 1
        }
      ],
      "pretty_names" : [
        {
          "pretty_name" : "UbuntuLTS",
          "count" : 1
        }
      ],
      "mem" : {
        "total" : "7.7gb",
        "total_in_bytes" : 8363642880,
        "free" : "1.5gb",
        "free_in_bytes" : 1707053056,
        "used" : "6.1gb",
        "used_in_bytes" : 6656589824,
        "free_percent" : 20,
        "used_percent" : 80
      }
    },
    "process" : {
      "cpu" : {
        "percent" : 25
      },
      "open_file_descriptors" : {
        "min" : 339,
        "max" : 339,
        "avg" : 339
      }
    },
    "jvm" : {
      "max_uptime" : "7m",
      "max_uptime_in_millis" : 421125,
      "versions" : [
        {
          "version" : "1.8.0_201",
          "vm_name" : "Java HotSpot(TM) 64-Bit Server VM",
          "vm_version" : "25.201-b09",
          "vm_vendor" : "Oracle Corporation",
          "count" : 1
        }
      ],
      "mem" : {
        "heap_used" : "710.6mb",
        "heap_used_in_bytes" : 745131592,
        "heap_max" : "990.7mb",
        "heap_max_in_bytes" : 1038876672
      },
      "threads" : 62
    },
    "fs" : {
      "total" : "154.8gb",
      "total_in_bytes" : 166318571520,
      "free" : "88.1gb",
      "free_in_bytes" : 94688387072,
      "available" : "88.1gb",
      "available_in_bytes" : 94671609856
    },
    "plugins" : [],
    "network_types" : {
      "transport_types" : {
        "security4" : 1
      },
      "http_types" : {
        "security4" : 1
      }
    }
  }

```

What can I do to prevent this from happening again?

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [April 30, 2021, 9:32pm UTC](https://discuss.elastic.co/t/error-java-heap-space/271837/2 "2021-04-30T21:32:05Z")

</div>

You should increase the HEAP size. You can set it to 4gb IMO.

Also I believe you have an old version of Elasticsearch. You should upgrade to 7.12.1 and use the provided JVM instead of Java8.

---

<div class="post-metadata">

**Author:** ![TomTom](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tomtom/32/3676_2.png) [@TomTom](https://discuss.elastic.co/u/TomTom)\
**Post date:** [May 1, 2021, 12:03am UTC](https://discuss.elastic.co/t/error-java-heap-space/271837/3 "2021-05-01T00:03:15Z")

</div>

Hi.  
Sorry for the question, as I don't have a lot of experience as ElasticSearch.

How do I change the configuration to use the JVM provided by default?

To increase the Heap Size, just follow this article, right?

> **[Setting the heap size | Elasticsearch Guide \[6.8\] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/6.8/heap-size.html)**

1. Item da lista

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [May 1, 2021, 1:02am UTC](https://discuss.elastic.co/t/error-java-heap-space/271837/4 "2021-05-01T01:02:20Z")

</div>

Yes. And restart.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 29, 2021, 1:02am UTC](https://discuss.elastic.co/t/error-java-heap-space/271837/5 "2021-05-29T01:02:45Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.