Elasticsearch OutOfMemoryError Java 堆空间
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Elasticsearch OutOfMemoryError Java heap space
提问by B.P
I am running an 8 cores, 32g RAM elasticsearch node with 5 shards, 400 million (small) documents.
我正在运行一个 8 核、32g RAM、具有 5 个分片、4 亿（小）文档的弹性搜索节点。
Everything works great until I run an agg search, then shards start failing with:
一切正常，直到我运行 agg 搜索，然后分片开始失败：
java.lang.OutOfMemoryError: Java heap space
I have changed heap sizewith:
export ES_HEAP_SIZE=16g(also ES_MAX_MEMand ES_MIN_MEMto same)
我已经改变了堆大小有：
export ES_HEAP_SIZE=16g（也ES_MAX_MEM并ES_MIN_MEM以相同的）
also changed the ymlfile for elasticsearch:
还更改了ymlelasticsearch的文件：
bootstrap.mlockall: true
and even (recommended by install documents):
甚至（安装文档推荐）：
sudo sysctl -w vm.max_map_count=262144
Restart service and still no no impact, still java.lang.OutOfMemoryError: Java heap space
重启服务还是没有影响，还是 java.lang.OutOfMemoryError: Java heap space
Any other suggestions? other than don't run agg queries?
还有其他建议吗？除了不运行 agg 查询？
query is:
查询是：
https://localhost:9200/my_index_name/_search?search_type=count
{
"aggs": {
"distinct_hostname": {
"cardinality": {
"field": "hostname"
}
}
}
}
回答by B.P
I think I have discovered the error. I was using 'service' to run elasticsearch and therefore my environment variables got stripped. I had to update the /etc/default/elasticsearchfile with the correcct env variables (specifically the ES_HEAP_SIZE=16g).
我想我已经发现了错误。我使用'service'来运行elasticsearch，因此我的环境变量被剥离了。我必须/etc/default/elasticsearch使用正确的环境变量（特别是ES_HEAP_SIZE=16g）更新文件。
So far it's running well and app is not erroring.
到目前为止，它运行良好，应用程序没有出错。
回答by Craig
The correct way to update Java heap size for Elasticsearch 5 is not EXPORT _JAVA_OPTIONSor EXPORT ES_HEAP_SIZEor using command line parameters. As far as I can tell, all of these are overridden by a configuration file in your Elasticsearch install directory, config/jvm.options. To change these settings you need to edit these lines in that file:
正确的方法来更新Java堆大小为Elasticsearch 5不是EXPORT _JAVA_OPTIONS或EXPORT ES_HEAP_SIZE或使用命令行参数。据我所知，所有这些都被 Elasticsearch 安装目录中的配置文件覆盖config/jvm.options。要更改这些设置，您需要编辑该文件中的这些行：
# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space
-Xms2g
-Xmx2g
