SevenBlue2018 opened a new issue #3184: skywalking oapServer CPU 100% URL: https://github.com/apache/skywalking/issues/3184 The Question is as follow： skywalking oapServer CPU is in 100% by standalone mode. The storage is ElasticSearch by standalone mode。CPU & Memory。 I want to use jstack, but give me some error messages: `[root@iZbp1d40aso0xvdm5qgsawZ ~]# jstack 12145 | more 12145: Unable to open socket file: target process not responding or HotSpot VM not loaded The -F option can be used when the target process is not responding` skywalking oapServer log： `2019-07-29 12:50:02,964 - org.elasticsearch.client.RestClient - 65 [I/O dispatcher 1] WARN [] - request [POST http://172.16.4.52:9200/register_lock/type/16/_update?refresh=true&version=16117&timeout=1m] returned 1 warnings: [299 Elasticsearch-6.7.2-56c6e48 "Usage of internal versioning for optimistic concurrency control is deprecated and will be removed. Please use the if_seq_noandif_primary_termparameters instead. (request for index [register_lock], type [type], id [16])"]` Runtime Environment： jdk version：1.8.0_211-b12 Skywalking version：6.2.0
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