[skywalking] 01/01: Create ES-Server-FAQ.md

[wu...@apache.org]

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wusheng pushed a commit to branch wu-sheng-patch-1
in repository https://gitbox.apache.org/repos/asf/skywalking.git

commit 727c4b3a68ad00f8ac5a72e49fe8ee171f24c415
Author: 吴晟 Wu Sheng <wu...@foxmail.com>
AuthorDate: Wed Jun 12 16:57:53 2019 +0800

    Create ES-Server-FAQ.md
---
 docs/en/FAQ/ES-Server-FAQ.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/docs/en/FAQ/ES-Server-FAQ.md b/docs/en/FAQ/ES-Server-FAQ.md
new file mode 100644
index 0000000..7abfa2f
--- /dev/null
+++ b/docs/en/FAQ/ES-Server-FAQ.md
@@ -0,0 +1,21 @@
+# ElasticSearch 
+Some new user may face the following error in ElasticSearch storage. ERROR CODE 429. Or ElasticSearch performance is not as good as expected.
+```
+    Suppressed: org.elasticsearch.client.ResponseException: method [POST], host [http://127.0.0.1:9200], URI [/service_instance_inventory/type/6_tcc-app-gateway-77b98ff6ff-crblx.cards_0_0/_update?refresh=true&timeout=1m], status line [HTTP/1.1 429 Too Many Requests]
+{"error":{"root_cause":[{"type":"remote_transport_exception","reason":"[elasticsearch-0][10.16.9.130:9300][indices:data/write/update[s]]"}],"type":"es_rejected_execution_exception","reason":"rejected execution of org.elasticsearch.transport.TransportService$7@19a5cf02 on EsThreadPoolExecutor[name = elasticsearch-0/write, queue capacity = 200, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@389297ad[Running, pool size = 2, active threads = 2, queued tasks = 200, completed ta [...]
+        at org.elasticsearch.client.RestClient$SyncResponseListener.get(RestClient.java:705) ~[elasticsearch-rest-client-6.3.2.jar:6.3.2]
+        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:235) ~[elasticsearch-rest-client-6.3.2.jar:6.3.2]
+        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:198) ~[elasticsearch-rest-client-6.3.2.jar:6.3.2]
+        at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:522) ~[elasticsearch
+```
+
+You could add following config to `elasticsearch.yml`, set the value based on your env.
+```yml
+# In tracing scenario, consider to set more than this at least.
+thread_pool.bulk.queue_size: 1000
+
+thread_pool.bulk.size: 16
+thread_pool.index.queue_size: 500
+thread_pool.write.queuq_size: 500
+index.max_result_window: 1000000
+```