buxingzhe commented on issue #6428:
URL: https://github.com/apache/skywalking/issues/6428#issuecomment-784667853


   Here is the log.
   
   2021-01-11 06:06:30,964 - 
org.apache.skywalking.oap.server.telemetry.api.HealthCheckMetrics -17060395 
[pool-10-thread-1] ERROR [] - Health check fails
   java.net.SocketTimeoutException: 30,000 milliseconds timeout on connection 
http-outgoing-397 [ACTIVE]
           at 
org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:808) 
~[elasticsearch-rest-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestClient.performRequest(RestClient.java:248) 
~[elasticsearch-rest-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestClient.performRequest(RestClient.java:235) 
~[elasticsearch-rest-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1514)
 ~[elasticsearch-rest-high-level-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1484)
 ~[elasticsearch-rest-high-level-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1454)
 ~[elasticsearch-rest-high-level-client-7.5.0.jar:7.5.0]
           at 
org.elasticsearch.client.RestHighLevelClient.bulk(RestHighLevelClient.java:497) 
~[elasticsearch-rest-high-level-client-7.5.0.jar:7.5.0]
           at 
org.apache.skywalking.oap.server.storage.plugin.elasticsearch7.client.ElasticSearch7Client.synchronousBulk(ElasticSearch7Client.java:295)
 [storage-elasticsearch7-plugin-8.3.0.jar:8.3.0]
           at 
org.apache.skywalking.oap.server.storage.plugin.elasticsearch.base.BatchProcessEsDAO.synchronous(BatchProcessEsDAO.java:78)
 [storage-elasticsearch-plugin-8.3.0.jar:8.3.0]
           at 
org.apache.skywalking.oap.server.core.storage.PersistenceTimer.extractDataAndSave(PersistenceTimer.java:122)
 [server-core-8.3.0.jar:8.3.0]
           at 
org.apache.skywalking.oap.server.core.storage.PersistenceTimer.lambda$start$0(PersistenceTimer.java:78)
 [server-core-8.3.0.jar:8.3.0]
           at 
org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33)
 [apm-util-8.3.0.jar:8.3.0]
           at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
           at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) 
[?:?]
           at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
 [?:?]
           at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) 
[?:?]
           at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) 
[?:?]
           at java.lang.Thread.run(Thread.java:832) [?:?]
   Caused by: java.net.SocketTimeoutException: 30,000 milliseconds timeout on 
connection http-outgoing-397 [ACTIVE]
           at 
org.apache.http.nio.protocol.HttpAsyncRequestExecutor.timeout(HttpAsyncRequestExecutor.java:387)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:92)
 ~[httpasyncclient-4.1.4.jar:4.1.4]
           at 
org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:39)
 ~[httpasyncclient-4.1.4.jar:4.1.4]
           at 
org.apache.http.impl.nio.reactor.AbstractIODispatch.timeout(AbstractIODispatch.java:175)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.BaseIOReactor.sessionTimedOut(BaseIOReactor.java:261)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.AbstractIOReactor.timeoutCheck(AbstractIOReactor.java:502)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:211) 
~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104) 
~[httpcore-nio-4.4.12.jar:4.4.12]
           at 
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591)
 ~[httpcore-nio-4.4.12.jar:4.4.12]
           ... 1 more


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