今天在现场的哥们发来异常，让我解决，错误信息如下：
复制代码 代码如下:
HTTP Status 500 - Read operation to server 192.168.1.110:20001 failed on database wpdb; nested exception is com.mongodb.MongoException$Network: Read operation to server 192.168.1.110:20001 failed on database wpdb
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type Exception report
message Read operation to server 192.168.1.110:20001 failed on database wpdb; nested exception is com.mongodb.MongoException$Network: Read operation to server 192.168.1.110:20001 failed on database wpdb
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.dao.DataAccessResourceFailureException: Read operation to server 192.168.1.110:20001 failed on database wpdb; nested exception is com.mongodb.MongoException$Network: Read operation to server 192.168.1.110:20001 failed on database wpdb
org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:56)
org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:1913)
org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1743)
org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1557)
org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:497)
com.geoway.ime.tile.dao.impl.TileDaoImpl.getTile(TileDaoImpl.java:60)
com.geoway.ime.tile.service.impl.TileServiceImpl.getTile(TileServiceImpl.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.cache.interceptor.CacheInterceptor$1.invoke(CacheInterceptor.java:58)
org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:211)
org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
com.sun.proxy.$Proxy50.getTile(Unknown Source)
com.geoway.ime.server.rest.TileServer.getTileKVP(TileServer.java:60)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
root cause
com.mongodb.MongoException$Network: Read operation to server 192.168.1.110:20001 failed on database wpdb
com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:308)
com.mongodb.DBTCPConnector.call(DBTCPConnector.java:279)
com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:84)
com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:66)
com.mongodb.DBCollection.findOne(DBCollection.java:870)
com.mongodb.DBCollection.findOne(DBCollection.java:844)
com.mongodb.DBCollection.findOne(DBCollection.java:790)
org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:1980)
org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:1965)
org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1739)
org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1557)
org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:497)
com.geoway.ime.tile.dao.impl.TileDaoImpl.getTile(TileDaoImpl.java:60)
com.geoway.ime.tile.service.impl.TileServiceImpl.getTile(TileServiceImpl.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.cache.interceptor.CacheInterceptor$1.invoke(CacheInterceptor.java:58)
org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:211)
org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
com.sun.proxy.$Proxy50.getTile(Unknown Source)
com.geoway.ime.server.rest.TileServer.getTileKVP(TileServer.java:60)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
root cause
java.net.SocketTimeoutException: Read timed out
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:129)
java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
java.io.BufferedInputStream.read(BufferedInputStream.java:317)
org.bson.io.Bits.readFully(Bits.java:48)
org.bson.io.Bits.readFully(Bits.java:35)
org.bson.io.Bits.readFully(Bits.java:30)
com.mongodb.Response.<init>(Response.java:42)
com.mongodb.DBPort$1.execute(DBPort.java:141)
com.mongodb.DBPort$1.execute(DBPort.java:135)
com.mongodb.DBPort.doOperation(DBPort.java:164)
com.mongodb.DBPort.call(DBPort.java:135)
com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:300)
com.mongodb.DBTCPConnector.call(DBTCPConnector.java:279)
com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:84)
com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:66)
com.mongodb.DBCollection.findOne(DBCollection.java:870)
com.mongodb.DBCollection.findOne(DBCollection.java:844)
com.mongodb.DBCollection.findOne(DBCollection.java:790)
org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:1980)
org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:1965)
org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1739)
org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1557)
org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:497)
com.geoway.ime.tile.dao.impl.TileDaoImpl.getTile(TileDaoImpl.java:60)
com.geoway.ime.tile.service.impl.TileServiceImpl.getTile(TileServiceImpl.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.cache.interceptor.CacheInterceptor$1.invoke(CacheInterceptor.java:58)
org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:211)
org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
com.sun.proxy.$Proxy50.getTile(Unknown Source)
com.geoway.ime.server.rest.TileServer.getTileKVP(TileServer.java:60)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.41 logs.
由异常来看，是由于MongoDB连接超时造成的。于是，往MongoDB上找原因。首先上MongoDB的配置文件：
复制代码 代码如下:
mongodb.replica-set=192.98.12.242:30007,192.98.12.245:30007
mongodb.hostname=192.98.12.245
mongodb.port=30007
mongodb.connections-per-host=1000
mongodb.threads-allowed-to-block-for-connection-multiplier=200
mongodb.connect-timeout=2000
mongodb.max-wait-time=2000
mongodb.auto-connect-retry=true
mongodb.socket-keep-alive=true
mongodb.socket-timeout=1500
mongodb.slave-ok=true
mongodb.write-number=1
mongodb.write-timeout=1000
mongodb.write-fsync=true
mongodb.dbname=shardvectordb
mongodb.dbuser=
mongodb.dbpassword=
连接时间2秒。然后在定位mongodb的查询，结果为6、7秒。原来是这个原因。然后定位，一个查询为什么耗时那么久呢？
经过排查，原来是查询字段没有创建索引。然后把索引创建，查询几十毫秒，ok问题全部解决。
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