今天突然hive连接不上，spark也读取不了hive报错如下：
2019-05-13 15:42:33 ERROR log:1211 - Got exception: org.apache.thrift.transport.TTransportException java.net.SocketTimeoutException: Read timed out org.apache.thrift.transport.TTransportException: java.net.SocketTimeoutException: Read timed out at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:129) at org.apache.thrift.transport.TTransport.readAll(TTransport.java:86) at org.apache.thrift.protocol.TBinaryProtocol.readAll(TBinaryProtocol.java:429) at org.apache.thrift.protocol.TBinaryProtocol.readI32(TBinaryProtocol.java:318) at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:219) at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:77) ... at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: java.net.SocketTimeoutException: Read timed out at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:170) at java.net.SocketInputStream.read(SocketInputStream.java:141) at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) at java.io.BufferedInputStream.read1(BufferedInputStream.java:286) at java.io.BufferedInputStream.read(BufferedInputStream.java:345) at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:127) ... 99 more 2019-05-13 15:42:34 ERROR log:1212 - Converting exception to MetaException 2019-05-13 15:42:34 WARN RetryingMetaStoreClient:184 - MetaStoreClient lost connection. Attempting to reconnect. MetaException(message:Got exception: org.apache.thrift.transport.TTransportException java.net.SocketTimeoutException: Read timed out) at org.apache.hadoop.hive.metastore.MetaStoreUtils.logAndThrowMetaException(MetaStoreUtils.java:1213) at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.getAllDatabases(HiveMetaStoreClient.java:1033) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ... at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:136) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
后来发现时mysql元数据库访问不了了，这个可能有的人一辈子都遇不到吧。
重启mysql元数据库就可以了。
