add log info for ObTableConnectionUnWritableException

Author: GroundWu

src/main/java/com/alipay/oceanbase/rpc/bolt/transport/ObTableConnection.java

@@ -259,7 +259,7 @@ public void reConnectAndLogin(String msg) throws ObTableException {
         } catch (ObTableServerConnectException ex) {
             throw ex;
         } catch (Exception ex) {
-            throw new ObTableConnectionStatusException("check status failed", ex);
+            throw new ObTableConnectionStatusException("check status failed, cause: " + ex.getMessage(), ex);
         }
     }
 

src/main/java/com/alipay/oceanbase/rpc/table/ObTable.java

@@ -391,7 +391,7 @@ public ObPayload execute(final ObPayload request) throws RemotingException,
         } catch (ObTableServerConnectException ex) {
             throw ex;
         } catch (Exception ex) {
-            throw new ObTableConnectionStatusException("check status failed", ex);
+            throw new ObTableConnectionStatusException("check status failed, cause: " + ex.getMessage(), ex);
         }
         return executeWithReconnect(connection, request);
     }
@@ -455,7 +455,7 @@ public ObPayload executeWithConnection(final ObPayload request,
         } catch (ObTableServerConnectException ex) {
             throw ex;
         } catch (Exception ex) {
-            throw new ObTableConnectionStatusException("check status failed", ex);
+            throw new ObTableConnectionStatusException("check status failed, cause: " + ex.getMessage(), ex);
         }
         return executeWithReconnect(connection, request);
     }