fix: connect abort and improve log

java/openmldb-spark-connector/src/main/java/com/_4paradigm/openmldb/spark/OpenmldbTable.java

@@ -63,6 +63,7 @@ public OpenmldbTable(String dbName, String tableName, SdkOption option, String w
             // no need to check table exists, schema() will check it later
         } catch (SqlException e) {
             e.printStackTrace();
+            throw new RuntimeException("connect to openmldb failed", e); // abort immediately
         }
         // TODO: cache schema & delete executor?
     }

java/openmldb-taskmanager/src/main/java/com/_4paradigm/openmldb/taskmanager/config/TaskManagerConfig.java

@@ -243,6 +243,7 @@ private void init() throws ConfigException {
         }
 
         // Get properties and check
+        // server.host will be used by RunBatchSql, it's not good to be null
         if (props.getProperty("server.host") == null) {
             props.setProperty("server.host", "0.0.0.0");
         }
@@ -357,14 +358,13 @@ private void init() throws ConfigException {
             }
         }
 
-        String SPARK_HOME = firstNonEmpty(props.getProperty("spark.home"), System.getenv("SPARK_HOME"));
+        String SPARK_HOME = firstNonEmpty(props.getProperty("spark.home"));
         // isEmpty checks null and empty
         if (isEmpty(SPARK_HOME)) {
             throw new ConfigException("spark.home", "should set config 'spark.home' or environment variable 'SPARK_HOME'");
         }
-        if (SPARK_HOME != null) {
-            props.setProperty("spark.home", SPARK_HOME);
-        }
+        // rewrite env for spark submit
+        props.setProperty("spark.home", SPARK_HOME);
 
         // TODO: Check if we can get spark-submit
 

java/openmldb-taskmanager/src/main/java/com/_4paradigm/openmldb/taskmanager/server/TaskManagerServer.java

@@ -138,7 +138,7 @@ public static void main(String[] args) {
             server.start();
         } catch (Exception e) {
             e.printStackTrace();
-            logger.error(String.format("Fail to start TaskManager, message: ", e.getMessage()));
+            logger.error("Fail to start TaskManager", e);
         }
     }