Review Request 18729: TAJO-646: TajoClient is blocked while main thread finished.

[hyoungjun kim]

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https://reviews.apache.org/r/18729/
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Review request for Tajo.


Bugs: TAJO-646
    https://issues.apache.org/jira/browse/TAJO-646


Repository: tajo


Description
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I tested Tajo JDBC Driver like bellow. After closing connection the TestCase 
still running. 
{code}
public static void main(String[] args) throws Exception {
        Class.forName("org.apache.tajo.jdbc.TajoDriver").newInstance();
        Connection conn = DriverManager
                        .getConnection("jdbc:tajo://127.0.0.1:26002");

        Statement stmt = null;
        ResultSet rs = null;
        try {
                stmt = conn.createStatement();
                rs = stmt.executeQuery("select * from table1");
                while (rs.next()) {
                        System.out.println(rs.getString(1) + "," + 
rs.getString(3));
                }
        } finally {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
        }
}
{code}


Diffs
-----

  
tajo-catalog/tajo-catalog-client/src/main/java/org/apache/tajo/catalog/AbstractCatalogClient.java
 1a7e54c67f1b81a949c9b5cb7c9514d713cee0bb 
  tajo-client/src/main/java/org/apache/tajo/client/TajoClient.java 
d9c511e6920032f819cdf61302f6d6108945349b 
  tajo-client/src/main/java/org/apache/tajo/jdbc/TajoResultSet.java 
942107c9151797763758e97813f06e3a19d5c959 
  tajo-jdbc/src/main/java/org/apache/tajo/jdbc/TajoStatement.java 
b3afcdb2d9f3e6393e27e2657bc103e86733589d 
  tajo-rpc/src/main/java/org/apache/tajo/rpc/ServerCallable.java 
3f724e8c7cb98ee5eee5e99e0829feb7ecce809d 
  tajo-rpc/src/test/java/org/apache/tajo/rpc/TestBlockingRpc.java 
ba2b9193fe7a962127c5a45641225b1d557732d4 

Diff: https://reviews.apache.org/r/18729/diff/


Testing
-------


Thanks,

hyoungjun kim