[jira] [Created] (TAJO-1506) WorkerConnectionInfo::id field may be not unique, but its uniqueness is assumed throughout codes.

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-1506:
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             Summary: WorkerConnectionInfo::id field may be not unique, but its 
uniqueness is assumed throughout codes.
                 Key: TAJO-1506
                 URL: https://issues.apache.org/jira/browse/TAJO-1506
             Project: Tajo
          Issue Type: Improvement
          Components: query master, worker
            Reporter: Hyunsik Choi
             Fix For: 0.11.0


WorkerConnectionInfo::id is a integer value. It is generated in Worker by a 
hashCode as follows:

{code}
public WorkerConnectionInfo(String host, int peerRpcPort, int pullServerPort, 
int clientPort,
                              int queryMasterPort, int httpInfoPort) {
...
    this.queryMasterPort = queryMasterPort;
    this.httpInfoPort = httpInfoPort;
    this.id = hashCode();
{code}

Fundamentally, it uses hashCode method, so there are possibility to cause 
duplicate integer value. But, all codes assume its uniqueness. It is a 
potential problem.



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