Question about the "peer.getPeerIndex()" API in Hama

[顾荣]

Hi,

I have a Hama cluster of 3 nodes. The host name of the nodes are slave019,
slave020, slave021. I wirte a simple program to test the PeerIndex and
PeerName info in Hama.

In setup function, I choose a peer as master, and the in bsp function each
peer get its PeerIndex and its PeerName by peer.getPeerIndex() and
peer.getPeerName()  API and send it to the master peer. Lastly, in cleanup
function of the master peer, it write out the messages in its queue. The
result is below:

    peerName: slave020:61001    peerIndex: -7
    peerName: slave019:61002    peerIndex: 4
    peerName: slave021:61001    peerIndex: 6
    peerName: slave019:61001    peerIndex: -1
    peerName: slave021:61002    peerIndex: -8
    peerName: slave020:61002    peerIndex: -7
    peerName: slave019:61003    peerIndex: 5
    peerName: slave021:61003    peerIndex: 7
    peerName: slave020:61003    peerIndex: -7

The peerNames are reasonable, but I am confused with the peerIndex
information. What does they mean? According to the source code of
BSPPeer.java, the comment message is below
   /**
   * @return the index of this peer from sorted array by name.
   */
  public int getPeerIndex();

However, the peerIndex messages I got seem not to be so....Can you give me
a hint?

Thanks in advance.

Walker