Avery Ching commented on GIRAPH-72:

Ah, you can set the base rpc port by the way, sorry forgot to mention.

    /** Initial port to start using for the RPC communication */
    public static final String RPC_INITIAL_PORT = "giraph.rpcInitialPort";
    /** Default port to start using for the RPC communication */
    public static final int RPC_INITIAL_PORT_DEFAULT = 30000;

The right thing is to fix the failures early on in the application in general 
(something that doesn't kick in until after the first checkpoint currently).  
Let's address that issue after GIRAPH-11.  It's a monstrous change that is 
working right now (passed local and MR unittests) and will change a lot on how 
to do that exactly.  Thanks for filing the issue, agreed it's a problem.
> Running multiple Giraph jobs on the same cluster can lead to port collisions
> ----------------------------------------------------------------------------
>                 Key: GIRAPH-72
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-72
>             Project: Giraph
>          Issue Type: Bug
>          Components: lib, zookeeper
>    Affects Versions: 0.70.0
>         Environment: production hadoop cluster, in-process ZK.
>            Reporter: Jake Mannix
> Had a Giraph mini-hackathon at work today, and lots of us launched 
> simultaneous test jobs at the same time, and often ran into the following 
> collision:
> ------
> startSuperstep: WORKER_ONLY - Attempt=0, Superstep=-1
> 2-Nov-2011 23:40:08
> java.net.BindException: Problem binding to <hostname>/<hostIP>:30000 : 
> Address already in use
>       at org.apache.hadoop.ipc.Server.bind(Server.java:196)
>       at org.apache.hadoop.ipc.Server$Listener.(Server.java:259)
>       at org.apache.hadoop.ipc.Server.(Server.java:1039)
>       at org.apache.hadoop.ipc.RPC$Server.(RPC.java:492)
>       at org.apache.hadoop.ipc.RPC.getServer(RPC.java:454)
>       at 
> org.apache.giraph.comm.RPCCommunications.getRPCServer(RPCCommunications.java:99)
>       at 
> org.apache.giraph.comm.BasicRPCCommunications.(BasicRPCCommunications.java:362)
>       at org.apache.giraph.comm.RPCCommunications.(RPCCommunications.java:71)
>       at org.apache.giraph.graph.GraphMapper.map(GraphMapper.java:570)
>       at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>       at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:583)
>       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
>       at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: java.net.BindException: Address already in use
>       at sun.nio.ch.Net.bind(Native Method)
>       at 
> sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:126)
>       at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59)
>       at org.apache.hadoop.ipc.Server.bind(Server.java:194)
>       ... 12 more
> ----
> The job then simply hung.  What it should do, I'd imagine, is at a bare 
> minimum, catch this exception and allow the task to die quickly so it can get 
> retried on another machine, or better yet, allow for a command-line arg at 
> startup (and then passed into the Configuration) decide what ports to use.  
> Best yet, something automagic which allows multiple GraphMappers on the same 
> machine without manually picking ports (pick one at random and store it in 
> zookeeper?  but then what about the in-process zookeeper...) 

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