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From "Kurt Young (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13960) HConnection stuck with UnknownHostException
Date Wed, 24 Jun 2015 09:51:05 GMT
Kurt Young created HBASE-13960:

             Summary: HConnection stuck with UnknownHostException 
                 Key: HBASE-13960
                 URL: https://issues.apache.org/jira/browse/HBASE-13960
             Project: HBase
          Issue Type: Bug
          Components: hbase
    Affects Versions: 0.98.8
            Reporter: Kurt Young

when put/get from hbase, if we meet a temporary dns failure causes resolve RS's host, the
error will never recovered. put/get will failed with UnknownHostException forever. 

I checked the code, and the reason maybe:
1. when RegionServerCallable or MultiServerCallable prepare(), it gets a  ClientService.BlockingInterface
stub from Hconnection
2. In HConnectionImplementation::getClient, it caches the stub with a BlockingRpcChannelImplementation
3. In BlockingRpcChannelImplementation(), 
     this.isa = new InetSocketAddress(sn.getHostname(), sn.getPort()); If we meet a  temporary
dns failure then the "address" in isa will be null.
4. then we launch the real rpc call, the following stack is:
Caused by: java.net.UnknownHostException: unknown host: r101072047.sqa.zmf.tbsite.net
	at org.apache.hadoop.hbase.ipc.RpcClient$Connection.<init>(RpcClient.java:385)
	at org.apache.hadoop.hbase.ipc.RpcClient.createConnection(RpcClient.java:351)
	at org.apache.hadoop.hbase.ipc.RpcClient.getConnection(RpcClient.java:1523)
	at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1435)
	at org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1654)
	at org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1712)

Besides, i noticed there is a protection in RpcClient:
if (remoteId.getAddress().isUnresolved()) {
        throw new UnknownHostException("unknown host: " + remoteId.getAddress().getHostName());
shouldn't we do something when this situation occurred? 

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