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Posted to issues@hbase.apache.org by "Yu Li (JIRA)" <ji...@apache.org> on 2016/02/02 07:45:39 UTC
[jira] [Commented] (HBASE-13960) HConnection stuck with
UnknownHostException
[ https://issues.apache.org/jira/browse/HBASE-13960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127772#comment-15127772 ]
Yu Li commented on HBASE-13960:
-------------------------------
ping...
> 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
> Assignee: Yu Li
> Attachments: HBASE-13960-0.98-v1.patch, HBASE-13960-update.patch, HBASE-13960-update.v2.patch, HBASE-13960-v2.patch
>
>
> 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: xxx.host2
> 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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