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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (Created) (JIRA)" <ji...@apache.org> on 2012/03/01 00:43:58 UTC

[jira] [Created] (HDFS-3032) Lease renewer tries forever even if renewal is not possible

Lease renewer tries forever even if renewal is not possible
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                 Key: HDFS-3032
                 URL: https://issues.apache.org/jira/browse/HDFS-3032
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs client
    Affects Versions: 0.23.0, 0.24.0, 0.23.1
            Reporter: Kihwal Lee
            Assignee: Kihwal Lee
             Fix For: 0.24.0, 0.23.2, 0.23.3


When LeaseRenewer gets an IOException while attempting to renew for a client, it retries after sleeping 500ms. If the exception is caused by a condition that will never change, it keeps talking to the name node until the DFSClient object is closed or aborted.  With the FileSystem cache, a DFSClient can stay alive for very long time. We've seen the cases in which node managers and long living jobs flooding name node with this type of calls.

The current proposal is to abort the client when RemoteException is caught during renewal. LeaseRenewer already does abort on all clients when it sees a SocketTimeoutException.

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