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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10688) BPServiceActor may run into a tight loop for sending block report when hitting IOException
Date Mon, 25 Jul 2016 17:51:20 GMT
Jing Zhao created HDFS-10688:
--------------------------------

             Summary: BPServiceActor may run into a tight loop for sending block report when
hitting IOException
                 Key: HDFS-10688
                 URL: https://issues.apache.org/jira/browse/HDFS-10688
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Jing Zhao
            Assignee: Chen Liang


Currently in BPServiceActor#offerService, when datanode runs into a local IOException, the
DataNode only logs the exception and runs into the while loop again:
{code}
      } catch(RemoteException re) {
        .......
        LOG.warn("RemoteException in offerService", re);
        try {
          long sleepTime = Math.min(1000, dnConf.heartBeatInterval);
          Thread.sleep(sleepTime);
        } catch (InterruptedException ie) {
          Thread.currentThread().interrupt();
        }
      } catch (IOException e) {
        LOG.warn("IOException in offerService", e);
      }
{code}

This tight loop may cause some issue. For example, in a production cluster, we saw a DataNode
hit exception when doing kerberos realm lookup. This tight loop finally caused the DataNode
to send hundreds of DNS lookup queries.



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