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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