[ https://issues.apache.org/jira/browse/HDFS-27?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE resolved HDFS-27. ---------------------------------------- Resolution: Not A Problem I think this is not a problem anymore. Please feel free to reopen if I was wrong. > RPC on Datanode blocked forever. > -------------------------------- > > Key: HDFS-27 > URL: https://issues.apache.org/jira/browse/HDFS-27 > Project: Hadoop HDFS > Issue Type: Bug > Environment: Java SE 1.6.0-b105 on Linux 2.6.x > Reporter: Raghu Angadi > Attachments: datanode-jstack > > > We recently noticed a number of datanodes got stuck. The main thread that > sends heartbeats and block reports is blocked in select() in side > blockReport() RPC. I will add a stack trace in the next comment. > I am not sure why select was blocked forever since there is no connection > open to NameNode. In fact, NN was restarted in between. It could be some JDK > bug or a Hadoop bug. -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira