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Walter Su commented on HDFS-8676: --------------------------------- Thanks Lee for reviewing. I'm on holiday. I'll update it soon. > Delayed rolling upgrade finalization can cause heartbeat expiration > ------------------------------------------------------------------- > > Key: HDFS-8676 > URL: https://issues.apache.org/jira/browse/HDFS-8676 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: Kihwal Lee > Assignee: Walter Su > Priority: Critical > Attachments: HDFS-8676.01.patch > > > In big busy clusters where the deletion rate is also high, a lot of blocks > can pile up in the datanode trash directories until an upgrade is finalized. > When it is finally finalized, the deletion of trash is done in the service > actor thread's context synchronously. This blocks the heartbeat and can > cause heartbeat expiration. > We have seen a namenode losing hundreds of nodes after a delayed upgrade > finalization. The deletion of trash directories should be made asynchronous. -- This message was sent by Atlassian JIRA (v6.3.4#6332)