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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/06/26 18:33:04 UTC

[jira] [Created] (HDFS-8676) Delayed rolling upgrade finalization can cause heartbeat expiration

Kihwal Lee created HDFS-8676:
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             Summary: 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
            Priority: Critical


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.



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