[jira] [Created] (HDFS-14694) Call recoverLease on DFSOutputStream close exception

["Chen Zhang (JIRA)" <ji...@apache.org>]

Chen Zhang created HDFS-14694:
---------------------------------

             Summary: Call recoverLease on DFSOutputStream close exception
                 Key: HDFS-14694
                 URL: https://issues.apache.org/jira/browse/HDFS-14694
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
            Reporter: Chen Zhang


HDFS uses file-lease to manage opened files, when a file is not closed normally, NN will recover lease automatically after hard limit exceeded. But for a long running service(e.g. HBase), the hdfs-client will never die and NN don't have any chance to recover the file.

Usually client needs to process exceptions to avoid this condition(e.g. HBase will automatically recover lease for files that not closed normally), but in our experience, most services (in our company) don't process this condition properly, which will cause lots of files in abnormal status and even data loss.

This Jira propose to add a feature that call recoverLease operation automatically when DFSOutputSteam close encounters exception. It should be disabled by default, but when somebody builds a long-running service based on HDFS, they can enable this option.

We've add this feature to our internal distribution for more than 3 years, it's quite useful according our experience.



--
This message was sent by Atlassian JIRA
(v7.6.14#76016)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-help@hadoop.apache.org