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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15450) Avoid fsync storm triggered by DiskChecker and handle disk full situation
Date Tue, 08 May 2018 22:20:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HADOOP-15450:
-----------------------------------
    Description: 
Fix disk checker issues reported by [~kihwal] in HADOOP-13738

There are non-hdfs users of DiskChecker, who use it proactively, not just on failures. This
was fine before, but now it incurs heavy I/O due to introduction of fsync() in the code.

  was:
Fix disk checker issues reported by [~kihwal] in HADOOP-13738:
# When space is low, the os returns ENOSPC. Instead simply stop writing, the drive is marked
bad and replication happens. This make cluster-wide space problem worse. If the number of
"failed" drives exceeds the DFIP limit, the datanode shuts down.
# There are non-hdfs users of DiskChecker, who use it proactively, not just on failures. This
was fine before, but now it incurs heavy I/O due to introduction of fsync() in the code.


> Avoid fsync storm triggered by DiskChecker and handle disk full situation
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-15450
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15450
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Arpit Agarwal
>            Priority: Blocker
>
> Fix disk checker issues reported by [~kihwal] in HADOOP-13738
> There are non-hdfs users of DiskChecker, who use it proactively, not just on failures.
This was fine before, but now it incurs heavy I/O due to introduction of fsync() in the code.



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