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https://issues.apache.org/jira/browse/HADOOP-15450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal updated HADOOP-15450:
-----------------------------------
Description:
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.
was:
Fix disk checker issues reported by [~kihwal] in HADOOP-13738:
1. 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.
1. 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: Arpit Agarwal
> Assignee: Arpit Agarwal
> Priority: Major
>
> 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.
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