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https://issues.apache.org/jira/browse/HDFS-13538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016871#comment-18016871
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ASF GitHub Bot commented on HDFS-13538:
---------------------------------------
aswinmprabhu opened a new pull request, #7915:
URL: https://github.com/apache/hadoop/pull/7915
### Description of PR
DiskChecker was enhanced to do checking with some i/o in
[HADOOP-13738](https://issues.apache.org/jira/browse/HADOOP-13738). But this
was rolled back partially because of fsync issue seen in
[HADOOP-15450](https://issues.apache.org/jira/browse/HADOOP-15450) and the
problem of disk full being flagged as a check failure
([HDFS-13538](https://issues.apache.org/jira/browse/HDFS-13538)).
This PR tries to address HDFS-13538 and enable i/o based disk checking ONLY
for HDFS with a flag that can be turned on in dfs configs.
### How was this patch tested?
```
[INFO] -------------------------------------------------------
[INFO] T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.hadoop.util.TestDiskCheckerWithDiskIo
[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.129
s
> HDFS DiskChecker should handle disk full situation
> --------------------------------------------------
>
> Key: HDFS-13538
> URL: https://issues.apache.org/jira/browse/HDFS-13538
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Arpit Agarwal
> Priority: Critical
> Attachments: HDFS-13538.01.patch
>
>
> 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.
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