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https://issues.apache.org/jira/browse/HDFS-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123717#comment-16123717
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John Zhuge commented on HDFS-11303:
-----------------------------------
TestDirectoryScanner was known to be flaky:
{noformat}
Tests run: 6, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 164.607 sec <<<
FAILURE! - in org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner
testThrottling(org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner)
Time elapsed: 151.664 sec <<< FAILURE!
java.lang.AssertionError: Throttle is too permissive
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.assertTrue(Assert.java:41)
at
org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner.testThrottling(TestDirectoryScanner.java:718)
{noformat}
So unless there is an objection, I will commit pretty soon.
> Hedged read might hang infinitely if read data from all DN failed
> ------------------------------------------------------------------
>
> Key: HDFS-11303
> URL: https://issues.apache.org/jira/browse/HDFS-11303
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 3.0.0-alpha1
> Reporter: Chen Zhang
> Assignee: Chen Zhang
> Attachments: HDFS-11303-001.patch, HDFS-11303-001.patch,
> HDFS-11303-002.patch, HDFS-11303-002.patch, HDFS-11303.003.patch,
> HDFS-11303.004.patch, HDFS-11303.005.patch
>
>
> Hedged read will read from a DN first, if timeout, then read other DNs
> simultaneously.
> If read all DN failed, this bug will cause the future-list not empty(the
> first timeout request left in list), and hang in the loop infinitely
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