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From "Akihiro Suda (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-4301) NM disk health checker should have a timeout
Date Tue, 27 Oct 2015 05:21:27 GMT
Akihiro Suda created YARN-4301:

             Summary: NM disk health checker should have a timeout
                 Key: YARN-4301
                 URL: https://issues.apache.org/jira/browse/YARN-4301
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Akihiro Suda

The disk health checker [verifies a disk|https://github.com/apache/hadoop/blob/96677bef00b03057038157efeb3c2ad4702914da/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java#L371-L385]
by executing {{mkdir}} and {{rmdir}} periodically.
If these operations does not return in a moderate timeout, the disk should be marked bad,
and thus {{nodeInfo.nodeHealthy}} should flip to {{false}}.

I confirmed that current YARN does not have an implicit timeout (on JDK7, Linux 4.2, ext4)
using [Earthquake|https://github.com/osrg/earthquake], our fault injector for distributed
(I'll introduce the reproduction script in a while)

I consider we can fix this issue by making [{{NodeHealthCheckerServer.isHealthy()}}|https://github.com/apache/hadoop/blob/96677bef00b03057038157efeb3c2ad4702914da/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NodeHealthCheckerService.java#L69-L73]
return {{false}} if the value of {{this.getLastHealthReportTime()}} is too old.

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