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https://issues.apache.org/jira/browse/HDFS-12920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17387144#comment-17387144
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Akira Ajisaka commented on HDFS-12920:
--------------------------------------
I don't think reverting HDFS-10845 is an incompatible change because the
default values are treated as the same if the time unit exists or not.
> HDFS default value change (with adding time unit) breaks old version MR
> tarball work with Hadoop 3.x
> ----------------------------------------------------------------------------------------------------
>
> Key: HDFS-12920
> URL: https://issues.apache.org/jira/browse/HDFS-12920
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: configuration, hdfs
> Reporter: Junping Du
> Assignee: Akira Ajisaka
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.4.0, 3.2.3, 3.3.2
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> After HADOOP-15059 get resolved. I tried to deploy 2.9.0 tar ball with 3.0.0
> RC1, and run the job with following errors:
> {noformat}
> 2017-12-12 13:29:06,824 INFO [main]
> org.apache.hadoop.service.AbstractService: Service
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster failed in state INITED; cause:
> org.apache.hadoop.yarn.exceptions.YarnRuntimeException:
> java.lang.NumberFormatException: For input string: "30s"
> org.apache.hadoop.yarn.exceptions.YarnRuntimeException:
> java.lang.NumberFormatException: For input string: "30s"
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:542)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:522)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1764)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:522)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:308)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$5.run(MRAppMaster.java:1722)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1886)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1719)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1650)
> {noformat}
> This is because HDFS-10845, we are adding time unit to hdfs-default.xml but
> it cannot be recognized by old version MR jars.
> This break our rolling upgrade story, so should mark as blocker.
> A quick workaround is to add values in hdfs-site.xml with removing all time
> unit. But the right way may be to revert HDFS-10845 (and get rid of noisy
> warnings).
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