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https://issues.apache.org/jira/browse/HDFS-15820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278911#comment-17278911
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Shashikant Banerjee commented on HDFS-15820:
--------------------------------------------
[~smeng], can you help review this?
> Ensure snapshot root trash provisioning happens only post safe mode exit
> ------------------------------------------------------------------------
>
> Key: HDFS-15820
> URL: https://issues.apache.org/jira/browse/HDFS-15820
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Shashikant Banerjee
> Assignee: Shashikant Banerjee
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, on namenode startup, snapshot trash root provisioning starts as
> along with trash emptier service but namenode might not be out of safe mode
> by then. This can fail the snapshot trash dir creation thereby crashing the
> namenode. The idea here is to trigger snapshot trash provisioning only post
> safe mode exit.
> {code:java}
> 2021-02-04 11:23:47,323 ERROR
> org.apache.hadoop.hdfs.server.namenode.NameNode: Error encountered requiring
> NN shutdown. Shutting down immediately.
> org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create
> directory /upgrade/.Trash. Name node is in safe mode.
> The reported blocks 0 needs additional 1383 blocks to reach the threshold
> 0.9990 of total blocks 1385.
> The number of live datanodes 0 needs an additional 1 live datanodes to reach
> the minimum number 1.
> Safe mode will be turned off automatically once the thresholds have been
> reached. NamenodeHostName:quasar-brabeg-5.quasar-brabeg.root.hwx.site
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.newSafemodeException(FSNamesystem.java:1542)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkNameNodeSafeMode(FSNamesystem.java:1529)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:3288)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAndProvisionSnapshotTrashRoots(FSNamesystem.java:8269)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.startActiveServices(NameNode.java:1939)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.ActiveState.enterState(ActiveState.java:61)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:967)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:936)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1673)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1740)
> 2021-02-04 11:23:47,334 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot
> create directory /upgrade/.Trash. Name node is in safe mode.
> {code}
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