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https://issues.apache.org/jira/browse/HDFS-6021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe resolved HDFS-6021.
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Resolution: Duplicate
Resolving as a dup of HDFS-5988 since that seems like the most likely culprit.
I'll reopen if it occurs again. Thanks Andrew!
> NPE in FSImageFormatProtobuf upgrading from layout -52 to -53
> -------------------------------------------------------------
>
> Key: HDFS-6021
> URL: https://issues.apache.org/jira/browse/HDFS-6021
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Jason Lowe
>
> While updating my trunk instance the namenode refused to startup because the
> layout version needed to be upgraded. When attempting the upgrade ran into
> an NPE in FSImageFormatProtobuf. Full stacktrace to follow.
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