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https://issues.apache.org/jira/browse/HDFS-9187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940594#comment-14940594
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Colin Patrick McCabe commented on HDFS-9187:
--------------------------------------------
I think adding a NullTracer would make sense. I also think there is an easier
solution via using FsTracer.java... let me check it out
> Check if tracer is null before using it
> ---------------------------------------
>
> Key: HDFS-9187
> URL: https://issues.apache.org/jira/browse/HDFS-9187
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tracing
> Affects Versions: 2.8.0
> Reporter: stack
> Attachments: HDFS-9187.001.patch
>
>
> Saw this where an hbase that has not been updated to htrace-4.0.1 was trying
> to start:
> {code}
> Oct 1, 5:12:11.861 AM FATAL org.apache.hadoop.hbase.master.HMaster
> Failed to become active master
> java.lang.NullPointerException
> at org.apache.hadoop.fs.Globber.glob(Globber.java:145)
> at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:1634)
> at org.apache.hadoop.hbase.util.FSUtils.getTableDirs(FSUtils.java:1372)
> at
> org.apache.hadoop.hbase.util.FSTableDescriptors.getAll(FSTableDescriptors.java:206)
> at
> org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:619)
> at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:169)
> at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1481)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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