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https://issues.apache.org/jira/browse/HDFS-3615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409843#comment-13409843
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Eli Collins commented on HDFS-3615:
-----------------------------------
I must have been looking at a stale tree, "Fix issue with NN/DN
re-registration" recently modified this file, is likely the culprit.
> Two BlockTokenSecretManager findbugs warnings
> ---------------------------------------------
>
> Key: HDFS-3615
> URL: https://issues.apache.org/jira/browse/HDFS-3615
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: security
> Affects Versions: 2.0.0-alpha
> Reporter: Eli Collins
>
> Looks like two findbugs warnings were introduced recently (see these across a
> couple recent patches). Unclear what change introduced it as the file hasn't
> been modified and recent committed changes pass the findbugs check.
> IS Inconsistent synchronization of
> org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager.keyUpdateInterval;
> locked 75% of time
> IS Inconsistent synchronization of
> org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager.serialNo;
> locked 75% of time
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