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https://issues.apache.org/jira/browse/HDFS-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-7744:
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Attachment: HDFS-7744.002.patch
> Fix potential NPE in DFSInputStream after setDropBehind or setReadahead is
> called
> ---------------------------------------------------------------------------------
>
> Key: HDFS-7744
> URL: https://issues.apache.org/jira/browse/HDFS-7744
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: dfsclient
> Affects Versions: 2.6.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-7744.001.patch, HDFS-7744.002.patch
>
>
> Fix a potential NPE in DFSInputStream after setDropBehind or setReadahead is
> called. These functions clear the {{blockReader}}, but don't set
> {{blockEnd}} to -1, which could lead to {{DFSInputStream#seek}} attempting to
> derference {{blockReader}} even though it is {{null}}.
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