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https://issues.apache.org/jira/browse/HDFS-2672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190621#comment-13190621
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Harsh J commented on HDFS-2672:
-------------------------------
Brandon - The latter is on the branch-1. The former may have been refactored
since, so OP may have to update on the right location.
> possible Cases for NullPointerException
> ---------------------------------------
>
> Key: HDFS-2672
> URL: https://issues.apache.org/jira/browse/HDFS-2672
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: kavita sharma
> Priority: Trivial
>
> NullPointerException can be thrown as null check is not added in DFSClient
> and UpgradeManagerNamenode.
> {noformat}
> DFSClient.java
> Block newBlock = primary.getBlockInfo(last.getBlock());
> if newBlock comes null then NullPointerException will be thrown.
> {noformat}
> {noformat}
> UpgradeManagerNamenode.java
> uos = UpgradeObjectCollection.getDistributedUpgrades(-4,
> HdfsConstants.NodeType.NAME_NODE);
> if uos will come null then NullPointerException will be thrown.
> {noformat}
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