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https://issues.apache.org/jira/browse/HDFS-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121662#comment-13121662
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Todd Lipcon commented on HDFS-1973:
-----------------------------------
One small thing I didn't notice before (sorry):
- in the test cases, you have new methods verifyFileContents and
writeContentsToFile. These are very similar to AppendTestUtil.write and
AppndTestUtil.check. Can you use those instead? If not, you should fix the call
to {{in.read}} to use {{IOUtils.readFully}} since {{read}} isn't guaranteed to
read the whole length.
> HA: HDFS clients must handle namenode failover and switch over to the new
> active namenode.
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-1973
> URL: https://issues.apache.org/jira/browse/HDFS-1973
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Suresh Srinivas
> Assignee: Aaron T. Myers
> Attachments: HDFS-1973-HDFS-1623.patch, HDFS-1973-HDFS-1623.patch,
> HDFS-1973-HDFS-1623.patch, HDFS-1973-HDFS-1623.patch, hdfs-1973.0.patch
>
>
> During failover, a client must detect the current active namenode failure and
> switch over to the new active namenode. The switch over might make use of IP
> failover or some thing more elaborate such as zookeeper to discover the new
> active.
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