[jira] [Commented] (HDFS-5403) WebHdfs client cannot communicate with older WebHdfs servers post HDFS-5306

["Aaron T. Myers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802356#comment-13802356 ] 

Aaron T. Myers commented on HDFS-5403:
--------------------------------------

For reference, this results in an error like the following:

{quote}
java.lang.NullPointerException
at org.apache.hadoop.hdfs.web.JsonUtil.toDatanodeInfo(JsonUtil.java:305)
at org.apache.hadoop.hdfs.web.JsonUtil.toDatanodeInfoArray(JsonUtil.java:348)
at org.apache.hadoop.hdfs.web.JsonUtil.toLocatedBlock(JsonUtil.java:377)
at org.apache.hadoop.hdfs.web.JsonUtil.toLocatedBlockList(JsonUtil.java:413)
at org.apache.hadoop.hdfs.web.JsonUtil.toLocatedBlocks(JsonUtil.java:446)
at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileBlockLocations(WebHdfsFileSystem.java:1063)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1812)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1797)
{quote}

> WebHdfs client cannot communicate with older WebHdfs servers post HDFS-5306
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-5403
>                 URL: https://issues.apache.org/jira/browse/HDFS-5403
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 2.2.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>
> HDFS-5306 introduced the field infoSecurePort to the DatanodeIDProto PB definition and made it optional for compatibility purposes. However, we don't correctly the handle the case when this field is not present when deserializing the response from a WebHdfs request. This results in an NPE at the client when this occurs.



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