[HDFS-6475] WebHdfs clients fail without retry because incorrect handling of StandbyException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.5.0
• Component/s: ha, webhdfs
• Hadoop Flags: Reviewed
• Assignee: Yongjun Zhang
• Reporter: Yongjun Zhang
• Created: 01/Jun/14 18:57
• Updated: 15/Aug/14 05:41
• Resolved: 24/Jun/14 23:09

Description

With WebHdfs clients connected to a HA HDFS service, the delegation token is previously initialized with the active NN.

When clients try to issue request, the NN it contacts is stored in a map returned by DFSUtil.getNNServiceRpcAddresses(conf). And the client contact the NN based on the order, so likely the first one it runs into is StandbyNN. If the StandbyNN doesn't have the updated client crediential, it will throw a s SecurityException that wraps StandbyException.

The client is expected to retry another NN, but due to the insufficient handling of SecurityException mentioned above, it failed.

Example message:

{RemoteException={message=Failed to obtain user group information: org.apache.hadoop.security.token.SecretManager$InvalidToken: StandbyException, javaCl
assName=java.lang.SecurityException, exception=SecurityException}}

org.apache.hadoop.ipc.RemoteException(java.lang.SecurityException): Failed to obtain user group information: org.apache.hadoop.security.token.SecretManager$InvalidToken: StandbyException
        at org.apache.hadoop.hdfs.web.JsonUtil.toRemoteException(JsonUtil.java:159)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:325)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$700(WebHdfsFileSystem.java:107)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.getResponse(WebHdfsFileSystem.java:635)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:542)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.run(WebHdfsFileSystem.java:431)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHdfsFileStatus(WebHdfsFileSystem.java:685)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileStatus(WebHdfsFileSystem.java:696)
        at kclient1.kclient$1.run(kclient.java:64)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:356)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1528)
        at kclient1.kclient.main(kclient.java:58)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:212)