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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-13743) RBF: Router throws NullPointerException due to the invalid initialization of MountTableResolver
Date Wed, 18 Jul 2018 17:03:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548090#comment-16548090
] 

Íñigo Goiri commented on HDFS-13743:
------------------------------------

Do you have an idea on why the MountTableResolver is not working?
In any case, we should add a null check and send and error mentioning  that the MountTableResolver
wasn't initialized properly.

> RBF: Router throws NullPointerException due to the invalid initialization of MountTableResolver
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-13743
>                 URL: https://issues.apache.org/jira/browse/HDFS-13743
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Takanobu Asanuma
>            Assignee: Takanobu Asanuma
>            Priority: Major
>
> When {{dfs.federation.router.default.nameserviceId}} isn't set and any other default
name service isn't found, clients can't submit requests to the router because of {{NullPointerException}}.
>  # client side
> {noformat}
> $ hadoop fs -ls hdfs://router:8888/
> ls: java.lang.NullPointerException
> {noformat}
>  # Router log
> {noformat}
> java.lang.NullPointerException
>         at java.util.TreeMap.getEntry(TreeMap.java:347)
>         at java.util.TreeMap.containsKey(TreeMap.java:232)
>         at java.util.TreeSet.contains(TreeSet.java:234)
>         at org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getLocationsForPath(RouterRpcServer.java:2287)
>         at org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getLocationsForPath(RouterRpcServer.java:2239)
>         at org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getFileInfo(RouterRpcServer.java:1163)
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:966)
>         at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025)
>         at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:876)
>         at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:822)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1689)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2682)
> {noformat}
> The cause of this error is that the initialization of {{MountTableResolver}} doesn't
work properly.



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