Takanobu Asanuma created HDFS-13743:
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Summary: 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
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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