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https://issues.apache.org/jira/browse/HDFS-14422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815725#comment-16815725
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Ayush Saxena commented on HDFS-14422:
-------------------------------------
Thanx [~elgoiri] for the patch, The fix seems quite straightforward,
I guess the state of the router is independent of the actual namespaces, It has
its safemode state independent of the nameservice, so by router safemode state
we can't judge that operation shall be honored by namenode or not. So that
check shall not be of any use for the purpose to check the namenode response.
Now after the change, If the router is in safemode it shall not honor any
request, isn't it? Wouldn't it be safemode like turning the router off?
Presently we can switch router to safemode to make it honor all read request
but stop writes? Will that ability go away?
> RBF: Router shouldn't allow READ operations in safe mode
> --------------------------------------------------------
>
> Key: HDFS-14422
> URL: https://issues.apache.org/jira/browse/HDFS-14422
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Íñigo Goiri
> Assignee: Íñigo Goiri
> Priority: Major
> Attachments: HDFS-14422-HDFS-13891.000.patch
>
>
> We are currently seeing:
> org.apache.hadoop.hdfs.server.federation.store.StateStoreUnavailableException:
> Mount Table not initialized
> at
> org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver.verifyMountTable(MountTableResolver.java:521)
> at
> org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver.getDestinationForPath(MountTableResolver.java:394)
> at
> org.apache.hadoop.hdfs.server.federation.resolver.MultipleDestinationMountTableResolver.getDestinationForPath(MultipleDestinationMountTableResolver.java:87)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getLocationsForPath(RouterRpcServer.java:1258)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterClientProtocol.getFileInfo(RouterClientProtocol.java:747)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getFileInfo(RouterRpcServer.java:749)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:881)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:513)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1011)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:871)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:817)
> 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:1915)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2621)
> The Namenode allows READ operations but for the Router not being able to
> access the State Store also hits the read operations.
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