[ https://issues.apache.org/jira/browse/HDFS-14017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677496#comment-16677496 ]
Chen Liang commented on HDFS-14017: ----------------------------------- Thanks for the review [~xkrogen]! Post v005 patch. bq. Seems like there is some duplication... Thanks for the suggestion! Made the change as you suggested. bq. Do you have a plan to The keys in {{addressList}} are name service names. So the question I had here was that when there are multiple name services, which delegation token should the client clone for each name service / how client can tie the VIP to the different name services. I think it would be more clear after we have a more holistic idea on how Observer read clients interact with multiple name services. > ObserverReadProxyProviderWithIPFailover should work with HA configuration > ------------------------------------------------------------------------- > > Key: HDFS-14017 > URL: https://issues.apache.org/jira/browse/HDFS-14017 > Project: Hadoop HDFS > Issue Type: Sub-task > Reporter: Chen Liang > Assignee: Chen Liang > Priority: Major > Attachments: HDFS-14017-HDFS-12943.001.patch, > HDFS-14017-HDFS-12943.002.patch, HDFS-14017-HDFS-12943.003.patch, > HDFS-14017-HDFS-12943.004.patch, HDFS-14017-HDFS-12943.005.patch > > > Currently {{ObserverReadProxyProviderWithIPFailover}} extends > {{ObserverReadProxyProvider}}, and the only difference is changing the proxy > factory to use {{IPFailoverProxyProvider}}. However this is not enough > because when calling constructor of {{ObserverReadProxyProvider}} in > super(...), the follow line: > {code:java} > nameNodeProxies = getProxyAddresses(uri, > HdfsClientConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY); > {code} > will try to resolve the all configured NN addresses to do configured > failover. But in the case of IPFailover, this does not really apply. > > A second issue closely related is about delegation token. For example, in > current IPFailover setup, say we have a virtual host nn.xyz.com, which points > to either of two physical nodes nn1.xyz.com or nn2.xyz.com. In current HDFS, > there is always only one DT being exchanged, which has hostname nn.xyz.com. > Server only issues this DT, and client only knows the host nn.xyz.com, so all > is good. But in Observer read, even with IPFailover, the client will no > longer contacting nn.xyz.com, but will actively reaching to nn1.xyz.com and > nn2.xyz.com. During this process, current code will look for DT associated > with hostname nn1.xyz.com or nn2.xyz.com, which is different from the DT > given by NN. causing Token authentication to fail. This happens in > {{AbstractDelegationTokenSelector#selectToken}}. New IPFailover proxy > provider will need to resolve this as well. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org