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Yongjun Zhang commented on HADOOP-14445: ---------------------------------------- Thanks [~daryn]. When I say it's unavoidable, I mean, if we use a nameservice, we need to consult the config to know what's associated with the nameservice. For example NN nameservice, if we do "distcp hdfs://nameservice1:/xyz hdfs://nameservice2:/abc", we need to look up nameservice1/2 in config, to know the associated NNs. Similarly, if we use shared delegation token for all KMS servers, we could define a kms-nameservice to associate with the set of KMS servers, and the tokenService can just be the kms-nameservice, and from the config, we can find out the associated KMS server information. Does that make sense? > Delegation tokens are not shared between KMS instances > ------------------------------------------------------ > > Key: HADOOP-14445 > URL: https://issues.apache.org/jira/browse/HADOOP-14445 > Project: Hadoop Common > Issue Type: Bug > Components: documentation, kms > Affects Versions: 2.8.0, 3.0.0-alpha1 > Reporter: Wei-Chiu Chuang > Assignee: Rushabh S Shah > Attachments: HADOOP-14445-branch-2.8.patch > > > As discovered in HADOOP-14441, KMS HA using LoadBalancingKMSClientProvider do > not share delegation tokens. (a client uses KMS address/port as the key for > delegation token) > {code:title=DelegationTokenAuthenticatedURL#openConnection} > if (!creds.getAllTokens().isEmpty()) { > InetSocketAddress serviceAddr = new InetSocketAddress(url.getHost(), > url.getPort()); > Text service = SecurityUtil.buildTokenService(serviceAddr); > dToken = creds.getToken(service); > {code} > But KMS doc states: > {quote} > Delegation Tokens > Similar to HTTP authentication, KMS uses Hadoop Authentication for delegation > tokens too. > Under HA, A KMS instance must verify the delegation token given by another > KMS instance, by checking the shared secret used to sign the delegation > token. To do this, all KMS instances must be able to retrieve the shared > secret from ZooKeeper. > {quote} > We should either update the KMS documentation, or fix this code to share > delegation tokens. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org