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https://issues.apache.org/jira/browse/HDFS-13040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-13040:
-----------------------------
Attachment: HDFS-13040.02.patch
> Kerberized inotify client fails despite kinit properly
> ------------------------------------------------------
>
> Key: HDFS-13040
> URL: https://issues.apache.org/jira/browse/HDFS-13040
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Environment: Kerberized, HA cluster, iNotify client, CDH5.10.2
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Attachments: HDFS-13040.001.patch, HDFS-13040.02.patch,
> TestDFSInotifyEventInputStreamKerberized.java, TransactionReader.java
>
>
> This issue is similar to HDFS-10799.
> HDFS-10799 turned out to be a client side issue where client is responsible
> for renewing kerberos ticket actively.
> However we found in a slightly setup even if client has valid Kerberos
> credentials, inotify still fails.
> Suppose client uses principal h...@example.com,
> namenode 1 uses server principal hdfs/nn1.example....@example.com
> namenode 2 uses server principal hdfs/nn2.example....@example.com
> *After Namenodes starts for longer than kerberos ticket lifetime*, the client
> fails with the following error:
> {noformat}
> 18/01/19 11:23:02 WARN security.UserGroupInformation:
> PriviledgedActionException as:h...@gce.cloudera.com (auth:KERBEROS)
> cause:org.apache.hadoop.ipc.RemoteException(java.io.IOException): We
> encountered an error reading
> https://nn2.example.com:8481/getJournal?jid=ns1&segmentTxId=8662&storageInfo=-60%3A353531113%3A0%3Acluster3,
>
> https://nn1.example.com:8481/getJournal?jid=ns1&segmentTxId=8662&storageInfo=-60%3A353531113%3A0%3Acluster3.
> During automatic edit log failover, we noticed that all of the remaining
> edit log streams are shorter than the current one! The best remaining edit
> log ends at transaction 8683, but we thought we could read up to transaction
> 8684. If you continue, metadata will be lost forever!
> at
> org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream.nextOp(RedundantEditLogInputStream.java:213)
> at
> org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:85)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.readOp(NameNodeRpcServer.java:1701)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getEditsFromTxid(NameNodeRpcServer.java:1763)
> at
> org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.getEditsFromTxid(AuthorizationProviderProxyClientProtocol.java:1011)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getEditsFromTxid(ClientNamenodeProtocolServerSideTranslatorPB.java:1490)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2216)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2212)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1920)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2210)
> {noformat}
> Typically if NameNode has an expired Kerberos ticket, the error handling for
> the typical edit log tailing would let NameNode to relogin with its own
> Kerberos principal. However, when inotify uses the same code path to retrieve
> edits, since the current user is the inotify client's principal, unless
> client uses the same principal as the NameNode, NameNode can't do it on
> behalf of the client.
> Therefore, a more appropriate approach is to use proxy user so that NameNode
> can retrieving edits on behalf of the client.
> I will attach a patch to fix it. This patch has been verified to work for a
> CDH5.10.2 cluster, however it seems impossible to craft a unit test for this
> fix because the way Hadoop UGI handles Kerberos credentials (I can't have a
> single process that logins as two Kerberos principals simultaneously and let
> them establish connection)
> A possible workaround is for the inotify client to use the active NameNode's
> server principal. However, that's not going to work when there's a namenode
> failover, because then the client's principal will not be consistent with the
> active NN's one, and then fails to authenticate.
> Credit: this bug was confirmed and reproduced by [~pifta] and [~r1pp3rj4ck]
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