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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13331) Add lastSeenStateId to RpcRequestHeader.
Date Thu, 29 Mar 2018 19:54:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419655#comment-16419655
] 

Erik Krogen commented on HDFS-13331:
------------------------------------

Hey [~zero45], just looked through the most recent patch. I have a question about using a
static {{alignmentContext}} in {{Client}}. We can potentially have two {{DFSClient}} objects
in the same JVM which are communicating with completely difference namespaces, each of which
should have their own {{alignmentContext}}. The current implementation would not support this,
AFAICT. Am I correct? I don't think that is acceptable IIUC.

> Add lastSeenStateId to RpcRequestHeader.
> ----------------------------------------
>
>                 Key: HDFS-13331
>                 URL: https://issues.apache.org/jira/browse/HDFS-13331
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-12943
>            Reporter: Plamen Jeliazkov
>            Assignee: Plamen Jeliazkov
>            Priority: Major
>         Attachments: HDFS-13331-HDFS-12943.002.patch, HDFS-13331-HDFS-12943.003..patch,
HDFS-13331.trunk.001.patch, HDFS_13331.trunk.000.patch
>
>
> HDFS-12977 added a stateId into the RpcResponseHeader which is returned by NameNode and
stored by DFSClient.
> This JIRA is to followup on that work and have the DFSClient send their stored "lastSeenStateId"
in the RpcRequestHeader so that ObserverNodes can then compare with their own and act accordingly.
> This JIRA work focuses on just the part of making DFSClient send their state through
RpcRequestHeader.



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