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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10441) libhdfs++: HA namenode support
Date Tue, 21 Jun 2016 20:02:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

James Clampffer updated HDFS-10441:
    Attachment: HDFS-10441.HDFS-8707.005.patch

New patch:
-can take a nameservice in FileSystem::Connect
-got rid of distinct enum for server exception types
-prepend hdfs:// to namenode authorities to use URI class
-fix bug in default option: max retries defaults to -1, would get cast to uint64_t and get
stuck doing retries
-rename FmtURI method
-added status strings to some error messages, still a few more to go
-follow the <some method>_locked naming convention
-read HA options from config and use them in the retry policy
-support for connection timeout during connection to a HA node: default to immediate failover

Outstanding work:
-still need to move stuff out of the hdfs_configuration class
-get rid of duplicate data structures in options (services, ha_enabled_, ha_namenodes_) and
just keep Options::services.  This one is trickier than it sounds; to do it right we either
need to resolve endpoints for the HA namenodes in filesystem, or pass the namenode/nameservices
down to the RPC engine and do DNS lookup there (instead of twice).  It spans enough of the
code that I spend a good amount of time resolving merge conflicts so I'd like to do these
changes in another JIRA if others thing that is acceptable.  A proper refactor of this will
fix a few issues:
1) better looking code
2) full support for multiple HA clusters
3) get rid of extra level of DNS lookup

-still some minor cleanup

> libhdfs++: HA namenode support
> ------------------------------
>                 Key: HDFS-10441
>                 URL: https://issues.apache.org/jira/browse/HDFS-10441
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-10441.HDFS-8707.000.patch, HDFS-10441.HDFS-8707.002.patch,
HDFS-10441.HDFS-8707.003.patch, HDFS-10441.HDFS-8707.004.patch, HDFS-10441.HDFS-8707.005.patch,
> If a cluster is HA enabled then do proper failover.

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