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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8356) Document missing properties in hdfs-default.xml
Date Wed, 09 Mar 2016 13:34:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187092#comment-15187092

Akira AJISAKA commented on HDFS-8356:

Reviewed to "dfs.ha.fencing.methods".
# "dfs.datanode.min.supported.namenode.version" and "dfs.datanode.startup" are not supposed
to be configured by users, so we can remove them from hdfs-default.xml.
# In "dfs.datanode.oob.timeout-ms", we should document that OOB types are OOB_RESTART, OOB_RESERVED1,
OOB_RESERVED2, and OOB_RESERVED3, and now only OOB_RESTART is used.
# In "dfs.datanode.parallel.volumes.load.threads.num", would you document that the default
value is the number of storages in the DataNode?
# In "dfs.datanode.socket.write.timeout", we should document that the parameter is valid for
DataNodes, not for DFSClient.
# Would you document that "dfs.datanode.sync.behind.writes.in.background" is valid only when
"dfs.datanode.sync.behind.writes" is set to true?
# In "dfs.datanode.transferTo.allowed", I'm thinking "If true" should be "If false".
# Would you remove unnecessarily whitespace in "m achine" in the description of "dfs.datanode.transferTo.allowed"?
# In "dfs.ha.fencing.methods", we can document that 
the parameter is well-documented in HDFS-HA doc, as well as "dfs.client.failover.proxy.provider".

> Document missing properties in hdfs-default.xml
> -----------------------------------------------
>                 Key: HDFS-8356
>                 URL: https://issues.apache.org/jira/browse/HDFS-8356
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.7.0
>            Reporter: Ray Chiang
>            Assignee: Ray Chiang
>              Labels: supportability, test
>         Attachments: HDFS-8356.001.patch, HDFS-8356.002.patch, HDFS-8356.003.patch, HDFS-8356.004.patch,
HDFS-8356.005.patch, HDFS-8356.006.patch
> The following properties are currently not defined in hdfs-default.xml. These properties
should either be
> A) documented in hdfs-default.xml OR
> B) listed as an exception (with comments, e.g. for internal use) in the TestHdfsConfigFields
unit test

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