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From "Akira Ajisaka (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-16899) Update HdfsDesign.md to reduce ambiguity
Date Wed, 04 Mar 2020 02:14:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-16899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Akira Ajisaka resolved HADOOP-16899.
    Fix Version/s: 3.2.2
     Hadoop Flags: Reviewed
       Resolution: Fixed

Merged the PR into trunk and branch-3.2. Thanks [~invincible-akshay] for your contribution!

> Update HdfsDesign.md to reduce ambiguity
> ----------------------------------------
>                 Key: HADOOP-16899
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16899
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Akshay Nehe
>            Assignee: Akshay Nehe
>            Priority: Minor
>             Fix For: 3.3.0, 3.2.2
> A proposed update to [https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md|http://example.com/] in
the section "Replica Placement: The First Baby Steps" 4th paragraph, 2nd last line.
> The sentence is leading to ambiguity of reader.
> Considering the statement segmented in 3 parts by the commas:
>  # the first part talks about "one thirds of replicas";
>  # the second part talks about "two thirds of replicas"
>  # the third part talking about "the other third" is leading to ambiguity when one thirds
and two thirds have already accounted for the whole.
> Proposed solution:
> Getting rid of the third part or rephrasing entire sentence to capture the overall essence
of the sentence.
> In other words, replacing 
> _One third of replicas are on one node, two thirds of replicas are on one rack, and the
other third are evenly distributed across the remaining racks._
> with
> -_One third of replicas are on one node, two thirds of replicas are on one rack._-
> {quote}{{Two replicas are on different nodes of one rack and the remaining replica is
on a node of one of the other racks.}}
> {quote}
> In addition to this, found 2 more sentences in same paragraph that will be corrected.
> 1.
> {quote}However, it does reduce the aggregate network bandwidth used when reading data
since a block is placed in only two unique racks rather than three.
> {quote}
> will replace: does reduce -> does not reduce
> 2. 
> {quote}With this policy, the replicas of a file do not evenly distribute across the racks.
> {quote}
> will replace: replicas of a file -> replicas of a block 
> Please suggest if any additional meaning is getting lost with this replacement.

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