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Posted to common-issues@hadoop.apache.org by "Akshay Nehe (Jira)" <ji...@apache.org> on 2020/03/03 03:36:00 UTC
[jira] [Commented] (HADOOP-16899) Update HdfsDesign.md to reduce
ambiguity
[ https://issues.apache.org/jira/browse/HADOOP-16899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049868#comment-17049868 ]
Akshay Nehe commented on HADOOP-16899:
--------------------------------------
Based on comment by [~aajisaka] on the PR, considering replacing the line with:
_Two replicas are on one rack, and the remaining replica is on one of the other racks._
instead of previously indicated update.
An additional recommended update will be included for the sentence 2 sentences before the previously mentioned.
Quoting Akira:
The following sentence is not directly related to your PR, however, it can be fixed at the same time.
{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. With this policy, the replicas of a file do not evenly distribute across the racks.
{quote} * it does reduce -> it does not reduce
If a block is placed in three unique racks, the probability of rack-local read will increase and the network bandwidth will be reduced when reading the data. Therefore I think 'does' should be changed to 'does not'.
Once decided to make both changes, will update the Jira Description.
> 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
> Priority: Minor
>
> 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._
> Please suggest if any additional meaning is getting lost with this replacement.
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