[
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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
