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From "Dinesh S. Atreya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9607) Advance Hadoop Architecture (AHA) - HDFS
Date Sun, 03 Jan 2016 18:58:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15080500#comment-15080500
] 

Dinesh S. Atreya commented on HDFS-9607:
----------------------------------------

This write feature proposal is a very restricted version of POSIX write capability to minimize
impacts to HDFS and yet provide comprehensive functionalities.
For example, following can be allowed: Replacing
{code}
"Hello World" 
{code}
by
{code}
 "Hello HDFS!" 
{code}, or {noformat}
 "Hello World" 
{noformat}
by
{noformat}
 "Hello: HDFS" 
{noformat}, or
{noformat} "Hello World" {noformat} by {noformat} "Hello  HDFS" {noformat} (with extra space
between Hello and HDFS), or
{noformat} "Hello World" {noformat} by {noformat}  "           " {noformat} (blank spaces
or any other *_padding_* instead of letters while maintaining length
Following are not allowed:
{noformat} "Hello World" {noformat} by {noformat} "Hello Hadoop" {noformat} (greater length),
and
{noformat} "Hello World"  {noformat} by {noformat} "Hello HDFS" {noformat} (shorter length)

Note: The term *_padding_* is used to account for cases in which *_encryption_* with associated
*_padding_* is used.

> Advance Hadoop Architecture (AHA) - HDFS
> ----------------------------------------
>
>                 Key: HDFS-9607
>                 URL: https://issues.apache.org/jira/browse/HDFS-9607
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Dinesh S. Atreya
>
> Link to Umbrella JIRA
> https://issues.apache.org/jira/browse/HADOOP-12620 
> Provide capability to carry out in-place writes/updates. Only writes in-place are supported
where the existing length does not change.
> For example, "Hello World" can be replaced by "Hello HDFS!"
> See https://issues.apache.org/jira/browse/HADOOP-12620?focusedCommentId=15046300&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15046300
for more details.



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