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