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From "Dinesh S. Atreya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9607) Advance Hadoop Architecture (AHA) - HDFS
Date Thu, 07 Jan 2016 01:59:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086662#comment-15086662
] 

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

Both [~stevel@apache.org] and [~wheat9] have raised good points. 

Can only work on the design doc during spare time. 

Don't want to have semantics of "update" too different from "append". Kindly indicate what
are the semantics of "append" vis-a-vis above, if folks know and remember. (in-parallel I
will dig that information up).

As a start we will reuse the [Generation Stamp | https://issues.apache.org/jira/secure/attachment/12370562/Appends.doc]
of blocks from the Append effort.



> 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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