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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6581) Write to single replica in memory
Date Fri, 19 Sep 2014 17:29:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140926#comment-14140926
] 

Suresh Srinivas commented on HDFS-6581:
---------------------------------------

bq. I also think we absolutely need a better eviction strategy than LRU before merging. Any
kind of real-world workload will probably show this really clearly.
I agree with the need for better eviction strategy. This will be driven off of applications
that use this functionality. But I disagree that we need "better strategy" before the merge.

[~arpitagarwal], is the eviction strategy pluggable and easy to change. If it is so, it should
not hold off from merging this change.

> Write to single replica in memory
> ---------------------------------
>
>                 Key: HDFS-6581
>                 URL: https://issues.apache.org/jira/browse/HDFS-6581
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-6581.merge.01.patch, HDFS-6581.merge.02.patch, HDFS-6581.merge.03.patch,
HDFS-6581.merge.04.patch, HDFS-6581.merge.05.patch, HDFS-6581.merge.06.patch, HDFSWriteableReplicasInMemory.pdf,
Test-Plan-for-HDFS-6581-Memory-Storage.pdf
>
>
> Per discussion with the community on HDFS-5851, we will implement writing to a single
replica in DN memory via DataTransferProtocol.
> This avoids some of the issues with short-circuit writes, which we can revisit at a later
time.



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