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Posted to hdfs-issues@hadoop.apache.org by "Íñigo Goiri (JIRA)" <ji...@apache.org> on 2018/08/03 16:25:00 UTC
[jira] [Commented] (HDFS-13088) Allow HDFS files/blocks to be
over-replicated.
[ https://issues.apache.org/jira/browse/HDFS-13088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568438#comment-16568438 ]
Íñigo Goiri commented on HDFS-13088:
------------------------------------
I think that adding overreplication as a default of 0 to setReplication makes sense.
However, I'm in between changing the method or adding an extra one with the new parameter.
The current approach in [^HDFS-13088.001.patch] adds the parameter and changes all the other tests.
Maybe we should add a new method instead of changing the existing one.
> Allow HDFS files/blocks to be over-replicated.
> ----------------------------------------------
>
> Key: HDFS-13088
> URL: https://issues.apache.org/jira/browse/HDFS-13088
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Priority: Major
> Attachments: HDFS-13088.001.patch
>
>
> This JIRA is to add a per-file "over-replication" factor to HDFS. As mentioned in HDFS-13069, the over-replication factor will be the excess replicas that will be allowed to exist for a file or block. This is beneficial if the application deems additional replicas for a file are needed. In the case of HDFS-13069, it would allow copies of data in PROVIDED storage to be cached locally in HDFS in a read-through manner.
> The Namenode will not proactively meet the over-replication i.e., it does not schedule replications if the number of replicas for a block is less than (replication factor + over-replication factor) as long as they are more than the replication factor of the file.
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