[
https://issues.apache.org/jira/browse/HDFS-12482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lei (Eddy) Xu updated HDFS-12482:
---------------------------------
Attachment: HDFS-12482.01.patch
Thanks for the reviews, [~andrew.wang]
Updated the patch to add documents. Empirically, an value between {{(0, 1.0]}}
seems can achieve similar recovery speed and network / cpu overhead between
replicated blocks and ec block recovery _on my testing cluster_. But it highly
depends on HW. I will set this value to {{0.5}} initially in this patch.
> Provide a configuration to adjust the weight of EC recovery tasks to adjust
> the speed of recovery
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-12482
> URL: https://issues.apache.org/jira/browse/HDFS-12482
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha4
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Priority: Minor
> Labels: hdfs-ec-3.0-nice-to-have
> Attachments: HDFS-12482.00.patch, HDFS-12482.01.patch
>
>
> The relative speed of EC recovery comparing to 3x replica recovery is a
> function of (EC codec, number of sources, NIC speed, and CPU speed, and etc).
> Currently the EC recovery has a fixed {{xmitsInProgress}} of {{max(# of
> sources, # of targets)}} comparing to {{1}} for 3x replica recovery, and NN
> uses {{xmitsInProgress}} to decide how much recovery tasks to schedule to the
> DataNode this we can add a coefficient for user to tune the weight of EC
> recovery tasks.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
