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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9657) Schedule EC tasks at proper time to reduce the impact of recovery traffic
Date Fri, 01 Sep 2017 00:48:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Wang updated HDFS-9657:
------------------------------
    Issue Type: Improvement  (was: Bug)

> Schedule EC tasks at proper time to reduce the impact of recovery traffic
> -------------------------------------------------------------------------
>
>                 Key: HDFS-9657
>                 URL: https://issues.apache.org/jira/browse/HDFS-9657
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: erasure-coding
>            Reporter: Li Bo
>              Labels: hdfs-ec-3.0-nice-to-have
>         Attachments: HDFS-9657-001.patch, HDFS-9657-002.patch
>
>
> The EC recover tasks consume a lot of network bandwidth and disk I/O. Recovering a corrupt
block requires transferring 6 blocks , hence creating a 6X overhead in network bandwidth and
disk I/O.  When a datanode fails , the recovery of the whole blocks on this datanode may use
up the network bandwith.  We need to start a recovery task at a proper time in order to give
less impact to the system.



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