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Posted to hdfs-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2017/01/11 01:56:58 UTC
[jira] [Updated] (HDFS-9657) Schedule EC tasks at proper time to
reduce the impact of recovery traffic
[ https://issues.apache.org/jira/browse/HDFS-9657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Wang updated HDFS-9657:
------------------------------
Labels: hdfs-ec-3.0-nice-to-have (was: )
> 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: Sub-task
> Reporter: Li Bo
> Assignee: 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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