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Posted to hdfs-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2017/12/05 00:18:00 UTC

[jira] [Updated] (HDFS-11313) Segmented Block Reports

     [ https://issues.apache.org/jira/browse/HDFS-11313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko updated HDFS-11313:
---------------------------------------
    Target Version/s:   (was: 2.7.5)

> Segmented Block Reports
> -----------------------
>
>                 Key: HDFS-11313
>                 URL: https://issues.apache.org/jira/browse/HDFS-11313
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, namenode
>    Affects Versions: 2.6.2
>            Reporter: Konstantin Shvachko
>            Assignee: Vinitha Reddy Gankidi
>         Attachments: SegmentedBlockReports.pdf
>
>
> Block reports from a single DataNode can be currently split into multiple RPCs each reporting a single DataNode storage (disk). The reports are still large since disks are getting bigger. Splitting blockReport RPCs into multiple smaller calls would improve NameNode performance and overall HDFS stability.
> This was discussed in multiple jiras. Here the approach is to let NameNode divide blockID space into segments and then ask DataNodes to report replicas in a particular range of IDs.



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