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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11154) Block Storage : store server state to persistent storage
Date Wed, 23 Nov 2016 01:52:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anu Engineer updated HDFS-11154:
--------------------------------
          Resolution: Fixed
        Hadoop Flags: Reviewed
       Fix Version/s: HDFS-7240
    Target Version/s: HDFS-7240
              Status: Resolved  (was: Patch Available)

[~vagarychen] Thanks for contributing the patch. I have committed this to the ozone branch.

> Block Storage : store server state to persistent storage
> --------------------------------------------------------
>
>                 Key: HDFS-11154
>                 URL: https://issues.apache.org/jira/browse/HDFS-11154
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-11154-HDFS-7240.001.patch, HDFS-11154-HDFS-7240.002.patch,
HDFS-11154-HDFS-7240.003.patch, HDFS-11154-HDFS-7240.004.patch, HDFS-11154-HDFS-7240.005.patch,
HDFS-11154-HDFS-7240.005.patch, HDFS-11154-HDFS-7240.006.patch, HDFS-11154-HDFS-7240.007.patch
>
>
> Currently, all the storage state are kept in server memory. If server crashes, we would
lose all the volume information. This JIRA stores server internal state into its local disk.
Such that on server failure, we can simply restart server and restore volume information from
disk.
> More specifically, the internal state written to disk is mainly the mapping from volume
to its underlying containers, plus some meta information such as volume size, block size,
etc.
> Note that this is only a simple, minimum set mechanism for persistence. It is more like
a counterpart of fsimage in HDFS, but without edit logs.



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