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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11154) Block Storage : store server state to persistent storage
Date Tue, 22 Nov 2016 23:39:58 GMT

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

Chen Liang updated HDFS-11154:
------------------------------
    Attachment: HDFS-11154-HDFS-7240.007.patch

Fix the checkstyle warning

> 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
>         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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