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https://issues.apache.org/jira/browse/HDFS-11154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15688543#comment-15688543
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Anu Engineer commented on HDFS-11154:
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+1, I will commit this shortly.
> 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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