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Date: Thu, 17 Nov 2016 23:06:58 +0000 (UTC)
From: "Chen Liang (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.13021618.1479424000000.308358.1479424018357@Atlassian.JIRA>
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Subject: [jira] [Created] (HDFS-11154) Block Storage : store server state to
 persistent storage
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archived-at: Thu, 17 Nov 2016 23:07:00 -0000

Chen Liang created HDFS-11154:
---------------------------------

             Summary: 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
            Reporter: Chen Liang
            Assignee: Chen Liang


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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