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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5590) Block ID and generation stamp may be reused when persistBlocks is set to false
Date Wed, 04 Dec 2013 00:29:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838387#comment-13838387

Konstantin Shvachko commented on HDFS-5590:

> deprecating the property is also fine.

Jing, looks like you completely removed the opportunity to not persist blocks.
Doesn't look like deprecation to me.

> Block ID and generation stamp may be reused when persistBlocks is set to false
> ------------------------------------------------------------------------------
>                 Key: HDFS-5590
>                 URL: https://issues.apache.org/jira/browse/HDFS-5590
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5590.000.patch, HDFS-5590.001.patch
> In a cluster with non-HA setup and dfs.persist.blocks set to false, we may have data
loss in the following case:
> # client creates file1 and requests a block from NN and get blk_id1_gs1
> # client writes blk_id1_gs1 to DN
> # NN is restarted and because persistBlocks is false, blk_id1_gs1 may not be persisted
in disk
> # another client creates file2 and NN will allocate a new block using the same block
id blk_id1_gs1 since block ID and generation stamp are both increased sequentially.
> Now we may have two versions (file1 and file2) of the blk_id1_gs1 (same id, same gs)
in the system. It will case data loss.

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