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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12256) Ozone : handle inactive containers on DataNode
Date Thu, 14 Sep 2017 19:47:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16166876#comment-16166876

Chen Liang commented on HDFS-12256:

The failed tests are unrelated.

> Ozone : handle inactive containers on DataNode
> ----------------------------------------------
>                 Key: HDFS-12256
>                 URL: https://issues.apache.org/jira/browse/HDFS-12256
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>              Labels: ozoneMerge, tocheck
>         Attachments: HDFS-12256-HDFS-7240.001.patch
> When a container gets created, corresponding metadata gets added to {{ContainerManagerImpl#containerMap}}.
What {{containerMap}} stores is a containerName to {{ContainerStatus}} instance map. When
datanode starts, it also loads this map from disk file metadata. As long as the containerName
is found in this map, it is considered an existing container.
> An issue we saw was that, occasionally, when the container creation on datanode fails,
the metadata of the failed container may still get added to {{containerMap}}, with active
flag set to false. But currently such containers are not being handled, containers with active=false
are just treated as normal containers. Then when someone tries to write to this container,
fails can happen.

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