hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1971) HA: Send block report from datanode to both active and standby namenodes
Date Mon, 22 Aug 2011 14:26:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088725#comment-13088725

Uma Maheswara Rao G commented on HDFS-1971:

Hi Sanjay,

Thanks for posting the document!.
Looks solution 1 will be good and simpler.

Here i have some questions.
  Assume one scenario, if DN contains a block and related file is not yet closed by client.
So, that block information may not be available in standby node. When we send the block reports
from DN to standby, it may give the command to DN as invalidates as that block information
is not avalible in standby. When it receives the invalidates command from standBy node,what
is the action in DN?
Whether we will ignore the block invalidate commands from standBy node?


> HA: Send block report from datanode to both active and standby namenodes
> ------------------------------------------------------------------------
>                 Key: HDFS-1971
>                 URL: https://issues.apache.org/jira/browse/HDFS-1971
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, name-node
>            Reporter: Suresh Srinivas
>            Assignee: Sanjay Radia
>         Attachments: DualBlockReports.pdf
> To enable hot standby namenode, the standby node must have current information for -
namenode state (image + edits) and block location information. This jira addresses keeping
the block location information current in the standby node. To do this, the proposed solution
is to send block reports from the datanodes to both the active and the standby namenode.

This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira


View raw message