[
https://issues.apache.org/jira/browse/HADOOP-5724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Suresh Srinivas updated HADOOP-5724:
------------------------------------
Release Note:
* When a file is deleted, the corresponding blocks from the blocksMap on
Namenode is also deleted
* Block reports from datanode was a way to indicate deletion of block to the
namenode. With this change namenode no longer depends on the block report.
Hence reducing the frequency of block reports by increasing the block report
interval from current 1 hour to 6 hours.
Status: Patch Available (was: Open)
> Datanode should report deletion of blocks to Namenode explicitly
> ----------------------------------------------------------------
>
> Key: HADOOP-5724
> URL: https://issues.apache.org/jira/browse/HADOOP-5724
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: 0.21.0
>
> Attachments: blockdel-1.patch, blockdel-2.patch, blockdel.patch,
> blockdel.patch
>
>
> Currently datanode notifies namenode newly added blocks and the blocks that
> are corrupt. There is no explicit message from the datanode to the namenode
> to indicate the deletion of blocks. Block reports from the datanode is the
> only way for the namenode to learn about the deletion of blocks at a
> datanode. With the addition of explicit request to indicate to block
> deletion, block report interval (which is currently 1 hour) can be increased
> to a longer duration. This reduces load on both namenode and datanodes.
>
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
