[
https://issues.apache.org/jira/browse/HDFS-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hairong Kuang updated HDFS-1368:
--------------------------------
Attachment: blockCounter.patch
This is a simple patch that adds a block counter to DatanodeDescriptor. It adds
a test case that check if the counter is set corrently.
> Add a block counter to DatanodeDescriptor
> -----------------------------------------
>
> Key: HDFS-1368
> URL: https://issues.apache.org/jira/browse/HDFS-1368
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.22.0
>
> Attachments: blockCounter.patch
>
>
> Many of time, we need to count the total number of blocks in a datanode by
> calling DatanodeDescriptor#numBlocks(). It has to traverse the block list to
> get the counter, which may not be trivial if there are millions of blocks.
> Adding a counter for each datanode does not cost much space but help save CPU
> processing time.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
