[
https://issues.apache.org/jira/browse/HADOOP-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564510#action_12564510
]
Raghu Angadi commented on HADOOP-2154:
--------------------------------------
I chatted with Eric and Konstantin. I think we are on the same page now.
Essentially this jira will reduce memory (buffer) copies by rearranging how
data is read/written to/from sockets/disk.
I filed a follow up jira HADOOP-2758 for DFS read side. Read path is much
simpler and I can work on write part while we are evaluating good or bad
affects of HADOOP-2758.
> Non-interleaved checksums would optimize block transfers.
> ---------------------------------------------------------
>
> Key: HADOOP-2154
> URL: https://issues.apache.org/jira/browse/HADOOP-2154
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.14.0
> Reporter: Konstantin Shvachko
> Assignee: Raghu Angadi
>
> Currently when a block is transfered to a data-node the client interleaves
> data chunks with the respective checksums.
> This requires creating an extra copy of the original data in a new buffer
> interleaved with the crcs.
> We can avoid extra copying if the data and the crc are fed to the socket one
> after another.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
