[
https://issues.apache.org/jira/browse/HADOOP-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12518296
]
Konstantin Shvachko commented on HADOOP-1649:
---------------------------------------------
# SMALL_HDR_BUFFER_SIZE not used any more
# "randomAccessFile" and "in" variables in DFSClient.sendBlcok() are related
that is point to the same file.
It would be good if they had something similar in their names like blockFile
and blockFileIn, etc.
# Does not look like we gain a lot with buffering, so lets make sure memory
costs are minimized.
> Performance regression with Block CRCs
> --------------------------------------
>
> Key: HADOOP-1649
> URL: https://issues.apache.org/jira/browse/HADOOP-1649
> Project: Hadoop
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Priority: Blocker
> Fix For: 0.14.0
>
> Attachments: HADOOP-1649.patch, HADOOP-1649.patch
>
>
> Performance is noticeably affected by Block Level CRCs patch (HADOOP-1134).
> This is more noticeable on writes (randomriter test etc).
> With random writer, it takes 20-25% on small cluster (20 nodes) and many be
> 10% on larger cluster.
> There are a few differences in how data is written with 1134. As soon as I
> can reproduce this, I think it will be easier to fix.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
