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https://issues.apache.org/jira/browse/HDFS-2465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138745#comment-13138745
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Todd Lipcon commented on HDFS-2465:
-----------------------------------
Failing tests seem unrelated. I ran the webhdfs tests locally and they passed.
TestHDFSCLI fails on my local box, but does so on trunk as well for me.
bq. -1 tests included. The patch doesn't appear to include any new or modified
tests.
Unfortunately it's not really possible to unit test this. I ran through several
terasorts on a small test cluster with this patch and verified that it helps
performance and didn't cause stability issues. I've been testing with very
similar patches for a couple weeks and seen no issues. It also is
off-by-default.
Given Eli gave a +1 earlier, I will wait a few hours and commit this if there
are no further comments.
> Add HDFS support for fadvise readahead and drop-behind
> ------------------------------------------------------
>
> Key: HDFS-2465
> URL: https://issues.apache.org/jira/browse/HDFS-2465
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, performance
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-2465.txt, hdfs-2465.txt, hdfs-2465.txt,
> hdfs-2465.txt
>
>
> This is the HDFS side of HADOOP-7714. The initial implementation is heuristic
> based and should be considered experimental, as discussed in the parent JIRA.
> It should be off by default until better heuristics, APIs, and tuning
> experience is developed.
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