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https://issues.apache.org/jira/browse/HDFS-2465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-2465:
------------------------------
Resolution: Fixed
Fix Version/s: 0.23.0
Release Note:
HDFS now has the ability to use posix_fadvise and sync_data_range syscalls to
manage the OS buffer cache. This support is currently considered experimental,
and may be enabled by configuring the following keys:
dfs.datanode.drop.cache.behind.writes - set to true to drop data out of the
buffer cache after writing
dfs.datanode.drop.cache.behind.reads - set to true to drop data out of the
buffer cache when performing sequential reads
dfs.datanode.sync.behind.writes - set to true to trigger dirty page writeback
immediately after writing data
dfs.datanode.readahead.bytes - set to a non-zero value to trigger readahead for
sequential reads
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Committed to trunk and 23. Thanks for the review, Eli.
> 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
> Fix For: 0.23.0
>
> 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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