[HDFS-2744] Extend FSDataInputStream to allow fadvise

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: hdfs-client
• Labels: performance
• Assignee: Dhruba Borthakur
• Reporter: Dhruba Borthakur
• Created: 03/Jan/12 20:51
• Updated: 13/Feb/18 22:13

Description

Now that we have direct reads from local HDFS block files (HDFS-2246), it might make sense to make FSDataInputStream support fadvise calls. I have an application (HBase) that would like to tell the OS that it should not buffer data in the OS buffer cache.

Issue Links

• is related to: HADOOP-15229 Add FileSystem builder-based openFile() API to match createFile(); S3A to implement S3 Select through this API.
• relates to: HADOOP-13203 S3A: Support fadvise "random" mode for high performance readPositioned() reads
• relates to: HDFS-3228 Use fadvise in local read path