[HDFS-6450] Support non-positional hedged reads in HDFS

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.4.0
• Assignee: Liang Xie
• Reporter: Colin McCabe
• Created: 27/May/14 20:14
• Updated: 20/Sep/17 16:52

Description

HDFS-5776 added support for hedged positional reads. We should also support hedged non-position reads (aka regular reads).

Issue Links

• is depended upon by: HDFS-6286 adding a timeout setting for local read io
• is related to: HDFS-7782 Erasure coding: pread from files in striped layout
• is related to: HDFS-5776 Support 'hedged' reads in DFSClient
• relates to: HDFS-97 DFS should detect slow links(nodes) and avoid them
• relates to: HDFS-12514 Cancelled HedgedReads cause block to be marked as suspect on Windows
• supercedes: HDFS-6286 adding a timeout setting for local read io