[HDFS-12514] Cancelled HedgedReads cause block to be marked as suspect on Windows

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Component/s: datanode, hdfs-client
• Assignee: Lukas Majercak
• Reporter: Lukas Majercak
• Created: 20/Sep/17 16:44
• Updated: 16/Mar/18 21:39

Description

DFSClient with hedged reads enabled will often close previous spawned connections if it successfully reads from one of them. This can result in DataNode's BlockSender getting a socket exception and wrongly marking the block as suspect and to be rescanned for errors.

This patch is aimed at adding windows specific network related exception messages to be ignored in BlockSender.sendPacket.

Issue Links

• is related to: HDFS-10627 Volume Scanner marks a block as "suspect" even if the exception is network-related
• is related to: HDFS-7686 Re-add rapid rescan of possibly corrupt block feature to the block scanner
• is related to: HDFS-6450 Support non-positional hedged reads in HDFS