[HDFS-7929] inotify unable fetch pre-upgrade edit log segments once upgrade starts

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
• Labels: 2.6.1-candidate
• Target Version/s: 2.7.0
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 13/Mar/15 17:20
• Updated: 30/Aug/16 01:38
• Resolved: 19/Mar/15 01:49

Description

inotify is often used to periodically poll HDFS events. However, once an HDFS upgrade has started, edit logs are moved to /previous on the NN, which is not accessible. Moreover, once the upgrade is finalized /previous is currently lost forever.

Issue Links

• breaks: HDFS-8480 Fix performance and timeout issues in HDFS-7929 by using hard-links to preserve old edit logs instead of copying them