[MAPREDUCE-5384] Races in DelegationTokenRenewal

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.2.0, 1.1.2, 1.2.1
• Target Version/s: 1.3.0
• Assignee: Unassigned
• Reporter: Karthik Kambatla
• Created: 11/Jul/13 20:26
• Updated: 28/Dec/14 18:34

Description

There are a couple of races in DelegationTokenRenewal.

One of them was addressed by MAPREDUCE-4860, which introduced a deadlock while fixing this race. Opening a new JIRA per discussion in MAPREDUCE-5364, since MAPREDUCE-4860 is already shipped in a release.

Races to fix:

1. TimerTask#cancel() disallows future invocations of run(), but doesn't abort an already scheduled/started run().
2. In the context of DelegationTokenRenewal, RenewalTimerTask#cancel() only cancels that TimerTask instance. However, it has no effect on any other TimerTasks created for that token.

Issue Links

• is related to: MAPREDUCE-4860 DelegationTokenRenewal attempts to renew token even after a job is removed
• relates to: MAPREDUCE-5364 Deadlock between RenewalTimerTask methods cancel() and run()