re-enable faulty TaskTracker storage without restarting TT, when appropriate
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Key: MAPREDUCE-3077
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3077
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Affects Versions: 0.20.205.0
Reporter: Matt Foley
In MAPREDUCE-2928, Ravi Gummadi proposed:
bq. we can add LocalStorage.checkBadLocalDirs() call to TT.initialize() that
can do disk-health-check of bad local dirs and add dirs to the good local dirs
list if they become good.
and Eli Collins added:
bq. Sounds good. Since transient disk failures may cause a file system to
become read-only (causing permanent failures) sometimes re-mounting is
sufficient to recover in which case it makes sense to re-enable faulty disks
w/o TT restart.
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