App Timeline Service fails to start after HDP upgrade

[#1]

SYMPTOM: Upon starting the App Timeline Service after an Ambari & HDP upgrade, the following errors were thrown and the service was unable to start:

ERROR:

2015-08-02 22:56:24,311 INFO service.AbstractService (AbstractService.java:noteFailure(272)) - Service org.apache.hadoop.yarn.server.timeline.LeveldbTimelineStore failed in state INITED; cause: 
org.fusesource.leveldbjni.internal.NativeDB$DBException: Corruption: 116 missing files; e.g.: /tmp/hadoop/yarn/timeline/leveldb-timeline-store.ldb/001052.sst 
org.fusesource.leveldbjni.internal.NativeDB$DBException: Corruption: 116 missing files; e.g.: /tmp/hadoop/yarn/timeline/leveldb-timeline-store.ldb/001052.sst 

ROOT CAUSE: The issue is with corrupted SST's in the app timeline db path.

RESOLUTION: Navigate to /hadoop/yarn/timeline/leveldb-timeline-store.ldb

From there you will see a text file named "CURRENT" Please back this file up in /tmp and then remove the file as such: cp /hadoop/yarn/timeline/leveldb-timeline-store.ldb/CURRENT /tmp rm /hadoop/yarn/timeline/leveldb-timeline-store.ldb/CURRENT Restart the service via Ambari