tez-dag/src/main/java/org/apache/tez/dag/history/recovery/RecoveryService.java
tez-plugins/tez-yarn-timeline-history/src/main/java/org/apache/tez/dag/history/logging/ats/ATSHistoryLoggingService.java

tez-dag/src/main/java/org/apache/tez/dag/history/logging/impl/HistoryEventJsonConversion.java
tez-plugins/tez-yarn-timeline-history/src/main/java/org/apache/tez/dag/history/logging/ats/HistoryEventTimelineConversion.java