chiranjeevi created HIVE-29037:
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Summary: Incorrect time calculation in HiveSplitGenerator causing
negative elapsed time in logs
Key: HIVE-29037
URL: https://issues.apache.org/jira/browse/HIVE-29037
Project: Hive
Issue Type: Bug
Components: Hive
Reporter: chiranjeevi
The HiveSplitGenerator class incorrectly calculates elapsed time for split
serialization operations, resulting in negative time values in the logs. This
makes debugging and performance analysis difficult.
The calculation fileWriteStarted - Time.monotonicNow() is reversed. Since
Time.monotonicNow() returns the current time, which is always greater than
fileWriteStarted (the time when the operation started), this calculation always
produces a negative number.
```javascript
2025-06-21 16:43:28,637 [DEBUG] [HiveSplitGenerator.SplitSerializer Thread -
#2] |tez.HiveSplitGenerator|: Split #41 event to output path:
hdfs://clustername/tmp/hive/staging/.tez/application_1749793988888_0095/events/hive_20250621164323_c39588f6-0ae9-48ad-8db5-5e43cf4a1b1d/0_catalog_sales_InputDataInformationEvent_41
written in *-320 ms*
```
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