Yaniv Kunda created HADOOP-19454:
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Summary: Migrate usage of old Java date/time classes to java.time
Key: HADOOP-19454
URL: https://issues.apache.org/jira/browse/HADOOP-19454
Project: Hadoop Common
Issue Type: Improvement
Components: hadoop-common
Reporter: Yaniv Kunda
Many pieces of code still use old Java date/time classes, and can benefit from
migrating to the "new" (Java 8) {{java.time}} APIs for several reasons,
including:
* Non thread-safe SimpleDateFormat - forces ThreadLocal usages and is generally
bad practice these days (see YARN-11116)
* Redundant object creation - e.g. creating a {{java.util.Date}} just to get an
epoch millis value
* All sorts of date/time arithmetics
I propose 3 types of changes in this area:
1) Internal changes - should be trivial to change without user-facing changes
2) User-facing APIs - should be done _extending_ current code, with the
question of deprecating existing code discussed separately
3) External dependencies - value of change vs. cost (complexity/performance)
should be discussed on a case-by-case basis.
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