The proposed fix is to address the performance degradation caused by the fix to JDK-8275721. Some amount of the degradation cannot be avoided as the lookup now falls back up to the bundles at Locale.ROOT. However, by lowering the fallback priority of `regionFormatFallback` than `COMPAT`'s lookup, it can avoid the excess bundle lookups for regions. I also changed the test case `TestZoneTextPrinterParser.java`, which currently iterates over 3 nested loops, i.e., all-locales x all-timezones x 8, which is absolutely unnecessary. Made it to sample some locales. In addition, I added a microbenchmark for the DateFormatSymbols.getZoneStrings() method. Here is the result:
Before the fix to JDK-8275721: Benchmark Mode Cnt Score Error Units ZoneStrings.testZoneStrings ss 5 6.865 ± 0.696 s/op Before the proposed fix: Benchmark Mode Cnt Score Error Units ZoneStrings.testZoneStrings ss 5 15.741 ± 4.300 s/op After the proposed fix: Benchmark Mode Cnt Score Error Units ZoneStrings.testZoneStrings ss 5 9.756 ± 3.685 s/op ------------- Commit messages: - Added a microbenchmark for zone strings - 8278434: timeouts in test java/time/test/java/time/format/TestZoneTextPrinterParser.java Changes: https://git.openjdk.java.net/jdk/pull/6790/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6790&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8278434 Stats: 72 lines in 3 files changed: 59 ins; 7 del; 6 mod Patch: https://git.openjdk.java.net/jdk/pull/6790.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/6790/head:pull/6790 PR: https://git.openjdk.java.net/jdk/pull/6790
