LuciferYang commented on code in PR #44613:
URL: https://github.com/apache/spark/pull/44613#discussion_r1443097993
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core/src/main/scala/org/apache/spark/ui/UIUtils.scala:
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@@ -42,15 +44,18 @@ private[spark] object UIUtils extends Logging {
val TABLE_CLASS_STRIPED = TABLE_CLASS_NOT_STRIPED + " table-striped"
val TABLE_CLASS_STRIPED_SORTABLE = TABLE_CLASS_STRIPED + " sortable"
- // SimpleDateFormat is not thread-safe. Don't expose it to avoid improper
use.
- private val dateFormat = new ThreadLocal[SimpleDateFormat]() {
- override def initialValue(): SimpleDateFormat =
- new SimpleDateFormat("yyyy/MM/dd HH:mm:ss", Locale.US)
- }
+ private val dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy/MM/dd
HH:mm:ss", Locale.US)
Review Comment:
How about
```scala
private val dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy/MM/dd
HH:mm:ss", Locale.US)
.withZone(java.time.ZoneId.systemDefault())
def formatDate(date: Date): String = dateTimeFormatter.format(date.toInstant)
def formatDate(timestamp: Long): String =
dateTimeFormatter.format(Instant.ofEpochMilli(timestamp))
```
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