Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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1.6.3, 1.7.1
Description
According to comments, we can use offset to adjust windows to timezones other than UTC-0. For example, in China you would have to specify an offset of Time.hours(-8).
/** * Creates a new {@code TumblingEventTimeWindows} {@link WindowAssigner} that assigns * elements to time windows based on the element timestamp and offset. * * <p>For example, if you want window a stream by hour,but window begins at the 15th minutes * of each hour, you can use {@code of(Time.hours(1),Time.minutes(15))},then you will get * time windows start at 0:15:00,1:15:00,2:15:00,etc. * * <p>Rather than that,if you are living in somewhere which is not using UTC±00:00 time, * such as China which is using UTC+08:00,and you want a time window with size of one day, * and window begins at every 00:00:00 of local time,you may use {@code of(Time.days(1),Time.hours(-8))}. * The parameter of offset is {@code Time.hours(-8))} since UTC+08:00 is 8 hours earlier than UTC time. * * @param size The size of the generated windows. * @param offset The offset which window start would be shifted by. * @return The time policy. */ public static TumblingEventTimeWindows of(Time size, Time offset) { return new TumblingEventTimeWindows(size.toMilliseconds(), offset.toMilliseconds()); }
but when offset is smaller than zero, a IllegalArgumentException will be throwed.
protected TumblingEventTimeWindows(long size, long offset) { if (offset < 0 || offset >= size) { throw new IllegalArgumentException("TumblingEventTimeWindows parameters must satisfy 0 <= offset < size"); } this.size = size; this.offset = offset; }
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