Stream file path format:
Each file has path pattern
[streamName]/[partitionName]/[bucketName].[dat|idx]
Where {@code .dat} is the event data file, {@code .idx} is the accompany index file.
The {@code partitionName} is formatted as
[partitionStartTime].[duration]
with both {@code partitionStartTime} and {@code duration} in seconds.
The {@code bucketName} is formatted as
"bucket".[bucketId].[seqNo]
where the {@code bucketId} is an integer. The {@code seqNo} is a strictly increasing integer for the same{@code bucketId}.