wbo4958 commented on PR #37855: URL: https://github.com/apache/spark/pull/37855#issuecomment-1260417639
> Good catch! seems we can also simply switch to `XORShiftRandom` which always [hash the seeds](https://github.com/apache/spark/blob/e1ea806b3075d279b5f08a29fe4c1ad6d3c4191a/core/src/main/scala/org/apache/spark/util/random/XORShiftRandom.scala#L58-L67) > > ``` > scala> (1 to 200).map(partitionId => new Random(partitionId).nextInt(4)) > val res3: IndexedSeq[Int] = Vector(2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2) > > scala> (1 to 200).map(partitionId => new XORShiftRandom(partitionId).nextInt(4)) > val res4: IndexedSeq[Int] = Vector(0, 3, 2, 2, 3, 3, 1, 2, 2, 0, 2, 2, 2, 1, 2, 2, 0, 3, 2, 0, 3, 3, 1, 1, 1, 1, 0, 0, 2, 3, 1, 3, 0, 1, 1, 2, 0, 2, 1, 3, 3, 0, 0, 1, 1, 3, 0, 2, 1, 1, 2, 0, 1, 3, 0, 0, 0, 1, 0, 3, 2, 1, 3, 3, 3, 0, 1, 0, 3, 0, 0, 0, 3, 0, 2, 1, 0, 2, 0, 2, 2, 0, 3, 0, 2, 3, 0, 1, 1, 1, 1, 3, 3, 3, 3, 3, 0, 1, 3, 1, 3, 0, 2, 1, 2, 1, 3, 0, 1, 1, 0, 2, 0, 0, 3, 0, 2, 1, 1, 2, 0, 3, 1, 3, 1, 0, 0, 2, 3, 1, 2, 1, 3, 0, 1, 2, 2, 2, 1, 3, 3, 3, 0, 2, 2, 3, 0, 1, 0, 3, 0, 2, 1, 2, 1, 2, 1, 1, 3, 3, 0, 2, 0, 0, 1, 1, 1, 1, 2, 0, 0, 1, 0, 1, 3, 0, 3, 1, 1, 3, 2, 3, 1, 2, 3, 0, 3, 3, 2, 3, 0, 0, 1, 1, 0, 2, 1, 0, 0, 2) > ``` Yeah, I tried XORShiftRandom is working well, see https://github.com/apache/spark/pull/37855#issuecomment-1245363471 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
