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https://issues.apache.org/jira/browse/STORM-1650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208483#comment-15208483
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ASF GitHub Bot commented on STORM-1650:
---------------------------------------
Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1250#discussion_r57167305
--- Diff: storm-core/src/jvm/org/apache/storm/grouping/ShuffleGrouping.java
---
@@ -35,7 +36,7 @@
@Override
public void prepare(WorkerTopologyContext context, GlobalStreamId
stream, List<Integer> targetTasks) {
- random = new Random();
+ random = new XORShiftRandom();
--- End diff --
Same as above. Having repeated numbers is not a big deal here, but we do
want to have a comment declaring that this is safe and what the ramifications
are.
> improve performance by XORShiftRandom
> -------------------------------------
>
> Key: STORM-1650
> URL: https://issues.apache.org/jira/browse/STORM-1650
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: John Fang
> Assignee: John Fang
>
> '''Implement a random number generator based on the XORShift algorithm
> discovered by George Marsaglia. This RNG is observed 4.5 times faster than
> {@link Random} in benchmark, with the cost that abandon thread-safety. So
> it's recommended to create a new {@link XORShiftRandom} for each thread.'''
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