bharatviswa504 commented on a change in pull request #714: HDDS-1406. Avoid
usage of commonPool in RatisPipelineUtils.
URL: https://github.com/apache/hadoop/pull/714#discussion_r274539471
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/RatisPipelineUtils.java
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@@ -51,6 +52,15 @@
private static final Logger LOG =
LoggerFactory.getLogger(RatisPipelineUtils.class);
+ // Set parallelism at 3, as now in Ratis we create 1 and 3 node pipelines.
+ private static int parallelismForPool =
+ (Runtime.getRuntime().availableProcessors() > 3) ? 3 :
+ Runtime.getRuntime().availableProcessors();
+
+ private static ForkJoinPool pool = new ForkJoinPool(parallelismForPool);
Review comment:
Used ForkJoinPool can be used for normal tasks also. Refer NonFrok Join
Clients.
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html
Used this ForJoinPool here to take advantage of its WorkSteal Algorithm in
allocating/claiming threads. I think this might be useful. More can be read
from the documentation.
And if no of available processors is less than 3, even setting to 3 will not
have any advantage. This is the reason for setting this.
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