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https://issues.apache.org/jira/browse/RATIS-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977700#comment-16977700
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Attila Doroszlai commented on RATIS-749:
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Thanks [~szetszwo] for committing it.
> Create constant for set of not running states
> ---------------------------------------------
>
> Key: RATIS-749
> URL: https://issues.apache.org/jira/browse/RATIS-749
> Project: Ratis
> Issue Type: Improvement
> Components: server
> Reporter: Attila Doroszlai
> Assignee: Attila Doroszlai
> Priority: Minor
> Labels: performance
> Fix For: 0.5.0
>
> Attachments: RATIS-749.001.patch, RATIS-749.001b.patch,
> RATIS-749.002.patch, RATIS-749.002b.patch, allocations.png
>
>
> {{LogAppender$AppenderDaemon#isRunning}} creates a new array for varargs of
> {{LifeCycle$State#isOneOf}} upon each call:
> {code:title=https://github.com/apache/incubator-ratis/blob/005aa6ab0f7a9051bb4c4a47660bca29ec70aa20/ratis-server/src/main/java/org/apache/ratis/server/impl/LogAppender.java#L98-L100}
> boolean isRunning() {
> return !lifeCycle.getCurrentState().isOneOf(CLOSING, CLOSED, EXCEPTION);
> }
> {code}
> This is frequently called (indirectly) from the main loop:
> {code:title=https://github.com/apache/incubator-ratis/blob/005aa6ab0f7a9051bb4c4a47660bca29ec70aa20/ratis-server/src/main/java/org/apache/ratis/server/impl/LogAppender.java#L450-L451}
> protected void runAppenderImpl() throws InterruptedException, IOException {
> while (isAppenderRunning()) {
> {code}
> There should be a constant array defined with these states to reduce GC.
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