smiklosovic commented on code in PR #4515:
URL: https://github.com/apache/cassandra/pull/4515#discussion_r2594224585
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src/java/org/apache/cassandra/service/disk/usage/DiskUsageMonitor.java:
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@@ -79,14 +81,28 @@ public void start(Consumer<DiskUsageState> notifier)
{
// start the scheduler regardless guardrail is enabled, so we can
enable it later without a restart
ScheduledExecutors.scheduledTasks.scheduleAtFixedRate(() -> {
-
- if (!Guardrails.localDataDiskUsage.enabled(null))
+ boolean currentEnabledStatus =
Guardrails.localDataDiskUsage.enabled(null);
+ boolean oldEnabledStatus = enabled;
+ enabled = currentEnabledStatus;
+ if (!currentEnabledStatus)
Review Comment:
this `if` is ever entered only in case `currentEnabledStatus` is `false`.
Then you do
if (currentEnabledStatus != oldEnabledStatus)
That means that `currentEnabledStatus` is true, which can not equal to
`oldEnbledStatus`.
That means that in order to call `onDiskUsageGuardrailDisabled` method,
`oldEnabledStatus` has to be `true`.
This can then be simplified to
if (!currentEnabledStatus)
{
if (oldEnabledStatus)
onDiskUsageGuardrailDisabled(notifier);
}
else
updateLocalState(getDiskUsage(), notifier);
Which can be further simplified to
if (!currentEnabledStatus && oldEnabledStatus)
onDiskUsageGuardrailDisabled(notifier);
else
updateLocalState(getDiskUsage(), notifier);
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