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https://issues.apache.org/jira/browse/GEODE-8623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233725#comment-17233725
]
ASF GitHub Bot commented on GEODE-8623:
---------------------------------------
jinmeiliao commented on a change in pull request #5743:
URL: https://github.com/apache/geode/pull/5743#discussion_r525312958
##########
File path: geode-common/src/main/java/org/apache/geode/internal/Retry.java
##########
@@ -47,45 +47,44 @@ public void sleep(long sleepTime, TimeUnit sleepTimeUnit)
throws InterruptedExce
}
}
- private static final SteadyClock steadyClock = new SteadyClock();
+ private static final SteadyTimer steadyClock = new SteadyTimer();
/**
* Try the supplier function until the predicate is true or timeout occurs.
*
* @param timeout to retry for
+ * @param timeoutUnit the unit for timeout
* @param interval time between each try
- * @param timeUnit to retry for
+ * @param intervalUnit the unit for interval
* @param supplier to execute until predicate is true or times out
* @param predicate to test for retry
* @param <T> type of return value
* @return value from supplier after it passes predicate or times out.
*/
- public static <T> T tryFor(long timeout,
- long interval,
- TimeUnit timeUnit,
+ public static <T> T tryFor(long timeout, TimeUnit timeoutUnit,
+ long interval, TimeUnit intervalUnit,
Supplier<T> supplier,
Predicate<T> predicate) throws TimeoutException, InterruptedException {
- return tryFor(timeout, interval, timeUnit, supplier, predicate,
steadyClock);
+ return tryFor(timeout, timeoutUnit, interval, intervalUnit, supplier,
predicate, steadyClock);
}
@VisibleForTesting
- static <T> T tryFor(long timeout,
- long interval,
- TimeUnit timeUnit,
+ static <T> T tryFor(long timeout, TimeUnit timeoutUnit,
+ long interval, TimeUnit intervalUnit,
Supplier<T> supplier,
Predicate<T> predicate,
- Clock clock) throws TimeoutException, InterruptedException {
- long until = clock.nanoTime() + NANOSECONDS.convert(timeout, timeUnit);
+ Timer timer) throws TimeoutException, InterruptedException {
+ long until = timer.nanoTime() + NANOSECONDS.convert(timeout, timeoutUnit);
T value;
do {
value = supplier.get();
if (predicate.test(value)) {
return value;
} else {
- clock.sleep(interval, timeUnit);
+ timer.sleep(interval, intervalUnit);
Review comment:
@Bill Your example is a special case where the LAST iteration is the
ONLY iteration. The extra computing only makes a difference in the LAST
iteration and only when it throws a TimeoutException.
I will try to make my case one more time, if after this, you guys still
insist, I will rest my case.
1. Without the extra calculation, we would NEVER delay a normal return, we
will only delay a TimeoutException by a little bit (maximum the rest period).
Since we are going to timeout anyway, I don't really care about this little
extra wait time.
2. The extra calculation only make a difference in the last iteration when
it's about to reach a timeout, for all the previous loops, it's a waste of time
and an extra call to the timer.getTime().
3. `until - now` could be negative, so the calculation should really be
something like `min(interval, (until - now) < 0 ? 0 : (until - now)` which
completely take the beauty and readability out of the code. To me, the
detriment overweights the benefit.
But if you guys still think otherwise, do let me know. I will make the
change. @Bill @pivotal-jbarrett
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> Timing between DNS and Geode startup can result in permanent unknown host
> exceptions.
> -------------------------------------------------------------------------------------
>
> Key: GEODE-8623
> URL: https://issues.apache.org/jira/browse/GEODE-8623
> Project: Geode
> Issue Type: Bug
> Affects Versions: 1.9.0, 1.9.1, 1.10.0, 1.9.2, 1.11.0, 1.12.0, 1.13.0,
> 1.14.0, 1.13.1
> Reporter: Jacob Barrett
> Priority: Minor
> Labels: pull-request-available
>
> In a managed environment were local host name DNS entries and the startup of
> Geode happen concurrently it is possible for Geode to fail name resolution in
> the local hostname caching. If it fails to resolve the local hostname when
> loading the caching utility class then any service dependent on this name
> will fail without chance for recovery.
> {code}
> [error 2020/09/30 19:50:21.644 UTC <main> tid=0x1] Jmx manager could not be
> started because java.net.UnknownHostException
> org.apache.geode.management.ManagementException: java.net.UnknownHostException
> at
> org.apache.geode.management.internal.ManagementAgent.startAgent(ManagementAgent.java:133)
> at
> org.apache.geode.management.internal.SystemManagementService.startManager(SystemManagementService.java:432)
> at
> org.apache.geode.management.internal.beans.ManagementAdapter.handleCacheCreation(ManagementAdapter.java:181)
> at
> org.apache.geode.management.internal.beans.ManagementListener.handleEvent(ManagementListener.java:127)
> at
> org.apache.geode.distributed.internal.InternalDistributedSystem.notifyResourceEventListeners(InternalDistributedSystem.java:2063)
> at
> org.apache.geode.distributed.internal.InternalDistributedSystem.handleResourceEvent(InternalDistributedSystem.java:606)
> at
> org.apache.geode.internal.cache.GemFireCacheImpl.initialize(GemFireCacheImpl.java:1239)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:219)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:171)
> at org.apache.geode.cache.CacheFactory.create(CacheFactory.java:142)
> at
> org.apache.geode.distributed.internal.DefaultServerLauncherCacheProvider.createCache(DefaultServerLauncherCacheProvider.java:52)
> at
> org.apache.geode.distributed.ServerLauncher.createCache(ServerLauncher.java:887)
> at
> org.apache.geode.distributed.ServerLauncher.start(ServerLauncher.java:803)
> at
> org.apache.geode.distributed.ServerLauncher.run(ServerLauncher.java:732)
> at
> org.apache.geode.distributed.ServerLauncher.main(ServerLauncher.java:251)
> Caused by: java.net.UnknownHostException
> at
> org.apache.geode.internal.net.SocketCreator.getLocalHost(SocketCreator.java:285)
> at
> org.apache.geode.management.internal.ManagementAgent.configureAndStart(ManagementAgent.java:310)
> at
> org.apache.geode.management.internal.ManagementAgent.startAgent(ManagementAgent.java:131)
> ... 14 more
> [error 2020/09/30 19:50:21.724 UTC <main> tid=0x1]
> org.apache.geode.management.ManagementException: java.net.UnknownHostException
> Exception in thread "main" org.apache.geode.management.ManagementException:
> java.net.UnknownHostException
> at
> org.apache.geode.management.internal.ManagementAgent.startAgent(ManagementAgent.java:133)
> at
> org.apache.geode.management.internal.SystemManagementService.startManager(SystemManagementService.java:432)
> at
> org.apache.geode.management.internal.beans.ManagementAdapter.handleCacheCreation(ManagementAdapter.java:181)
> at
> org.apache.geode.management.internal.beans.ManagementListener.handleEvent(ManagementListener.java:127)
> at
> org.apache.geode.distributed.internal.InternalDistributedSystem.notifyResourceEventListeners(InternalDistributedSystem.java:2063)
> at
> org.apache.geode.distributed.internal.InternalDistributedSystem.handleResourceEvent(InternalDistributedSystem.java:606)
> at
> org.apache.geode.internal.cache.GemFireCacheImpl.initialize(GemFireCacheImpl.java:1239)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:219)
> at
> org.apache.geode.internal.cache.InternalCacheBuilder.create(InternalCacheBuilder.java:171)
> at org.apache.geode.cache.CacheFactory.create(CacheFactory.java:142)
> at
> org.apache.geode.distributed.internal.DefaultServerLauncherCacheProvider.createCache(DefaultServerLauncherCacheProvider.java:52)
> at
> org.apache.geode.distributed.ServerLauncher.createCache(ServerLauncher.java:887)
> at
> org.apache.geode.distributed.ServerLauncher.start(ServerLauncher.java:803)
> at
> org.apache.geode.distributed.ServerLauncher.run(ServerLauncher.java:732)
> at
> org.apache.geode.distributed.ServerLauncher.main(ServerLauncher.java:251)
> Caused by: java.net.UnknownHostException
> at
> org.apache.geode.internal.net.SocketCreator.getLocalHost(SocketCreator.java:285)
> at
> org.apache.geode.management.internal.ManagementAgent.configureAndStart(ManagementAgent.java:310)
> at
> org.apache.geode.management.internal.ManagementAgent.startAgent(ManagementAgent.java:131)
> ... 14 more
> {code}
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