dlmarion commented on code in PR #4562:
URL: https://github.com/apache/accumulo/pull/4562#discussion_r1602253758
##########
server/manager/src/main/java/org/apache/accumulo/manager/Manager.java:
##########
@@ -740,6 +741,48 @@ private void cleanupOfflineMigrations() {
}
}
+ private class ScanServerZKCleaner implements Runnable {
+
+ @Override
+ public void run() {
+
+ final ZooReaderWriter zrw = getContext().getZooReaderWriter();
+ final String sserverZNodePath = getContext().getZooKeeperRoot() +
Constants.ZSSERVERS;
+
+ while (stillManager()) {
+ try {
+ for (String sserverClientAddress :
zrw.getChildren(sserverZNodePath)) {
+
+ final String sServerZPath = sserverZNodePath + "/" +
sserverClientAddress;
+ final var zLockPath = ServiceLock.path(sServerZPath);
+ ZcStat stat = new ZcStat();
+ byte[] lockData =
ServiceLock.getLockData(getContext().getZooCache(), zLockPath, stat);
+
+ if (lockData == null) {
+ try {
+ log.debug("Deleting empty ScanServer ZK node {}",
sServerZPath);
+ zrw.delete(sServerZPath);
+ } catch (KeeperException.NotEmptyException e) {
+ log.debug(
+ "Failed to delete ScanServer ZK node {} its not empty,
likely an expected race condition.",
+ sServerZPath);
+ }
+ }
+ }
+ } catch (KeeperException e) {
+ log.error("Exception trying to delete empty scan server ZNodes, will
retry", e);
+ } catch (InterruptedException e) {
+ Thread.interrupted();
+ log.error("Interrupted trying to delete empty scan server ZNodes,
will retry", e);
+ } finally {
+ // sleep for 5 mins
+ sleepUninterruptibly(TIME_BETWEEN_MIGRATION_CLEANUPS, MILLISECONDS);
Review Comment:
> Basically I needed to lookup the constant and decode what * ONE_SECOND was
to see that the MILLISECONDS are the correct units. Just saying that the wait
was 5 minutes more directly could improve clarity? Probably more of a personal
preference and can be ignored
:rofl: . Yeah, it should be changed. I can do that, I have the power.
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