ctubbsii commented on a change in pull request #2320:
URL: https://github.com/apache/accumulo/pull/2320#discussion_r761253403
##########
File path:
server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java
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@@ -794,6 +802,58 @@ public void run() {
}
}, 0, 5000, TimeUnit.MILLISECONDS);
+ int tabletCheckFrequency = 30 + random.nextInt(31); // random 30-60 minute
delay
+ // Periodically check that metadata of tablets matches what is held in
memory
+
ThreadPools.createGeneralScheduledExecutorService(aconf).scheduleWithFixedDelay(()
-> {
+ final SortedMap<KeyExtent,Tablet> onlineTabletsSnapshot =
onlineTablets.snapshot();
+
+ final SortedSet<KeyExtent> userTablets = new TreeSet<>();
+ final SortedSet<KeyExtent> nonUserTablets = new TreeSet<>();
+
+ // Create subsets of tablets based on DataLevel: one set who's DataLevel
is USER and another
+ // containing the remaining tablets (those who's DataLevel is ROOT or
METADATA).
+ // This needs to happen so we can use .readTablets() on the
DataLevel.USER tablets in order
+ // to reduce RPCs.
+ // TODO: Push this partitioning, based on DataLevel, to ample - accumulo
issue #2373
+ onlineTabletsSnapshot.forEach((ke, tablet) -> {
+ if (Ample.DataLevel.of(ke.tableId()) == Ample.DataLevel.USER) {
+ userTablets.add(ke);
+ } else {
+ nonUserTablets.add(ke);
+ }
+ });
+
+ Map<KeyExtent,Long> updateCounts = new HashMap<>();
+
+ // gather updateCounts for each tablet
+ onlineTabletsSnapshot.forEach((ke, tablet) -> {
+ updateCounts.put(ke, tablet.getUpdateCount());
+ });
+
+ List<TabletMetadata> tmdList;
+
+ // gather metadata for all tablets with DataLevel.USER using
readTablets()
+ try (TabletsMetadata tabletsMetadata =
getContext().getAmple().readTablets()
+ .forTablets(userTablets).fetch(FILES, LOGS, ECOMP,
PREV_ROW).build()) {
+ tmdList = tabletsMetadata.stream().collect(Collectors.toList());
+ }
+
+ // gather metadata for all tablets with DataLevel.ROOT or METADATA using
readTablet()
+ nonUserTablets.forEach(extent -> {
+ TabletMetadata tabletMetadata =
+ getContext().getAmple().readTablet(extent, FILES, LOGS, ECOMP,
PREV_ROW);
+ tmdList.add(tabletMetadata);
Review comment:
The way this is typically done is by just creating two streams, merging
the streams, and calling `Collectors.toList()` once on the merged stream,
rather than trying to mutate the resulting list.
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