keith-turner commented on a change in pull request #2320:
URL: https://github.com/apache/accumulo/pull/2320#discussion_r752621175
##########
File path:
server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java
##########
@@ -791,6 +798,57 @@ public void run() {
}
}, 0, 5000, TimeUnit.MILLISECONDS);
+ // 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.
+ onlineTabletsSnapshot.forEach((k, v) -> {
+ if (Ample.DataLevel.of(k.tableId()) == Ample.DataLevel.USER) {
+ userTablets.add(k);
+ } else {
+ nonUserTablets.add(k);
+ }
+ });
+
+ 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 = IteratorUtils.toList(tabletsMetadata.iterator());
Review comment:
Could do this w/ standard java code avoiding a third party dep.
```suggestion
tmdList = tabletsMetadata.stream().collect(Collectors.toList());
```
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