ctubbsii commented on code in PR #2638:
URL: https://github.com/apache/accumulo/pull/2638#discussion_r853006495
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test/src/main/java/org/apache/accumulo/test/compaction/ExternalCompactionMetricsIT.java:
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@@ -166,7 +166,7 @@ public void testMetrics() throws Exception {
UtilWaitThread.sleep(100);
try (TabletsMetadata tm =
getCluster().getServerContext().getAmple().readTablets()
.forLevel(DataLevel.USER).fetch(ColumnType.ECOMP).build()) {
- count = tm.stream().flatMap(t ->
t.getExternalCompactions().keySet().stream()).count();
+ count = tm.stream().mapToLong(t ->
t.getExternalCompactions().keySet().size()).sum();
Review Comment:
The output of the user function that you pass to flatMap should be a Stream.
So, you're converting the original stream into a stream of streams. flatMap
then just concatenates them, so all the elements of each of those streams are
put into one output stream.
These should be identical. Essentially, it goes from `sizeof(concat(set1,
set2, ... setN))` to `sum(sizeof(set1), sizeof(set2), ... sizeof(setN))`.
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