dlmarion commented on code in PR #2792:
URL: https://github.com/apache/accumulo/pull/2792#discussion_r957281922
##########
server/gc/src/main/java/org/apache/accumulo/gc/GarbageCollectionAlgorithm.java:
##########
@@ -216,6 +225,46 @@ private long
removeBlipCandidates(GarbageCollectionEnvironment gce,
return blipCount;
}
+ @VisibleForTesting
+ /**
+ *
+ */
Review Comment:
Addressed in c4e0ab918bf002c83d4200af67df0578aff44e73
##########
server/gc/src/test/java/org/apache/accumulo/gc/GarbageCollectionTest.java:
##########
@@ -778,4 +838,152 @@ public void bulkImportReplicationRecordsPreventDeletion()
throws Exception {
assertEquals(1, gce.deletes.size());
assertEquals("hdfs://foo.com:6000/accumulo/tables/2/t-00002/A000002.rf",
gce.deletes.get(0));
}
+
+ @Test
+ public void testMissingTableIds() throws Exception {
+ GarbageCollectionAlgorithm gca = new GarbageCollectionAlgorithm();
+
+ TestGCE gce = new TestGCE();
+
+ gce.candidates.add("hdfs://foo.com:6000/user/foo/tables/a/t-0/F00.rf");
+
+ gce.addFileReference("a", null,
"hdfs://foo.com:6000/user/foo/tables/a/t-0/F00.rf");
+ gce.addFileReference("c", null,
"hdfs://foo.com:6000/user/foo/tables/c/t-0/F00.rf");
+
+ // add 2 more table references that will not be seen by in the scan
+ gce.tableIds.addAll(Arrays.asList(TableId.of("b"), TableId.of("d")));
+
+ String msg = assertThrows(RuntimeException.class, () ->
gca.collect(gce)).getMessage();
+ assertTrue((msg.contains("[b, d]") || msg.contains("[d, b]"))
+ && msg.contains("Saw table IDs in ZK that were not in metadata
table:"), msg);
+ }
+
+ // below are tests for potential failure conditions of the GC process. Some
of these cases were
+ // observed on clusters. Some were hypothesis based on observations. The
result was that
+ // candidate entries were not removed when they should have been and
therefore files were
+ // removed from HDFS that were actually still in use
+
+ private Set<TableId> makeUnmodifiableSet(String... args) {
+ Set<TableId> t = new HashSet<>();
+ for (String arg : args) {
+ t.add(TableId.of(arg));
+ }
+ return Collections.unmodifiableSet(t);
+ }
+
+ @Test
+ public void testNormalGCRun() {
+ // happy path, no tables added or removed during this portion and all the
tables checked
+ Set<TableId> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<TableId> tablesSeen = makeUnmodifiableSet("2", "1", "3");
+ Set<TableId> tablesAfter = makeUnmodifiableSet("1", "3", "2");
+
+ new GarbageCollectionAlgorithm().ensureAllTablesChecked(tablesBefore,
tablesSeen, tablesAfter);
+ }
+
+ @Test
+ public void testTableAddedInMiddle() {
+ // table was added during this portion and we don't see it, should be fine
+ Set<TableId> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<TableId> tablesSeen = makeUnmodifiableSet("2", "1", "3");
+ Set<TableId> tablesAfter = makeUnmodifiableSet("1", "3", "2", "4");
+
+ new GarbageCollectionAlgorithm().ensureAllTablesChecked(tablesBefore,
tablesSeen, tablesAfter);
+ }
+
+ @Test
+ public void testTableAddedInMiddleTwo() {
+ // table was added during this portion and we DO see it
+ // Means table was added after candidates were grabbed, so there should be
nothing to remove
+ Set<TableId> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<TableId> tablesSeen = makeUnmodifiableSet("2", "1", "3", "4");
+ Set<TableId> tablesAfter = makeUnmodifiableSet("1", "3", "2", "4");
+
+ new GarbageCollectionAlgorithm().ensureAllTablesChecked(tablesBefore,
tablesSeen, tablesAfter);
+ }
+
+ @Test
+ public void testTableDeletedInMiddle() {
+ // table was deleted during this portion and we don't see it
+ // this mean any candidates from the deleted table wil stay on the
candidate list
+ // and during the delete step they will try to removed
+ Set<TableId> tablesBefore = makeUnmodifiableSet("1", "2", "3", "4");
+ Set<TableId> tablesSeen = makeUnmodifiableSet("2", "1", "4");
+ Set<TableId> tablesAfter = makeUnmodifiableSet("1", "2", "4");
+
+ new GarbageCollectionAlgorithm().ensureAllTablesChecked(tablesBefore,
tablesSeen, tablesAfter);
+ }
+
+ @Test
+ public void testTableDeletedInMiddleTwo() {
+ // table was deleted during this portion and we DO see it
+ // this mean candidates from the deleted table may get removed from the
candidate list
+ // which should be ok, as the delete table function should be responsible
for removing those
+ Set<TableId> tablesBefore = makeUnmodifiableSet("1", "2", "3", "4");
+ Set<TableId> tablesSeen = makeUnmodifiableSet("2", "1", "4", "3");
+ Set<TableId> tablesAfter = makeUnmodifiableSet("1", "2", "4");
+
+ new GarbageCollectionAlgorithm().ensureAllTablesChecked(tablesBefore,
tablesSeen, tablesAfter);
+ }
+
+ @Test
+ public void testMissEntireTable() {
+ // this test simulates missing an entire table when looking for what files
are in use
+ // if you add custom splits to the metadata at able boundaries, this can
happen with a failed
+ // scan
+ // recall the ~tab:~pr for this first entry of a new table is empty, so
there is now way to
+ // check the prior row. If you split a couple of tables in the metadata
the table boundary
+ // , say table ids 2,3,4, and then miss scanning table 3 but get 4, it is
possible other
+ // consistency checks will miss this
Review Comment:
Addressed in c4e0ab918bf002c83d4200af67df0578aff44e73
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