mjwall commented on a change in pull request #2293:
URL: https://github.com/apache/accumulo/pull/2293#discussion_r732133777
##########
File path:
server/gc/src/test/java/org/apache/accumulo/gc/GarbageCollectionTest.java
##########
@@ -644,4 +692,132 @@ 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");
+
+ // the following table ids must be seen in the references
+ gce.tableIds.add("a");
+ gce.tableIds.add("b");
+ gce.tableIds.add("c");
+ gce.tableIds.add("d");
+
+ String msg = assertThrows(RuntimeException.class, () ->
gca.collect(gce)).getMessage();
+ assertTrue(msg, (msg.contains("[b, d]") || msg.contains("[d, b]"))
+ && msg.contains("Saw table IDs in ZK that were not in metadata
table:"));
+ }
+
+ // 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<String> makeUnmodifiableSet(String... args) {
+ return Collections.unmodifiableSet(new HashSet<>(Arrays.asList(args)));
+ }
+
+ @Test
+ public void testNormalGCRun() {
+ // happy path, no tables added or removed during this portion and all the
tables checked
+ Set<String> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<String> tablesSeen = makeUnmodifiableSet("2", "1", "3");
+ Set<String> 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<String> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<String> tablesSeen = makeUnmodifiableSet("2", "1", "3");
+ Set<String> 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<String> tablesBefore = makeUnmodifiableSet("1", "2", "3");
+ Set<String> tablesSeen = makeUnmodifiableSet("2", "1", "3", "4");
+ Set<String> 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<String> tablesBefore = makeUnmodifiableSet("1", "2", "3", "4");
+ Set<String> tablesSeen = makeUnmodifiableSet("2", "1", "4");
+ Set<String> 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<String> tablesBefore = makeUnmodifiableSet("1", "2", "3", "4");
+ Set<String> tablesSeen = makeUnmodifiableSet("2", "1", "4", "3");
+ Set<String> 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
+ Set<String> tablesBefore = makeUnmodifiableSet("1", "2", "3", "4");
+ Set<String> tablesSeen = makeUnmodifiableSet("1", "2", "4");
+ Set<String> tablesAfter = makeUnmodifiableSet("1", "2", "3", "4");
+
Review comment:
adding these tests, thanks @keith-turner
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