Apply feedback (2)

Author: tlrx

server/src/main/java/org/elasticsearch/index/engine/ReadOnlyEngine.java

@@ -30,6 +30,7 @@
 import org.apache.lucene.search.SearcherManager;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.Lock;
+import org.elasticsearch.Assertions;
 import org.elasticsearch.Version;
 import org.elasticsearch.common.lucene.Lucene;
 import org.elasticsearch.common.lucene.index.ElasticsearchDirectoryReader;
@@ -111,7 +112,7 @@ public ReadOnlyEngine(EngineConfig config, SeqNoStats seqNoStats, TranslogStats
                     if (globalCheckpoint != SequenceNumbers.UNASSIGNED_SEQ_NO
                         && engineConfig.getIndexSettings().getIndexVersionCreated().onOrAfter(Version.V_6_7_0)) {
                         if (seqNoStats.getMaxSeqNo() != globalCheckpoint) {
-                            assert false : "max seq. no. [" + seqNoStats.getMaxSeqNo() + "] does not match [" + globalCheckpoint + "]";
+                            assertMaxSeqNoEqualsToGlobalCheckpoint(seqNoStats.getMaxSeqNo(), globalCheckpoint);
                             throw new IllegalStateException("Maximum sequence number [" + seqNoStats.getMaxSeqNo()
                                 + "] from last commit does not match global checkpoint [" + globalCheckpoint + "]");
                         }
@@ -135,6 +136,12 @@ public ReadOnlyEngine(EngineConfig config, SeqNoStats seqNoStats, TranslogStats
         }
     }
 
+    protected void assertMaxSeqNoEqualsToGlobalCheckpoint(final long maxSeqNo, final long globalCheckpoint) {
+        if (Assertions.ENABLED) {
+            assert false : "max seq. no. [" + maxSeqNo + "] does not match [" + globalCheckpoint + "]";
+        }
+    }
+
     protected final DirectoryReader wrapReader(DirectoryReader reader,
                                                     Function<DirectoryReader, DirectoryReader> readerWrapperFunction) throws IOException {
         reader = ElasticsearchDirectoryReader.wrap(reader, engineConfig.getShardId());

server/src/test/java/org/elasticsearch/index/engine/ReadOnlyEngineTests.java

@@ -159,7 +159,12 @@ public void testEnsureMaxSeqNoIsEqualToGlobalCheckpoint() throws IOException {
                 engine.flushAndClose();
 
                 IllegalStateException exception = expectThrows(IllegalStateException.class,
-                    () -> new ReadOnlyEngine(engine.engineConfig, null, null, true, Function.identity()));
+                    () -> new ReadOnlyEngine(engine.engineConfig, null, null, true, Function.identity()) {
+                        @Override
+                        protected void assertMaxSeqNoEqualsToGlobalCheckpoint(final long maxSeqNo, final long globalCheckpoint) {
+                            // we don't want the assertion to trip in this test
+                        }
+                    });
                 assertThat(exception.getMessage(), equalTo("Maximum sequence number [" + maxSeqNo
                     + "] from last commit does not match global checkpoint [" + globalCheckpoint.get() + "]"));
             } finally {