Do not retry replication when local repository not found

When many repositories get created and deleted in a quick succession it
may happen that a repository gets deleted before its replication task
starts. Such replication task will keep retrying, possibly indefinitely,
but has no chance to succeed.

Another scenario where this issue can occur is when a repository gets
created but a replica is not reachable for some time. If the repository
gets deleted before the replica gets reachable again, the replication
task will keep retrying but the local repository will not exist.

When handling the RepositoryNotFoundException in PushOne, set the
retrying flag to false. This ensures that this replication task is
not retried and gets finished.

Bug: Issue 15804
Change-Id: Ia55c5ec1c961f4c2aec9ecee8056f22b436e9fda

src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java b/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
index ebc8889..693dd73 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
@@ -376,8 +376,12 @@
           "Replication to %s completed in %dms, %dms delay, %d retries",
           uri, elapsed, delay, retryCount);
     } catch (RepositoryNotFoundException e) {
+      retryDone();
       stateLog.error(
-          "Cannot replicate " + projectName + "; Local repository error: " + e.getMessage(),
+          "Cannot replicate "
+              + projectName
+              + "; Local repository does not exist: "
+              + e.getMessage(),
           getStatesAsArray());
 
     } catch (RemoteRepositoryException e) {

src/test/java/com/googlesource/gerrit/plugins/replication/PushOneTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/PushOneTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/PushOneTest.java
index 94f0dc4..4bd084d 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/PushOneTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/PushOneTest.java
@@ -14,6 +14,7 @@
 
 package com.googlesource.gerrit.plugins.replication;
 
+import static com.google.common.truth.Truth.assertThat;
 import static org.eclipse.jgit.lib.Ref.Storage.NEW;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
@@ -46,6 +47,7 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import org.eclipse.jgit.errors.NotSupportedException;
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.ObjectId;
@@ -223,6 +225,17 @@
     verify(transportMock, never()).push(any(), any());
   }
 
+  @Test
+  public void shouldNotKeepRetryingWhenRepositoryNotFound() throws Exception {
+    when(gitRepositoryManagerMock.openRepository(projectNameKey))
+        .thenThrow(new RepositoryNotFoundException("not found"));
+    PushOne pushOne = createPushOne(null);
+    pushOne.addRef(PushOne.ALL_REFS);
+    pushOne.setToRetry();
+    pushOne.run();
+    assertThat(pushOne.isRetrying()).isFalse();
+  }
+
   private PushOne createPushOne(DynamicItem<ReplicationPushFilter> replicationPushFilter) {
     PushOne push =
         new PushOne(