@Test public void testSingleIndexShardFailed() { AllocationService strategy = createAllocationService( settingsBuilder().put("cluster.routing.allocation.concurrent_recoveries", 10).build()); logger.info("Building initial routing table"); MetaData metaData = MetaData.builder() .put(IndexMetaData.builder("test").numberOfShards(1).numberOfReplicas(0)) .build(); RoutingTable routingTable = RoutingTable.builder().addAsNew(metaData.index("test")).build(); ClusterState clusterState = ClusterState.builder().metaData(metaData).routingTable(routingTable).build(); assertThat(routingTable.index("test").shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED)); assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue()); logger.info("Adding one node and rerouting"); clusterState = ClusterState.builder(clusterState) .nodes(DiscoveryNodes.builder().put(newNode("node1"))) .build(); RoutingTable prevRoutingTable = routingTable; routingTable = strategy.reroute(clusterState).routingTable(); clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build(); assertThat(prevRoutingTable != routingTable, equalTo(true)); assertThat(routingTable.index("test").shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().get(0).unassigned(), equalTo(false)); assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(INITIALIZING)); assertThat( routingTable.index("test").shard(0).shards().get(0).currentNodeId(), equalTo("node1")); logger.info("Marking the shard as failed"); RoutingNodes routingNodes = clusterState.routingNodes(); prevRoutingTable = routingTable; routingTable = strategy .applyFailedShard( clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING).get(0)) .routingTable(); clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build(); assertThat(prevRoutingTable != routingTable, equalTo(true)); assertThat(routingTable.index("test").shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(1)); assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED)); assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue()); }