Exemplo n.º 1
0
  private boolean reroute(RoutingAllocation allocation) {
    boolean changed = false;
    // first, clear from the shards any node id they used to belong to that is now dead
    changed |= deassociateDeadNodes(allocation);

    // create a sorted list of from nodes with least number of shards to the maximum ones
    applyNewNodes(allocation);

    // elect primaries *before* allocating unassigned, so backups of primaries that failed
    // will be moved to primary state and not wait for primaries to be allocated and recovered
    // (*from gateway*)
    changed |= electPrimariesAndUnassignedDanglingReplicas(allocation);

    // now allocate all the unassigned to available nodes
    if (allocation.routingNodes().hasUnassigned()) {
      changed |= shardsAllocators.allocateUnassigned(allocation);
      // elect primaries again, in case this is needed with unassigned allocation
      changed |= electPrimariesAndUnassignedDanglingReplicas(allocation);
    }

    // move shards that no longer can be allocated
    changed |= moveShards(allocation);

    // rebalance
    changed |= shardsAllocators.rebalance(allocation);
    assert RoutingNodes.assertShardStats(allocation.routingNodes());
    return changed;
  }
Exemplo n.º 2
0
  /**
   * Only handles reroute but *without* any reassignment of unassigned shards or rebalancing. Does
   * make sure to handle removed nodes, but only moved the shards to UNASSIGNED, does not reassign
   * them.
   */
  public RoutingAllocation.Result rerouteWithNoReassign(ClusterState clusterState, boolean debug) {
    RoutingNodes routingNodes = clusterState.routingNodes();
    // shuffle the unassigned nodes, just so we won't have things like poison failed shards
    routingNodes.unassigned().shuffle();
    RoutingAllocation allocation =
        new RoutingAllocation(
            allocationDeciders,
            routingNodes,
            clusterState.nodes(),
            clusterInfoService.getClusterInfo());
    allocation.debugDecision(debug);
    boolean changed = false;
    // first, clear from the shards any node id they used to belong to that is now dead
    changed |= deassociateDeadNodes(allocation);

    // create a sorted list of from nodes with least number of shards to the maximum ones
    applyNewNodes(allocation);

    // elect primaries *before* allocating unassigned, so backups of primaries that failed
    // will be moved to primary state and not wait for primaries to be allocated and recovered
    // (*from gateway*)
    changed |= electPrimariesAndUnassignedDanglingReplicas(allocation);

    if (!changed) {
      return new RoutingAllocation.Result(false, clusterState.routingTable());
    }
    return new RoutingAllocation.Result(
        true,
        new RoutingTable.Builder()
            .updateNodes(routingNodes)
            .build()
            .validateRaiseException(clusterState.metaData()));
  }