예제 #1
0
  /**
   * Sends the new view and digest to all subgroup coordinors in coords. Each coord will in turn
   *
   * <ol>
   *   <li>broadcast the new view and digest to all the members of its subgroup (MergeView)
   *   <li>on reception of the view, if it is a MergeView, each member will set the digest and
   *       install the new view
   * </ol>
   */
  private void sendMergeView(
      Collection<Address> coords, MergeData combined_merge_data, MergeId merge_id) {
    if (coords == null || combined_merge_data == null) return;

    View view = combined_merge_data.view;
    Digest digest = combined_merge_data.digest;
    if (view == null || digest == null) {
      if (log.isErrorEnabled())
        log.error("view or digest is null, cannot send consolidated merge view/digest");
      return;
    }

    if (log.isDebugEnabled())
      log.debug(
          gms.local_addr + ": sending merge view " + view.getVid() + " to coordinators " + coords);

    gms.merge_ack_collector.reset(coords);
    int size = gms.merge_ack_collector.size();
    long timeout = gms.view_ack_collection_timeout;

    long start = System.currentTimeMillis();
    for (Address coord : coords) {
      Message msg = new Message(coord, null, null);
      GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW);
      hdr.view = view;
      hdr.my_digest = digest;
      hdr.merge_id = merge_id;
      msg.putHeader(gms.getId(), hdr);
      gms.getDownProtocol().down(new Event(Event.MSG, msg));
    }

    // [JGRP-700] - FLUSH: flushing should span merge
    // if flush is in stack wait for acks from separated island coordinators
    if (gms.flushProtocolInStack) {
      try {
        gms.merge_ack_collector.waitForAllAcks(timeout);
        long stop = System.currentTimeMillis();
        if (log.isTraceEnabled())
          log.trace(
              "received all ACKs ("
                  + size
                  + ") for merge view "
                  + view
                  + " in "
                  + (stop - start)
                  + "ms");
      } catch (TimeoutException e) {
        log.warn(
            gms.local_addr
                + ": failed to collect all ACKs for merge ("
                + size
                + ") for view "
                + view
                + " after "
                + timeout
                + "ms, missing ACKs from "
                + gms.merge_ack_collector.printMissing());
      }
    }
  }
예제 #2
0
    /**
     * Merge all MergeData. All MergeData elements should be disjunct (both views and digests).
     * However, this method is prepared to resolve duplicate entries (for the same member).
     * Resolution strategy for views is to merge only 1 of the duplicate members. Resolution
     * strategy for digests is to take the higher seqnos for duplicate digests.
     *
     * <p>After merging all members into a Membership and subsequent sorting, the first member of
     * the sorted membership will be the new coordinator. This method has a lock on merge_rsps.
     *
     * @param merge_rsps A list of MergeData items. Elements with merge_rejected=true were removed
     *     before. Is guaranteed not to be null and to contain at least 1 member.
     */
    private MergeData consolidateMergeData(Vector<MergeData> merge_rsps) {
      long logical_time = 0; // for new_vid
      Membership new_mbrs = new Membership();
      Vector<View> subgroups =
          new Vector<View>(11); // contains a list of Views, each View is a subgroup

      for (MergeData tmp_data : merge_rsps) {
        View tmp_view = tmp_data.getView();
        if (tmp_view != null) {
          ViewId tmp_vid = tmp_view.getVid();
          if (tmp_vid != null) {
            // compute the new view id (max of all vids +1)
            logical_time = Math.max(logical_time, tmp_vid.getId());
          }
          // merge all membership lists into one (prevent duplicates)
          new_mbrs.add(tmp_view.getMembers());
          subgroups.addElement((View) tmp_view.clone());
        }
      }

      // the new coordinator is the first member of the consolidated & sorted membership list
      new_mbrs.sort();
      Address new_coord = new_mbrs.size() > 0 ? new_mbrs.elementAt(0) : null;
      if (new_coord == null) {
        if (log.isErrorEnabled()) log.error("new_coord == null");
        return null;
      }
      // should be the highest view ID seen up to now plus 1
      ViewId new_vid = new ViewId(new_coord, logical_time + 1);

      // determine the new view
      MergeView new_view = new MergeView(new_vid, new_mbrs.getMembers(), subgroups);

      // determine the new digest
      Digest new_digest = consolidateDigests(merge_rsps, new_mbrs.size());
      if (new_digest == null) {
        if (log.isErrorEnabled())
          log.error("Merge leader " + gms.local_addr + ": could not consolidate digest for merge");
        return null;
      }
      if (log.isDebugEnabled())
        log.debug(
            "Merge leader "
                + gms.local_addr
                + ": consolidated view="
                + new_view
                + "\nconsolidated digest="
                + new_digest);
      return new MergeData(gms.local_addr, new_view, new_digest);
    }
예제 #3
0
파일: Merger.java 프로젝트: wburns/JGroups
    /**
     * Merge all MergeData. All MergeData elements should be disjunct (both views and digests).
     * However, this method is prepared to resolve duplicate entries (for the same member).
     * Resolution strategy for views is to merge only 1 of the duplicate members. Resolution
     * strategy for digests is to take the higher seqnos for duplicate digests.
     *
     * <p>After merging all members into a Membership and subsequent sorting, the first member of
     * the sorted membership will be the new coordinator. This method has a lock on merge_rsps.
     *
     * @param merge_rsps A list of MergeData items. Elements with merge_rejected=true were removed
     *     before. Is guaranteed not to be null and to contain at least 1 member.
     */
    private MergeData consolidateMergeData(List<MergeData> merge_rsps) {
      long logical_time = 0; // for new_vid
      List<View> subgroups =
          new ArrayList<View>(11); // contains a list of Views, each View is a subgroup
      Collection<Collection<Address>> sub_mbrships = new ArrayList<Collection<Address>>();

      for (MergeData tmp_data : merge_rsps) {
        View tmp_view = tmp_data.getView();
        if (tmp_view != null) {
          ViewId tmp_vid = tmp_view.getVid();
          if (tmp_vid != null) {
            // compute the new view id (max of all vids +1)
            logical_time = Math.max(logical_time, tmp_vid.getId());
          }
          // merge all membership lists into one (prevent duplicates)
          sub_mbrships.add(new ArrayList<Address>(tmp_view.getMembers()));
          subgroups.add(tmp_view.copy());
        }
      }

      // determine the new digest
      Digest new_digest = consolidateDigests(merge_rsps, merge_rsps.size());
      if (new_digest == null) return null;

      // remove all members from the new member list that are not in the digest
      Collection<Address> digest_mbrs = new_digest.getMembers();
      for (Collection<Address> coll : sub_mbrships) coll.retainAll(digest_mbrs);

      List<Address> merged_mbrs = gms.computeNewMembership(sub_mbrships);

      // the new coordinator is the first member of the consolidated & sorted membership list
      Address new_coord = merged_mbrs.isEmpty() ? null : merged_mbrs.get(0);
      if (new_coord == null) return null;

      // should be the highest view ID seen up to now plus 1
      ViewId new_vid = new ViewId(new_coord, logical_time + 1);

      // determine the new view
      MergeView new_view = new MergeView(new_vid, merged_mbrs, subgroups);

      if (log.isTraceEnabled())
        log.trace(
            gms.local_addr
                + ": consolidated view="
                + new_view
                + "\nconsolidated digest="
                + new_digest);
      return new MergeData(gms.local_addr, new_view, new_digest);
    }
예제 #4
0
 /**
  * Removes all members from a given view which don't have us in their view
  * (https://jira.jboss.org/browse/JGRP-1061). Example:
  *
  * <pre>
  * A: AB
  * B: AB
  * C: ABC
  * </pre>
  *
  * becomes
  *
  * <pre>
  * A: AB
  * B: AB
  * C: C // A and B don't have C in their views
  * </pre>
  *
  * @param map A map of members and their associated views
  */
 public static void sanitizeViews(Map<Address, View> map) {
   if (map == null) return;
   for (Map.Entry<Address, View> entry : map.entrySet()) {
     Address key = entry.getKey();
     Collection<Address> members = new ArrayList<Address>(entry.getValue().getMembers());
     boolean modified = false;
     for (Iterator<Address> it = members.iterator(); it.hasNext(); ) {
       Address val = it.next();
       if (val.equals(key)) // we can always talk to ourself !
       continue;
       View view = map.get(val);
       final Collection<Address> tmp_mbrs = view != null ? view.getMembers() : null;
       if (tmp_mbrs != null && !tmp_mbrs.contains(key)) {
         it.remove();
         modified = true;
       }
     }
     if (modified) {
       View old_view = entry.getValue();
       entry.setValue(new View(old_view.getVid(), members));
     }
   }
 }
예제 #5
0
파일: GMS.java 프로젝트: jtoerber/JGroups
  /**
   * Sets the new view and sends a VIEW_CHANGE event up and down the stack. If the view is a
   * MergeView (subclass of View), then digest will be non-null and has to be set before installing
   * the view.
   */
  public void installView(View new_view, Digest digest) {
    ViewId vid = new_view.getVid();
    List<Address> mbrs = new_view.getMembers();
    ltime =
        Math.max(
            vid.getId(),
            ltime); // compute the logical time, regardless of whether the view is accepted

    // Discards view with id lower than or equal to our own. Will be installed without check if it
    // is the first view
    if (view != null) {
      ViewId view_id = view.getViewId();
      int rc = vid.compareToIDs(view_id);
      if (rc <= 0) {
        if (log.isWarnEnabled()
            && rc < 0
            && log_view_warnings) { // only scream if view is smaller, silently discard same views
          log.warn(
              local_addr
                  + ": received view < current view;"
                  + " discarding it (current vid: "
                  + view_id
                  + ", new vid: "
                  + vid
                  + ')');
        }
        return;
      }
    }

    /* Check for self-inclusion: if I'm not part of the new membership, I just discard it.
    This ensures that messages sent in view V1 are only received by members of V1 */
    if (!mbrs.contains(local_addr)) {
      if (log.isWarnEnabled() && log_view_warnings)
        log.warn(local_addr + ": not member of view " + new_view.getViewId() + "; discarding it");
      return;
    }

    if (digest != null) {
      if (new_view instanceof MergeView) mergeDigest(digest);
      else setDigest(digest);
    }

    if (log.isDebugEnabled()) log.debug(local_addr + ": installing view " + new_view);

    Event view_event;
    synchronized (members) {
      view = new View(new_view.getVid(), new_view.getMembers());
      view_event = new Event(Event.VIEW_CHANGE, new_view);

      // Set the membership. Take into account joining members
      if (!mbrs.isEmpty()) {
        members.set(mbrs);
        tmp_members.set(members);
        joining.removeAll(mbrs); // remove all members in mbrs from joining
        // remove all elements from 'leaving' that are not in 'mbrs'
        leaving.retainAll(mbrs);

        tmp_members.add(joining); // add members that haven't yet shown up in the membership
        tmp_members.remove(
            leaving); // remove members that haven't yet been removed from the membership

        // add to prev_members
        for (Address addr : mbrs) {
          if (!prev_members.contains(addr)) prev_members.add(addr);
        }
      }

      Address coord = determineCoordinator();
      if (coord != null && coord.equals(local_addr) && !haveCoordinatorRole()) {
        becomeCoordinator();
      } else {
        if (haveCoordinatorRole() && !local_addr.equals(coord)) {
          becomeParticipant();
          merge_ack_collector.reset(null); // we don't need this one anymore
        }
      }
    }

    // - Changed order of passing view up and down (http://jira.jboss.com/jira/browse/JGRP-347)
    // - Changed it back (bela Sept 4 2007): http://jira.jboss.com/jira/browse/JGRP-564
    // - Moved sending up view_event out of the synchronized block (bela Nov 2011)
    down_prot.down(view_event); // needed e.g. by failure detector or UDP
    up_prot.up(view_event);

    List<Address> tmp_mbrs = new_view.getMembers();
    ack_collector.retainAll(tmp_mbrs);
    merge_ack_collector.retainAll(tmp_mbrs);

    if (new_view instanceof MergeView) merger.forceCancelMerge();

    if (stats) {
      num_views++;
      prev_views.add(new Tuple<View, Long>(new_view, System.currentTimeMillis()));
    }
  }
예제 #6
0
파일: GMS.java 프로젝트: jtoerber/JGroups
  /**
   * Broadcasts the new view and digest, and waits for acks from all members in the list given as
   * argument. If the list is null, we take the members who are part of new_view
   */
  public void castViewChange(
      View new_view, Digest digest, JoinRsp jr, Collection<Address> newMembers) {
    if (log.isTraceEnabled())
      log.trace(local_addr + ": mcasting view " + new_view + " (" + new_view.size() + " mbrs)\n");

    // Send down a local TMP_VIEW event. This is needed by certain layers (e.g. NAKACK) to compute
    // correct digest
    // in case client's next request (e.g. getState()) reaches us *before* our own view change
    // multicast.
    // Check NAKACK's TMP_VIEW handling for details
    down_prot.up(new Event(Event.TMP_VIEW, new_view));
    down_prot.down(new Event(Event.TMP_VIEW, new_view));

    List<Address> ackMembers = new ArrayList<Address>(new_view.getMembers());
    if (newMembers != null && !newMembers.isEmpty()) ackMembers.removeAll(newMembers);

    Message view_change_msg = new Message(); // bcast to all members
    GmsHeader hdr = new GmsHeader(GmsHeader.VIEW, new_view);
    hdr.my_digest = digest;
    view_change_msg.putHeader(this.id, hdr);

    // If we're the only member the VIEW is broadcast to, let's simply install the view directly,
    // without
    // sending the VIEW multicast ! Or else N-1 members drop the multicast anyway...
    if (local_addr != null && ackMembers.size() == 1 && ackMembers.get(0).equals(local_addr)) {
      // we need to add the message to the retransmit window (e.g. in NAKACK), so (1) it can be
      // retransmitted and
      // (2) we increment the seqno (otherwise, we'd return an incorrect digest)
      down_prot.down(new Event(Event.ADD_TO_XMIT_TABLE, view_change_msg));
      impl.handleViewChange(new_view, digest);
    } else {
      if (!ackMembers.isEmpty()) ack_collector.reset(ackMembers);

      down_prot.down(new Event(Event.MSG, view_change_msg));
      try {
        if (!ackMembers.isEmpty()) {
          ack_collector.waitForAllAcks(view_ack_collection_timeout);
          if (log.isTraceEnabled())
            log.trace(
                local_addr
                    + ": received all "
                    + ack_collector.expectedAcks()
                    + " ACKs from members for view "
                    + new_view.getVid());
        }
      } catch (TimeoutException e) {
        if (log_collect_msgs && log.isWarnEnabled()) {
          log.warn(
              local_addr
                  + ": failed to collect all ACKs (expected="
                  + ack_collector.expectedAcks()
                  + ") for view "
                  + new_view.getViewId()
                  + " after "
                  + view_ack_collection_timeout
                  + "ms, missing ACKs from "
                  + ack_collector.printMissing());
        }
      }
    }

    if (jr != null && (newMembers != null && !newMembers.isEmpty())) {
      ack_collector.reset(new ArrayList<Address>(newMembers));
      for (Address joiner : newMembers) {
        sendJoinResponse(jr, joiner);
      }
      try {
        ack_collector.waitForAllAcks(view_ack_collection_timeout);
        if (log.isTraceEnabled())
          log.trace(
              local_addr
                  + ": received all ACKs ("
                  + ack_collector.expectedAcks()
                  + ") from joiners for view "
                  + new_view.getVid());
      } catch (TimeoutException e) {
        if (log_collect_msgs && log.isWarnEnabled()) {
          log.warn(
              local_addr
                  + ": failed to collect all ACKs (expected="
                  + ack_collector.expectedAcks()
                  + ") for unicast view "
                  + new_view
                  + " after "
                  + view_ack_collection_timeout
                  + "ms, missing ACKs from "
                  + ack_collector.printMissing());
        }
      }
    }
  }