Examples with RaftTestUtil.waitForLeader org.apache.ratis.RaftTestUtil.waitForLeader used on opensource projects

Example 1 with RaftTestUtil.waitForLeader

use of org.apache.ratis.RaftTestUtil.waitForLeader in project incubator-ratis by apache.

the class RaftAsyncTests method testStaleReadAsync.

@Test
public void testStaleReadAsync() throws Exception {
    final int numMesssages = 10;
    final CLUSTER cluster = getFactory().newCluster(NUM_SERVERS, properties);
    try (RaftClient client = cluster.createClient()) {
        cluster.start();
        RaftTestUtil.waitForLeader(cluster);
        // submit some messages
        final List<CompletableFuture<RaftClientReply>> futures = new ArrayList<>();
        for (int i = 0; i < numMesssages; i++) {
            final String s = "m" + i;
            LOG.info("sendAsync " + s);
            futures.add(client.sendAsync(new RaftTestUtil.SimpleMessage(s)));
        }
        Assert.assertEquals(numMesssages, futures.size());
        RaftClientReply lastWriteReply = null;
        for (CompletableFuture<RaftClientReply> f : futures) {
            lastWriteReply = f.join();
            Assert.assertTrue(lastWriteReply.isSuccess());
        }
        futures.clear();
        // Use a follower with the max commit index
        final RaftPeerId leader = lastWriteReply.getServerId();
        LOG.info("leader = " + leader);
        final Collection<CommitInfoProto> commitInfos = lastWriteReply.getCommitInfos();
        LOG.info("commitInfos = " + commitInfos);
        final CommitInfoProto followerCommitInfo = commitInfos.stream().filter(info -> !RaftPeerId.valueOf(info.getServer().getId()).equals(leader)).max(Comparator.comparing(CommitInfoProto::getCommitIndex)).get();
        final RaftPeerId follower = RaftPeerId.valueOf(followerCommitInfo.getServer().getId());
        LOG.info("max follower = " + follower);
        // test a failure case
        testFailureCaseAsync("sendStaleReadAsync(..) with a larger commit index", () -> client.sendStaleReadAsync(new RaftTestUtil.SimpleMessage("" + (numMesssages + 1)), followerCommitInfo.getCommitIndex(), follower), StateMachineException.class, IndexOutOfBoundsException.class);
        // test sendStaleReadAsync
        for (int i = 1; i < followerCommitInfo.getCommitIndex(); i++) {
            final int query = i;
            LOG.info("sendStaleReadAsync, query=" + query);
            final Message message = new RaftTestUtil.SimpleMessage("" + query);
            final CompletableFuture<RaftClientReply> readFuture = client.sendReadOnlyAsync(message);
            final CompletableFuture<RaftClientReply> staleReadFuture = client.sendStaleReadAsync(message, followerCommitInfo.getCommitIndex(), follower);
            futures.add(readFuture.thenApply(r -> getMessageContent(r)).thenCombine(staleReadFuture.thenApply(r -> getMessageContent(r)), (expected, computed) -> {
                try {
                    LOG.info("query " + query + " returns " + LogEntryProto.parseFrom(expected).getSmLogEntry().getData().toStringUtf8());
                } catch (InvalidProtocolBufferException e) {
                    throw new CompletionException(e);
                }
                Assert.assertEquals("log entry mismatch for query=" + query, expected, computed);
                return null;
            }));
        }
        JavaUtils.allOf(futures).join();
    } finally {
        cluster.shutdown();
    }
}