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Active Failover Asynchronous driver (#381)
* fixed active failover communication in async driver * fixed active failover dirty read test * fixed active failover communication in async driver * fixed async StreamTransactionGraphTest * fixed race conditions at VST MessageStore.clear * enhanced VST connection debug logging * set default acquireHostList=true for tests * fixed race condition in ConnectionPool * added active-failover to GH actions * fixed some active-failover test failures * skipping getLogs test for ArangoDB <= 3.6 (BTS-362) * skipping getLogs test for ArangoDB <= 3.6 (BTS-362) * documented active failover acquireHostList and loadBalancingStrategy configuration * changelog upd
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‎.github/workflows/maven.yml‎

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@@ -42,6 +42,7 @@ jobs:
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topology:
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- single
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- cluster
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- active-failover
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steps:
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- uses: actions/checkout@v1

‎ChangeLog.md‎

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@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
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## [Unreleased]
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- fixed active failover behavior for the asynchronous driver
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## [6.10.0] - 2021-03-27
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- closing VST connection after 3 consecutive keepAlive failures (#ES-837)

‎docker/clean_active-failover.sh‎

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#!/bin/bash
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for c in server1 \
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server2 \
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server3; do
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docker rm -f $c
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done

‎docker/start_db_active-failover.sh‎

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#!/bin/bash
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# USAGE:
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# export ARANGO_LICENSE_KEY=<arangodb-enterprise-license>
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# ./start_active-failover.sh <dockerImage>
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# EXAMPLE:
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# ./start_active-failover.sh docker.io/arangodb/arangodb:3.7.10
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docker pull "$1"
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LOCATION=$(pwd)/$(dirname "$0")
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docker network create arangodb --subnet 172.28.0.0/16
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echo "Averysecretword" >"$LOCATION"/jwtSecret
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docker run --rm -v "$LOCATION"/jwtSecret:/jwtSecret "$1" arangodb auth header --auth.jwt-secret /jwtSecret >"$LOCATION"/jwtHeader
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AUTHORIZATION_HEADER=$(cat "$LOCATION"/jwtHeader)
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echo "Starting containers..."
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docker run -d -v "$LOCATION"/jwtSecret:/jwtSecret -e ARANGO_LICENSE_KEY="$ARANGO_LICENSE_KEY" --network arangodb --ip 172.28.3.1 --name server1 "$1" sh -c 'arangodb --starter.address=$(hostname -i) --starter.mode=activefailover --starter.join server1,server2,server3 --auth.jwt-secret /jwtSecret'
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docker run -d -v "$LOCATION"/jwtSecret:/jwtSecret -e ARANGO_LICENSE_KEY="$ARANGO_LICENSE_KEY" --network arangodb --ip 172.28.3.2 --name server2 "$1" sh -c 'arangodb --starter.address=$(hostname -i) --starter.mode=activefailover --starter.join server1,server2,server3 --auth.jwt-secret /jwtSecret'
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docker run -d -v "$LOCATION"/jwtSecret:/jwtSecret -e ARANGO_LICENSE_KEY="$ARANGO_LICENSE_KEY" --network arangodb --ip 172.28.3.3 --name server3 "$1" sh -c 'arangodb --starter.address=$(hostname -i) --starter.mode=activefailover --starter.join server1,server2,server3 --auth.jwt-secret /jwtSecret'
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debug_container() {
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running=$(docker inspect -f '{{.State.Running}}' "$1")
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if [ "$running" = false ]; then
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echo "$1 is not running!"
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echo "---"
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docker logs "$1"
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echo "---"
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exit 1
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fi
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}
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debug() {
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for c in server1 \
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server2 \
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server3; do
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debug_container $c
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done
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}
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wait_server() {
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# shellcheck disable=SC2091
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until $(curl --output /dev/null --silent --head --fail -i -H "$AUTHORIZATION_HEADER" "http://$1/_api/version"); do
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printf '.'
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debug
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sleep 1
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done
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}
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echo "Waiting..."
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# Wait for agents:
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for a in 172.28.3.1:8529 \
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172.28.3.2:8529 \
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172.28.3.3:8529; do
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wait_server $a
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done
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docker exec server1 arangosh --server.authentication=false --javascript.execute-string='require("org/arangodb/users").update("root", "test")'
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docker exec server2 arangosh --server.authentication=false --javascript.execute-string='require("org/arangodb/users").update("root", "test")'
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docker exec server3 arangosh --server.authentication=false --javascript.execute-string='require("org/arangodb/users").update("root", "test")'
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#rm "$LOCATION"/jwtHeader "$LOCATION"/jwtSecret
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echo "Done, your cluster is ready."

‎docker/start_db_active-failover_retry_fail.sh‎

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#!/bin/bash
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# USAGE:
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# export ARANGO_LICENSE_KEY=<arangodb-enterprise-license>
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# ./docker/start_db_active-failover_retry_fail.sh <dockerImage>
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# EXAMPLE:
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# ./docker/start_db_active-failover_retry_fail.sh docker.io/arangodb/arangodb:3.7.10
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./docker/start_db_active-failover.sh "$1"
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while [ $? -ne 0 ]; do
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echo "=== === ==="
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echo "active-failover startup failed, retrying ..."
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./docker/clean_active-failover.sh
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./docker/start_db_active-failover.sh "$1"
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done

‎src/main/java/com/arangodb/ArangoDB.java‎

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/**
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* Whether or not the driver should acquire a list of available coordinators in an ArangoDB cluster or a single
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* server with active failover.
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* In case of Active-Failover deployment set to {@code true} to enable automatic master discovery.
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*
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* <p>
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* The host list will be used for failover and load balancing.
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/**
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* Sets the load balancing strategy to be used in an ArangoDB cluster setup.
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* In case of Active-Failover deployment set to {@link LoadBalancingStrategy#NONE} or not set at all, since that
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* would be the default.
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*
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* @param loadBalancingStrategy the load balancing strategy to be used (default: {@link LoadBalancingStrategy#NONE}
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* @return {@link ArangoDB.Builder}

‎src/main/java/com/arangodb/async/ArangoDBAsync.java‎

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/**
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* Whether or not the driver should acquire a list of available coordinators in an ArangoDB cluster or a single
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* server with active failover.
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* In case of Active-Failover deployment set to {@code true} to enable automatic master discovery.
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*
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* <p>
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* The host list will be used for failover and load balancing.
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/**
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* Sets the load balancing strategy to be used in an ArangoDB cluster setup.
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* In case of Active-Failover deployment set to {@link LoadBalancingStrategy#NONE} or not set at all, since that
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* would be the default.
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*
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* @param loadBalancingStrategy the load balancing strategy to be used (default: {@link LoadBalancingStrategy#NONE}
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* @return {@link ArangoDBAsync.Builder}

‎src/main/java/com/arangodb/async/internal/velocystream/VstCommunicationAsync.java‎

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package com.arangodb.async.internal.velocystream;
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import com.arangodb.ArangoDBException;
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import com.arangodb.entity.ErrorEntity;
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import com.arangodb.internal.net.ArangoDBRedirectException;
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import com.arangodb.internal.net.HostDescription;
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import com.arangodb.internal.net.HostHandle;
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import com.arangodb.internal.net.HostHandler;
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import com.arangodb.internal.util.HostUtils;
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import com.arangodb.internal.velocystream.VstCommunication;
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import com.arangodb.internal.velocystream.internal.AuthenticationRequest;
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import com.arangodb.internal.velocystream.internal.Message;
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final Message message = createMessage(request);
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send(message, connection).whenComplete((m, ex) -> {
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if (m != null) {
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final Response response;
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try {
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final Response response = createResponse(m);
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if (response.getResponseCode() >= 300) {
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if (response.getBody() != null) {
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final ErrorEntity errorEntity = util.deserialize(response.getBody(), ErrorEntity.class);
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rfuture.completeExceptionally(new ArangoDBException(errorEntity));
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} else {
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rfuture.completeExceptionally(new ArangoDBException(
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String.format("Response Code: %s", response.getResponseCode()), response.getResponseCode()));
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}
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} else {
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rfuture.complete(response);
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}
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response = createResponse(m);
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} catch (final VPackParserException e) {
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LOGGER.error(e.getMessage(), e);
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rfuture.completeExceptionally(e);
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return;
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}
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try {
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checkError(response);
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} catch (final ArangoDBRedirectException e) {
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final String location = e.getLocation();
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final HostDescription redirectHost = HostUtils.createFromLocation(location);
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hostHandler.closeCurrentOnError();
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hostHandler.fail();
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execute(request, new HostHandle().setHost(redirectHost))
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.whenComplete((v, err) -> {
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if (v != null) {
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rfuture.complete(v);
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} else if (err != null) {
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rfuture.completeExceptionally(err);
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} else {
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rfuture.cancel(true);
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}
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});
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return;
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} catch (ArangoDBException e) {
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rfuture.completeExceptionally(e);
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}
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rfuture.complete(response);
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} else if (ex != null) {
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LOGGER.error(ex.getMessage(), ex);
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rfuture.completeExceptionally(ex);

‎src/main/java/com/arangodb/internal/net/ConnectionPoolImpl.java‎

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}
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@Override
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public void close() throws IOException {
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public synchronized void close() throws IOException {
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for (final Connection connection : connections) {
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connection.close();
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}

‎src/main/java/com/arangodb/internal/velocystream/VstCommunication.java‎

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import com.arangodb.ArangoDBException;
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import com.arangodb.internal.ArangoDefaults;
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import com.arangodb.internal.net.AccessType;
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import com.arangodb.internal.net.ArangoDBRedirectException;
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import com.arangodb.internal.net.Host;
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import com.arangodb.internal.net.HostDescription;
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import com.arangodb.internal.net.HostHandle;
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import com.arangodb.internal.net.HostHandler;
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import com.arangodb.internal.util.HostUtils;
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import com.arangodb.internal.util.RequestUtils;
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import com.arangodb.internal.util.ResponseUtils;
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import com.arangodb.internal.velocystream.internal.Chunk;
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protected final String password;
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protected final Integer chunksize;
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private final HostHandler hostHandler;
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protected final HostHandler hostHandler;
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protected VstCommunication(final Integer timeout, final String user, final String password, final Boolean useSsl,
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final SSLContext sslContext, final ArangoSerialization util, final Integer chunksize,
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}
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public R execute(final Request request, final HostHandle hostHandle) throws ArangoDBException {
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try {
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final C connection = connect(hostHandle, RequestUtils.determineAccessType(request));
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return execute(request, connection);
140-
} catch (final ArangoDBException e) {
141-
if (e instanceof ArangoDBRedirectException) {
142-
final String location = ((ArangoDBRedirectException) e).getLocation();
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final HostDescription redirectHost = HostUtils.createFromLocation(location);
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hostHandler.closeCurrentOnError();
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hostHandler.fail();
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return execute(request, new HostHandle().setHost(redirectHost));
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} else {
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throw e;
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}
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}
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final C connection = connect(hostHandle, RequestUtils.determineAccessType(request));
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return execute(request, connection);
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}
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protected abstract R execute(final Request request, C connection) throws ArangoDBException;

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