public static final ConfigOption<Boolean> SPECULATIVE_EXECUTION_ENABLED =
        key("flink.batch.speculative.enabled")
                .booleanType()
                .defaultValue(false)
                .withDescription("Whether to enable speculation of batch job.");

public static final ConfigOption<Long> SPECULATIVE_EXECUTION_INTERVAL_IN_MILLIS =
        key("flink.batch.speculative.interval.in.millis")
                .longType()
                .defaultValue(100L)
                .withDescription("How often to check for speculative executions.");

public static final ConfigOption<Double> SPECULATIVE_EXECUTION_MULTIPLIER =
        key("flink.batch.speculative.multiplier")
                .doubleType()
                .defaultValue(1.5)
                .withDescription("When the running time of a unfinished executionVertex is several times of" +
                        " the median of all completed ExecutionVertexs, it will be speculated.");

public static final ConfigOption<Double> SPECULATIVE_EXECUTION_QUANTILE =
        key("flink.batch.speculative.quantile")
                .doubleType()
                .defaultValue(0.75)
                .withDescription("When the percentage of ExecutionVertex in an ExecutionJobVertex are finished," +
                        " the speculative execution mechanism will be started. 0.9 means that 90% of the" +
                        " ExecutionVertex are finished, then the speculative execution mechanism will be started.");

public static final ConfigOption<Double> SPECULATIVE_EXECUTION_COUNT =
        key("flink.batch.speculative.execution.count")
                .longType()
                .defaultValue(1)
                .withDescription("The number of speculative executions that existed in an ExecutionVertex simultaneously.");

public static final ConfigOption<Long> SPECULATIVE_EXECUTION_LOG_INTERVAL_IN_MILLIS =
        key("flink.batch.speculative.log.interval.in.millis")
                .longType()
                .defaultValue(1000 * 60 * 5L)
                .withDescription("Interval in millis for speculative related log.");

public static final ConfigOption<Boolean> FLINK_BLACKLIST_ENABLE =
        key("flink.blacklist.enable")
                .booleanType()
                .defaultValue(false)
                .withDescription("Whether to enable blacklist job.");

public static final ConfigOption<Long> FLINK_BLACKLIST_TIMEOUT_IN_MILLIS =
        key("flink.blacklist.timeout.in.millis")
                .longType()
                .defaultValue(60 * 1000L)
                .withDescription("Indicates how long a black list record will be removed after added to the blacklist.");