4.x: Introduce exponential retry backoff policy #483
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dkropachev
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Make driver wait before retry. It is needed to mitigate retry storms that can happen in certain cases.
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Documentation in multiple places is not adjusted to describe the new implementations. Often it refers to other existing classes or interfaces and does not list newly added params.
Is it necessary to introduce a new separate category of retry policies? I think from the user perspective it may be hard to understand how does the RetryPolicy interact with BackOffRetryPolicy.
Ideally the new retry policy should be just an implementation of RetryPolicy interface.
| /** The class of the retry policy. */ | ||
| public static final TypedDriverOption<String> BACKOFF_RETRY_POLICY_CLASS = | ||
| new TypedDriverOption<>(DefaultDriverOption.BACKOFF_RETRY_POLICY_CLASS, GenericType.STRING); | ||
| /** The class of the retry policy. */ | ||
| public static final TypedDriverOption<Integer> BACKOFF_RETRY_BASE_BACKOFF_MS = | ||
| new TypedDriverOption<>( | ||
| DefaultDriverOption.BACKOFF_RETRY_BASE_BACKOFF_MS, GenericType.INTEGER); | ||
| /** The class of the retry policy. */ | ||
| public static final TypedDriverOption<Integer> BACKOFF_RETRY_MAX_BACKOFF_MS = | ||
| new TypedDriverOption<>( | ||
| DefaultDriverOption.BACKOFF_RETRY_MAX_BACKOFF_MS, GenericType.INTEGER); | ||
| /** The class of the retry policy. */ | ||
| public static final TypedDriverOption<Double> BACKOFF_RETRY_JITTER_RATIO = | ||
| new TypedDriverOption<>(DefaultDriverOption.BACKOFF_RETRY_JITTER_RATIO, GenericType.DOUBLE); |
It is definitely easier, I will try to make it part of regular retry |
| startedSpeculativeExecutionsCount.incrementAndGet(); | ||
| // Note that `node` is the first node of the execution, it might not be the | ||
| // "slow" one if there were retries, but in practice retries are rare. |
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I don't understand why speculative executions count is increased here. Is this method only for SpecEx queries?
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Make driver wait before retry.
It is needed to mitigate retry storms that can happen in certain cases.
Fixes: #481