org.apache.hadoop.hive.metastore.txn.retry

Enum RetryPropagation

java.lang.Object

java.lang.Enum<RetryPropagation>

org.apache.hadoop.hive.metastore.txn.retry.RetryPropagation

All Implemented Interfaces:

Serializable, Comparable<RetryPropagation>

public enum RetryPropagation
extends Enum<RetryPropagation>

Specifies how the Retry context propagation is done in various situations.

Enum Constant Summary

Enum Constants

Enum Constant and Description
CREATE_OR_JOIN If there is no retry-call upper in the callstack, the SqlRetry annotated method will be executed as a retry-call, meaning that in case of SQL related errors, the method will be re-executed.
CREATE_OR_NESTED Regardless if there is a retry-call upper in the callstack, the SqlRetry annotated method will be executed as a retry-call, meaning that in case of SQL related errors, the method will be re-executed.
JOIN_EXISTING An existing retry-call is required to join it.

Method Summary

Modifier and Type	Method and Description
static RetryPropagation	valueOf(String name) Returns the enum constant of this type with the specified name.
static RetryPropagation[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

CREATE_OR_JOIN

public static final RetryPropagation CREATE_OR_JOIN

If there is no retry-call upper in the callstack, the SqlRetry annotated method will be executed as a retry-call, meaning that in case of SQL related errors, the method will be re-executed. If there is an existing retry-call method upper in the callstack (a method also annotated with theSqlRetry annotation), this method will join it. Joining the retry-call means that if this method fails, the fail will be propagated to the method upper in the callstack and that method will be retried (and this method will be retried as a part of that retry). In other words: regardless if the inner or outer method fails, the outer method will be re-executed.

CREATE_OR_NESTED

public static final RetryPropagation CREATE_OR_NESTED

Regardless if there is a retry-call upper in the callstack, the SqlRetry annotated method will be executed as a retry-call, meaning that in case of SQL related errors, the method will be re-executed. In other words: If the method fails, the error will be caught, and the method will be re-executed. If there is another retry-call upper in the callstack, this error remains unkown for it, unless all retry attempt are used up.

JOIN_EXISTING

public static final RetryPropagation JOIN_EXISTING

An existing retry-call is required to join it. In other words: While this method does not being executed as a retry-call, it can be called only when there is a SqlRetry annotated method upper in the callstack.

Method Detail

values

public static RetryPropagation[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (RetryPropagation c : RetryPropagation.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static RetryPropagation valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null