org.apache.hadoop.hbase.client

接口 RetryingCallable<T>

类型参数:

T - result class from executing this

所有已知实现类:

DelegatingRetryingCallable, FlushRegionCallable, PayloadCarryingServerCallable, RegionAdminServiceCallable, RegionServerCallable, ReversedScannerCallable, ScannerCallable

@InterfaceAudience.Private
public interface RetryingCallable<T>

A Callable<T> that will be retried. If call(int) invocation throws exceptions, we will call throwable(Throwable, boolean) with whatever the exception was.

方法概要

方法

限定符和类型	方法和说明
T	call(int callTimeout) Computes a result, or throws an exception if unable to do so.
String	getExceptionMessageAdditionalDetail()
void	prepare(boolean reload) Prepare by setting up any connections to servers, etc., ahead of call(int) invocation.
long	sleep(long pause, int tries)
void	throwable(Throwable t, boolean retrying) Called when call(int) throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).

方法详细资料

prepare

void prepare(boolean reload)
             throws IOException

Prepare by setting up any connections to servers, etc., ahead of call(int) invocation.

参数:

reload - Set this to true if need to requery locations

抛出:

IOException - e

throwable

void throwable(Throwable t,
             boolean retrying)

Called when call(int) throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).

参数:

t -

retrying - True if we are in retrying mode (we are not in retrying mode when max retries == 1; we ARE in retrying mode if retries > 1 even when we are the last attempt)

call

T call(int callTimeout)
       throws Exception

Computes a result, or throws an exception if unable to do so.

参数:

callTimeout - - the time available for this call. 0 for infinite.

返回:

computed result

抛出:

Exception - if unable to compute a result

getExceptionMessageAdditionalDetail

String getExceptionMessageAdditionalDetail()

返回:

Some details from the implementation that we would like to add to a terminating exception; i.e. a fatal exception is being thrown ending retries and we might like to add more implementation-specific detail on to the exception being thrown.

sleep

long sleep(long pause,
         int tries)

参数:

pause -

tries -

返回:

Suggestion on how much to sleep between retries