@GridInternal public class CheckCpHistTask extends ComputeTaskAdapter<Map<UUID,Map<Integer,Set<Integer>>>,Boolean>
Modifier and Type | Field and Description |
---|---|
static String |
CP_REASON
Reason of checkpoint, which can be triggered by this task.
|
Constructor and Description |
---|
CheckCpHistTask() |
Modifier and Type | Method and Description |
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Map<org.apache.ignite.internal.CheckCpHistTask.CheckCpHistClosureJob,ClusterNode> |
map(List<ClusterNode> subgrid,
Map<UUID,Map<Integer,Set<Integer>>> arg)
This method is called to map or split grid task into multiple grid jobs.
|
Boolean |
reduce(List<ComputeJobResult> results)
Reduces (or aggregates) results received so far into one compound result to be returned to
caller via
ComputeTaskFuture.get() method. |
ComputeJobResultPolicy |
result(ComputeJobResult res,
List<ComputeJobResult> rcvd)
Default implementation which will wait for all jobs to complete before
calling
ComputeTask.reduce(List) method. |
public static final String CP_REASON
public Map<org.apache.ignite.internal.CheckCpHistTask.CheckCpHistClosureJob,ClusterNode> map(List<ClusterNode> subgrid, Map<UUID,Map<Integer,Set<Integer>>> arg) throws IgniteException
subgrid
- Nodes available for this task execution. Note that order of nodes is
guaranteed to be randomized by container. This ensures that every time
you simply iterate through grid nodes, the order of nodes will be random which
over time should result into all nodes being used equally.arg
- Task execution argument. Can be null
. This is the same argument
as the one passed into Grid#execute(...)
methods.ComputeTaskContinuousMapper
is
injected into task, if null
or empty map is returned, exception will be thrown.IgniteException
- If mapping could not complete successfully. This exception will be
thrown out of ComputeTaskFuture.get()
method.public ComputeJobResultPolicy result(ComputeJobResult res, List<ComputeJobResult> rcvd) throws IgniteException
ComputeTask.reduce(List)
method.
If remote job resulted in exception (ComputeJobResult.getException()
is not null
),
then ComputeJobResultPolicy.FAILOVER
policy will be returned if the exception is instance
of ClusterTopologyException
or ComputeExecutionRejectedException
, which means that
remote node either failed or job execution was rejected before it got a chance to start. In all
other cases the exception will be rethrown which will ultimately cause task to fail.
result
in interface ComputeTask<Map<UUID,Map<Integer,Set<Integer>>>,Boolean>
result
in class ComputeTaskAdapter<Map<UUID,Map<Integer,Set<Integer>>>,Boolean>
res
- Received remote grid executable result.rcvd
- All previously received results.IgniteException
- If handling a job result caused an error effectively rejecting
a failover. This exception will be thrown out of ComputeTaskFuture.get()
method.public Boolean reduce(List<ComputeJobResult> results) throws IgniteException
ComputeTaskFuture.get()
method.
Note, that if some jobs did not succeed and could not be failed over then the list of results passed into this method will include the failed results. Otherwise, failed results will not be in the list.
results
- Received results of broadcasted remote executions. Note that if task class has
ComputeTaskNoResultCache
annotation, then this list will be empty.IgniteException
- If reduction or results caused an error. This exception will
be thrown out of ComputeTaskFuture.get()
method.
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Ignite Database and Caching Platform : ver. 2.10.0 Release Date : March 10 2021