[infinispan-issues] [JBoss JIRA] (ISPN-8954) StateReceiverImpl should request segments via an executor

[Ryan Emerson (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-8954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on ISPN-8954 started by Ryan Emerson.
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> StateReceiverImpl should request segments via an executor
> ---------------------------------------------------------
>
>                 Key: ISPN-8954
>                 URL: https://issues.jboss.org/browse/ISPN-8954
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 9.2.0.Final
>            Reporter: Ryan Emerson
>            Assignee: Ryan Emerson
>             Fix For: 9.2.1.Final
>
>
> Currently when requesting segments an InboundTransferTask is executed in the thread calling StateReceiver::getAllReplicasForSegment. The problem with this is that InboundTransferTask::requestSegments is a blocking RPC call, which due to the synchronization used by a SegmentRequest object means that it's not possible for a segment request to be cancelled while an InboundTransferTask::requestSegment call is being executed. Furthermore, this situation is exasperated by the fact that currently the transfer tasks are created using the state transfer timeout (defualt is 4 mins), so it's possible for the calling thread to be blocked for this amount of time. 
> The solution is to utilise the StateTransferExecutor to process the InboundTransferTasks so that a segment request can be cancelled during a transfer request. Also, we should utilise the remaining time of the DefaultConflictManager::ReplicaSpliterator as the upper bound on the transfer tasks.



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