[IMPALA-6346] Potential deadlock in KrpcDataStreamMgr

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.11.0
• Fix Version/s: Impala 2.12.0
• Component/s: Distributed Exec
• Labels: deadlock
• Target Version: Impala 2.12.0
• Epic Color: ghx-label-6
• Assignee: Sailesh Mukil
• Reporter: Lars Volker
• Created: 19/Dec/17 20:45
• Updated: 02/Feb/18 19:28
• Resolved: 02/Feb/18 19:28

Description

In KrpcDataStreamMgr::CreateRecvr() we take the lock_ and then call recvr->TakeOverEarlySender() for all contexts. recvr->TakeOverEarlySender() then calls recvr_->mgr_->EnqueueDeserializeTask((), which can block if the deserialize pool queue is full. The next thread to become available in that queue will also have to acquire lock_, thus leading to a deadlock.