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Posted to issues@flink.apache.org by "zhijiang (JIRA)" <ji...@apache.org> on 2018/06/27 09:49:00 UTC
[jira] [Updated] (FLINK-9676) Deadlock during canceling task and
recycling exclusive buffer
[ https://issues.apache.org/jira/browse/FLINK-9676?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
zhijiang updated FLINK-9676:
----------------------------
Description:
It may cause deadlock between task canceler thread and task thread.
The detail is as follows:
Task canceler thread -> IC1#releaseAllResources -> recycle floating buffers -> {color:#d04437}lock{color} (LocalBufferPool#availableMemorySegments) -> IC2#notifyBufferAvailable ->{color:#ff0000} {color}{{{color:#ff0000}try to lock{color}}}{{(IC2#bufferQueue)}}
{{Task thread -> IC2#recycle -> lock(IC2#bufferQueue) -> bufferQueue#addExclusiveBuffer}} -> {{floatingBuffer#recycleBuffer}} -> {color:#d04437}try to lock{color}(LocalBufferPool#availableMemorySegments)
One solution is that {{listener#notifyBufferAvailable}} can be called outside the {{synchronized(availableMemorySegments) in }}{{LocalBufferPool#recycle.}}
was:
It may cause deadlock between task canceler thread and task thread.
The detail is as follows:
Task canceler thread -> {{IC1#releaseAllResources}} -> recycle floating buffers -> {color:#FF0000}lock{color} ({{LocalBufferPool#availableMemorySegments) -> }}{{IC2#notifyBufferAvailable}}{{ -> {color:#FF0000}try to lock{color:#333333}({color}{color}}}{{IC2#bufferQueue)}}
{{Task thread -> IC2#recycle -> {color:#d04437}lock{color}(IC2#bufferQueue) -> }}{{bufferQueue#addExclusiveBuffer}} -> {{floatingBuffer#recycleBuffer}} -> {color:#d04437}try to lock{color}(LocalBufferPool#availableMemorySegments)
One solution is that {{listener#notifyBufferAvailable}} can be called outside the {{synchronized(availableMemorySegments) in }}{{LocalBufferPool#recycle.}}{{}}
> Deadlock during canceling task and recycling exclusive buffer
> -------------------------------------------------------------
>
> Key: FLINK-9676
> URL: https://issues.apache.org/jira/browse/FLINK-9676
> Project: Flink
> Issue Type: Bug
> Components: Network
> Affects Versions: 1.5.0
> Reporter: zhijiang
> Priority: Major
> Fix For: 1.5.1
>
>
> It may cause deadlock between task canceler thread and task thread.
> The detail is as follows:
> Task canceler thread -> IC1#releaseAllResources -> recycle floating buffers -> {color:#d04437}lock{color} (LocalBufferPool#availableMemorySegments) -> IC2#notifyBufferAvailable ->{color:#ff0000} {color}{{{color:#ff0000}try to lock{color}}}{{(IC2#bufferQueue)}}
> {{Task thread -> IC2#recycle -> lock(IC2#bufferQueue) -> bufferQueue#addExclusiveBuffer}} -> {{floatingBuffer#recycleBuffer}} -> {color:#d04437}try to lock{color}(LocalBufferPool#availableMemorySegments)
> One solution is that {{listener#notifyBufferAvailable}} can be called outside the {{synchronized(availableMemorySegments) in }}{{LocalBufferPool#recycle.}}
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