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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/09/11 11:37:00 UTC
[jira] [Work logged] (BEAM-9399) Possible deadlock between
DataflowWorkerLoggingHandler and overridden System.err PrintStream
[ https://issues.apache.org/jira/browse/BEAM-9399?focusedWorklogId=482023&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-482023 ]
ASF GitHub Bot logged work on BEAM-9399:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Sep/20 11:36
Start Date: 11/Sep/20 11:36
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #12825:
URL: https://github.com/apache/beam/pull/12825
…he original System.err
Currently such errors are logged to System.err which is a PrintStream that
publishes to the handler. This is perhaps unlikely to work if earlier publishing
failed and additionally removes a potential deadlock between the PrintStream
object sychronization and the Handler object synchronization. This was attempted
to be fixed earlier by dissallowing the PrintStream object to be synchronized
when calling into the handler. However this is possible to be triggered by
external synchronization on the PrintStream, such as that performed by
Throwable.printStackTrace. Changing the PrintStream to use separate synchronization
for buffering works in most cases but not for cases where the stream is externally
synchronized.
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Issue Time Tracking
-------------------
Worklog Id: (was: 482023)
Time Spent: 6h 10m (was: 6h)
> Possible deadlock between DataflowWorkerLoggingHandler and overridden System.err PrintStream
> --------------------------------------------------------------------------------------------
>
> Key: BEAM-9399
> URL: https://issues.apache.org/jira/browse/BEAM-9399
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P3
> Fix For: 2.21.0
>
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> When an exception is encountered in DataflowWorkerLoggingHandler the ErrorManager is used to log the exception. ErrorManager uses System.err which is overridden to be a PrintStream that writes back into DataflowWorkerLoggingHandler.
> This has the lock ordering DataflowWorkerLoggingHandler -> PrintStream.
> Other logging of System.err has the inverse lock ordering PrintStream->DataflowWorkerLoggingHandler so there is potential for deadlock.
> This is one known cause of the inversion, but any other System.err logs from inside DataflowWorkerLoggingHandler could cause the same issue.
> Proposed fix is to address low-hanging fruit of having ErrorManager output to the original System.err. A full fix would be to improve our override of System.err to a PrintStream that can detect the locking inversion or possibly we could use the PrintStream mutex in both cases.
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