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https://issues.apache.org/jira/browse/BEAM-9399?focusedWorklogId=401074&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-401074
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ASF GitHub Bot logged work on BEAM-9399:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Mar/20 00:14
Start Date: 11/Mar/20 00:14
Worklog Time Spent: 10m
Work Description: scwhittle commented on pull request #11096: [BEAM-9399]
Change the redirection of System.err to be a custom PrintStream
URL: https://github.com/apache/beam/pull/11096
This replaces the current implementation of a custom output stream wrapped
by standard PrintStream, removing a possible deadlock between the PrintStream
and handler. The
deadlock can occur if something beneath the handler lock attempts to use
System.err, reversing
the normal locking order.
By using PrintStream we can use a StringBuffer instead of a ByteBuffer,
which also avoids extra encoding and decoding between byte arrays and Strings.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 401074)
Remaining Estimate: 0h
Time Spent: 10m
> 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: Minor
> Time Spent: 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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