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ASF GitHub Bot logged work on BEAM-10166: ----------------------------------------- Author: ASF GitHub Bot Created on: 06/Jul/20 20:46 Start Date: 06/Jul/20 20:46 Worklog Time Spent: 10m Work Description: lostluck commented on pull request #12170: URL: https://github.com/apache/beam/pull/12170#issuecomment-654456518 This is a good first step! Next up is adding it for use in user error returns in exec/pardo.go and similar. If you did that work already, it's probable that the commit wasn't pushed to your branch. Thanks for your patience in my getting to this. I took a long weekend for the US (and Canadian) holiday, and avoided all pretense of work. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 455080) Time Spent: 1h 20m (was: 1h 10m) > Improve execution time errors > ----------------------------- > > Key: BEAM-10166 > URL: https://issues.apache.org/jira/browse/BEAM-10166 > Project: Beam > Issue Type: Improvement > Components: sdk-go > Reporter: Robert Burke > Assignee: Aaron Tillekeratne > Priority: P3 > Labels: beginner, n00b, starter > Time Spent: 1h 20m > Remaining Estimate: 0h > > The Go SDK uses errors returned by DoFns to signal failures to process > bundles, and terminate bundle processing. However, if the preceding DoFn uses > emitters, rather than error returns, the code has no choice to panic to avoid > user code handling or ignoring the cross DoFn error (which could cause > dataloss or other correctness problems). > All bundle executions are wrapped in > `[callNoPanic|https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/util.go#L37]` > to prevent worker termination on such panics, and orderly terminate just the > affected bundle instead.`callNoPanic` uses Go's built in recover mechanism to > get the error and provide a stack trace. > We can do better. > The value returned by recover is just an interface{} which means we could > detect the specific type of error it is. In particular, we could have the > exec package have an error that we can detect. If the recovered value is that > error, then we could use that to provide a clearer error message than a > panic stack trace. > Such an error wrapper would contain: the error in question, the user DoFn > that caused it, the debug id of the DoFn node (To be able to relate it back > to the plan.) > See https://gobyexample.com/errors and [other articles on creating custom > errors in > Go|https://www.digitalocean.com/community/tutorials/creating-custom-errors-in-go]. > It doesn't need to be complicated. > Then in `callNoPanic` we could detect this error wrapper and produce a > clearer error message based on the existing plan. If not, we can maintain the > current behavior. This latter part is necessary to handle panics originating > in user code. > To avoid mistaken user use which would breach this protocol, we're best off > keeping the wrapper unexported from the exec package. -- This message was sent by Atlassian Jira (v8.3.4#803005)