fix: retry 404 errors in Client.query(...)
#2135
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| if job_retry is None: | ||
| future = do_query() | ||
| else: | ||
| future = job_retry(do_query)() |
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Note: even though I add the retry here, we'll still need the one in QueryJob, because BigQuery queries can be started successfully but still fail for a retriablle reason. By adding the retry here, we can retry the queries that fail for a retriable reason.
google/cloud/bigquery/retry.py
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| # Per https://github.com/googleapis/python-bigquery/issues/2134, sometimes | ||
| # we get a 404 error. In this case, if we get this far, assume that the job | ||
| # doesn't actually exist and try again. | ||
| or isinstance(exc, exceptions.NotFound) |
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Thought: Does this make it so that the queries retry if the table is not found? Or is this only going to happen for query job not found.
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😢 It does hang / retry too much. Tested with
import google.cloud.bigquery
client = google.cloud.bigquery.Client()
job = client.query("SELECT * FROM `swast-scratch.my_dataset.doesntexistnoreally`")
job.result()Need to play a similar trick as with get_job_retry, instead.
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Fixed in latest commit.
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I confirmed with my colleague that after at |
| get_job_retry = retry.with_predicate( | ||
| lambda exc: isinstance(exc, core_exceptions.NotFound) | ||
| # Reference the original retry to avoid recursion. | ||
| or retry._predicate(exc) |
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@parthea Do you have any thoughts on how stable this will be? I couldn't find any public way to pull out the previous predicate from a Retry object when looking at the https://github.com/googleapis/python-api-core/blob/main/google/api_core/retry/retry_base.py code.
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An alternative to consider: do something like I did with retry versus job_retry and introduce more parameters for job_insert_retry and job_get_retry or something like that.
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Filed googleapis/python-api-core#796, in the meantime I'll pursue an alternative that doesn't require access to private attributes.
| return True | ||
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| # Reference the original job_retry to avoid recursion. | ||
| return job_retry._predicate(exc) |
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@parthea likewise here. I ended up using a slightly different pattern here due to the double nesting of retry objects.
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system-3.12 failure: Edit: Actually, it does appear to be related. It's a different kind of 404 -- trying to query a table in a different location. I'll see if I can disambiguate that from the job 404. Edit2: fixed in 8e20cb0. I use the message to disambiguate job not found from dataset/table not found based on the stack trace in #2134. System test passing locally (and much more quickly). |
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Kokoro (https://btx.cloud.google.com/invocations/91aed90f-987e-4200-be14-09717b48923f/targets/cloud-devrel%2Fclient-libraries%2Fpython%2Fgoogleapis%2Fpython-bigquery%2Fpresubmit%2Fpresubmit/log) and system-3.12 and snippets tests are passing. Ready for review! |
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Cover is failing: I'll see if I can update a unit test for this soon. |
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Fixes #2134 🦕