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From "Lars Volker (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4494: Fix crash in SimpleScheduler
Date Thu, 17 Nov 2016 18:09:38 GMT
Lars Volker has posted comments on this change.

Change subject: IMPALA-4494: Fix crash in SimpleScheduler

Patch Set 1:

Thanks for your feedback. I agree that this is not optimal, and if there was a way to send
the equivalent of EAGAIN to the client and make it try again either with this or a different
coordinator that could be a workaround. I'd also be happy to add a small timeout of a few
seconds before returning an error. I'm rather reluctant to change the way we register the
local backend with itself, since that way we will have two mechanisms of updating the membership
information and need to handle conflicts as well.

That being said, between a) Relying on the client to try again, b) waiting for 5 seconds (or
whatever value), and c) reworking the cluster membership information management code in the
scheduler, which one do you prefer?

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Gerrit-MessageType: comment
Gerrit-Change-Id: I6e1196a2fa47e5954c4a190aa326c135d039a77f
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <>
Gerrit-Reviewer: Lars Volker <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-HasComments: No

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