clientv3: fix race on watch initial revision #6587
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The initial revision was being updated in the substream goroutine defer; this was racing with the resume path fetching the initial revision when the substream closes during resume. Instead, update the initial revision whenever the substream processes a new watch response. Since the substream cannot receive a watch response while it is resuming, the write to the initial revision is ordered to always happen after the resume read. Fixes etcd-io#6586
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lgtm |
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The initial revision was being updated in the substream goroutine defer;
this was racing with the resume path fetching the initial revision when
the substream closes during resume. Instead, update the initial revision
whenever the substream processes a new watch response. Since the substream
cannot receive a watch response while it is resuming, the write to the
initial revision is ordered to always happen after the resume read.
Fixes #6586