Fix for transactions not allowed to finish during PlannedReparentShard #8089
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Signed-off-by: Harshit Gangal <harshit@planetscale.com>
…d to serve query Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
deepthi
reviewed
May 10, 2021
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The fix for the old issue is still inplace. This PR removes the additional check done to retrieve queryservice using tablet alias. |
systay
approved these changes
May 11, 2021
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Yes, we need to do both the release after merge and backported. |
systay
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May 11, 2021
Backport of vitessio#8089 This is a combination of 3 commits. * remove precheck of tablet serving and target * remove the additional logic and return error if queryservice not found to serve query * fix test as per new change Signed-off-by: Harshit Gangal <harshit@planetscale.com> Signed-off-by: Andres Taylor <andres@planetscale.com>
systay
pushed a commit
to planetscale/vitess
that referenced
this pull request
May 11, 2021
Backport of vitessio#8089 This is a combination of 3 commits. * remove precheck of tablet serving and target * remove the additional logic and return error if queryservice not found to serve query * fix test as per new change Signed-off-by: Harshit Gangal <harshit@planetscale.com> Signed-off-by: Andres Taylor <andres@planetscale.com>
deepthi
reviewed
May 13, 2021
Comment on lines
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| // ChangeTabletType changes the tablet type. | ||
| func (sbc *SandboxConn) ChangeTabletType(typ topodatapb.TabletType) { | ||
| sbc.tablet.Type = typ | ||
| } | ||
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systay
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Description
In a recent fix, an issue was introduced.
Before sending queries to a tablet, #7879 changed the behaviour to check if the tablet is ready to answer, by checking it's
ServingStatusand that the tablet type hasn't changed.If
PlannedReparentShardis going on, this check should not be done for transactions in flight.The vttablet waits for inflight transactions to get
commit/rollbacki.e. we want queries to existing transaction to be sent down to get the transaction completed, even if the tablet is currently saying it isNotServing.The test that exposed this issue was already in the code base:
go/test/endtoend/tabletgateway/buffer/buffer_test.gobecame flaky after #7879 was merged.So, to fix the issue, the pre-check is removed from Gateway when getting the tablet connection for existing active shard_sessions with vttablet.
This also imply that the reserved connection that used to reset based on this pre-check logic will have to hit the vttablet first and then only will reset the shard session on receiving the expected error making it two round trips.
Related Issue(s)
Bug introduced in #7879
Checklist