Tests fail with "leadership transfer failed"

[gibmat]

Recently, two tests have begun failing when building this library on a Debian unstable system. What's puzzling is that the version of this library hasn't changed (1.10.2), which points to a change in one of its dependencies, yet I can't find an obvious culprit.

From my attempts to figure out why the tests are failing, it seems to be related to the version of the raft library (v0.9.25 works fine, with errors appearing when using v0.11.2) --but-- the tests had previously passed when the raft version in unstable was 0.11.2+git211119. I thought it might be related to newer versions of dqlite (hasn't changed in Debian unstable since mid-November) or sqlite3 (v3.37 was just recently uploaded, but tests fail with v3.36 as well).

I'm hoping someone else may have some idea about what's changed that is now causing the tests to fail.

Versions:

• Debian unstable
• golang v1.17.6
• go-dqlite v1.10.2
• dqlite v1.9.0+git211116
• raft v0.11.2+git211214
• sqlite3 v3.37.2

=== RUN   TestHandover_TwoNodes
    app_test.go:958: 22:17:01.858 - 36: DEBUG: new connection from 127.0.0.1:39042
    app_test.go:958: 22:17:01.885 - 36: DEBUG: attempt 0: server 127.0.0.1:9001: connected
    app_test.go:958: 22:17:01.888 - 36: DEBUG: new connection from 127.0.0.1:39044
    app_test.go:958: 22:17:01.024 - 36: DEBUG: new connection from 127.0.0.1:39046
    app_test.go:958: 22:17:01.041 - 37: DEBUG: attempt 0: server 127.0.0.1:9001: connected
    app_test.go:958: 22:17:01.053 - 36: DEBUG: new connection from 127.0.0.1:39050
    app_test.go:958: 22:17:01.053 - 37: DEBUG: new connection from 127.0.0.1:46340
    app_test.go:958: 22:17:01.077 - 36: DEBUG: new connection from 127.0.0.1:39052
    app_test.go:958: 22:17:01.102 - 36: DEBUG: attempt 0: server 127.0.0.1:9001: connected
    app_test.go:958: 22:17:01.102 - 37: DEBUG: new connection from 127.0.0.1:46346
    app_test.go:958: 22:17:01.102 - 36: DEBUG: new connection from 127.0.0.1:39056
    app_test.go:958: 22:17:01.128 - 37: DEBUG: new connection from 127.0.0.1:46350
    app_test.go:958: 22:17:01.153 - 36: DEBUG: new connection from 127.0.0.1:39060
    app_test.go:958: 22:17:01.783 - 36: DEBUG: promoted 127.0.0.1:9002 from spare to voter
    app_test.go:958: 22:17:01.783 - 37: DEBUG: new connection from 127.0.0.1:46354
    app_test.go:958: 22:17:01.783 - 36: DEBUG: new connection from 127.0.0.1:39064
    app_test.go:958: 22:17:01.822 - 36: WARN: transfer leadership to 127.0.0.1:9002: leadership transfer failed (1)
    app_test.go:318: 
        	Error Trace:	app_test.go:318
        	Error:      	Received unexpected error:
        	            	transfer leadership: leadership transfer failed (1)
        	Test:       	TestHandover_TwoNodes
--- FAIL: TestHandover_TwoNodes (1.16s)

=== RUN   TestClient_Transfer
    client_test.go:117: 
        	Error Trace:	client_test.go:117
        	Error:      	Received unexpected error:
        	            	leadership transfer failed (1)
        	Test:       	TestClient_Transfer
--- FAIL: TestClient_Transfer (1.16s)

[MathieuBordere]

raft 0.11.2 and dqlite 1.9.0 are slightly old, can you try with the new raft 0.11.3 and dqlite 1.9.1?

[gibmat]

Sorry for the delay in replying -- today I did try building with the current versions of raft and dqlite, and now tests are passing again. I don't know exactly what the issue was, but since things are working again I'll close this issue. Sorry about the noise!