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/**
* Tests that a migration will continuously retry sync source selection when there are no available
* donor hosts. Also checks that a donor host is considered an uneligible sync source when it has a
* majority OpTime earlier than the recipient's stored 'startApplyingDonorOpTime'.
*
* Tests that if a donor host becomes available, the recipient will successfully choose it as a
* sync source and resume the migration.
*
* @tags: [requires_majority_read_concern, requires_fcv_49, incompatible_with_windows_tls,
* incompatible_with_eft, incompatible_with_macos, requires_persistence]
*/
(function() {
"use strict";
load("jstests/replsets/libs/tenant_migration_recipient_sync_source.js");
// After this setUp() call, we should have a migration with 'secondary' read preference. The
// recipient should be continuously retrying sync source selection, unable to choose
// 'delayedSecondary' because it is too stale and 'donorSecondary' because it is down.
const {
tenantMigrationTest,
migrationOpts,
donorSecondary,
delayedSecondary,
hangAfterCreatingConnections
} = setUpMigrationSyncSourceTest();
if (!tenantMigrationTest) {
// Feature flag was not enabled.
return;
}
const donorRst = tenantMigrationTest.getDonorRst();
jsTestLog("Restarting 'donorSecondary'");
donorRst.start(donorSecondary, null /* options */, true /* restart */);
// The recipient should eventually be able to connect to the donor secondary, after the node reaches
// 'secondary' state.
hangAfterCreatingConnections.wait();
const recipientPrimary = tenantMigrationTest.getRecipientPrimary();
const res = recipientPrimary.adminCommand({currentOp: true, desc: "tenant recipient migration"});
const currOp = res.inprog[0];
// 'donorSecondary' should always be the chosen sync source, since read preference is 'secondary'
// and 'delayedSecondary' cannot be chosen because it is too stale.
assert.eq(donorSecondary.host,
currOp.donorSyncSource,
`the recipient should only be able to choose 'donorSecondary' as sync source`);
hangAfterCreatingConnections.off();
restartServerReplication(delayedSecondary);
assert.commandWorked(tenantMigrationTest.waitForMigrationToComplete(migrationOpts));
assert.commandWorked(tenantMigrationTest.forgetMigration(migrationOpts.migrationIdString));
donorRst.stopSet();
tenantMigrationTest.stop();
})();
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