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// Cannot implicitly shard accessed collections because the "command" field in the currentOp()
// output is reported as {"mapreduce.shardedfinish": { mapreduce: "jstests_mr_killop", ... }, ... }
// when the "finalize" option to the "mapReduce" command is used on a sharded collection.
// @tags: [assumes_unsharded_collection, does_not_support_stepdowns]
// Test killop applied to m/r operations and child ops of m/r operations.
t = db.jstests_mr_killop;
t.drop();
t2 = db.jstests_mr_killop_out;
t2.drop();
db.adminCommand({"configureFailPoint": 'mr_killop_test_fp', "mode": 'alwaysOn'});
function debug(x) {
// printjson( x );
}
/** @return op code for map reduce op created by spawned shell, or that op's child */
function op(childLoop) {
p = db.currentOp().inprog;
debug(p);
let isMapReduce = function(op) {
if (!op.command) {
return false;
}
let cmdBody = op.command;
if (cmdBody.$truncated) {
let stringifiedCmd = cmdBody.$truncated;
print('str: ' + tojson(stringifiedCmd));
return stringifiedCmd.search('mapreduce') >= 0 &&
stringifiedCmd.search('jstests_mr_killop') >= 0;
}
return cmdBody.mapreduce && cmdBody.mapreduce == "jstests_mr_killop";
};
for (var i in p) {
var o = p[i];
// Identify a map/reduce or where distinct operation by its collection, whether or not
// it is currently active.
if (childLoop) {
if ((o.active || o.waitingForLock) && o.command && o.command.query &&
o.command.query.$where && o.command.distinct == "jstests_mr_killop") {
return o.opid;
}
} else {
if ((o.active || o.waitingForLock) && isMapReduce(o)) {
return o.opid;
}
}
}
return -1;
}
/**
* Run one map reduce with the specified parameters in a parallel shell, kill the
* map reduce op or its child op with killOp, and wait for the map reduce op to
* terminate.
* @param childLoop - if true, a distinct $where op is killed rather than the map reduce op.
* This is necessay for a child distinct $where of a map reduce op because child
* ops currently mask parent ops in currentOp.
*/
function testOne(map, reduce, finalize, scope, childLoop, wait) {
debug("testOne - map = " + tojson(map) + "; reduce = " + tojson(reduce) + "; finalize = " +
tojson(finalize) + "; scope = " + tojson(scope) + "; childLoop = " + childLoop +
"; wait = " + wait);
t.drop();
t2.drop();
// Ensure we have 2 documents for the reduce to run
t.save({a: 1});
t.save({a: 1});
spec = {mapreduce: "jstests_mr_killop", out: "jstests_mr_killop_out", map: map, reduce: reduce};
if (finalize) {
spec["finalize"] = finalize;
}
if (scope) {
spec["scope"] = scope;
}
// Windows shell strips all double quotes from command line, so use
// single quotes.
stringifiedSpec = tojson(spec).toString().replace(/\n/g, ' ').replace(/\"/g, "\'");
// The assert below won't be caught by this test script, but it will cause error messages
// to be printed.
var awaitShell =
startParallelShell("assert.commandWorked( db.runCommand( " + stringifiedSpec + " ) );");
if (wait) {
sleep(2000);
}
o = null;
assert.soon(function() {
o = op(childLoop);
return o != -1;
});
res = db.killOp(o);
debug("did kill : " + tojson(res));
// When the map reduce op is killed, the spawned shell will exit
var exitCode = awaitShell({checkExitSuccess: false});
assert.neq(0,
exitCode,
"expected shell to exit abnormally due to map-reduce execution being terminated");
debug("parallel shell completed");
assert.eq(-1, op(childLoop));
}
/** Test using wait and non wait modes */
function test(map, reduce, finalize, scope, childLoop) {
debug(" Non wait mode");
testOne(map, reduce, finalize, scope, childLoop, false);
debug(" Wait mode");
testOne(map, reduce, finalize, scope, childLoop, true);
}
/** Test looping in map and reduce functions */
function runMRTests(loop, childLoop) {
debug(" Running MR test - loop map function. no scope ");
test(loop, // map
function(k, v) {
return v[0];
}, // reduce
null, // finalize
null, // scope
childLoop);
debug(" Running MR test - loop reduce function ");
test(
function() {
emit(this.a, 1);
}, // map
loop, // reduce
null, // finalize
null, // scope
childLoop);
debug(" Running finalization test - loop map function. with scope ");
test(
function() {
loop();
}, // map
function(k, v) {
return v[0];
}, // reduce
null, // finalize
{loop: loop}, // scope
childLoop);
}
/** Test looping in finalize function */
function runFinalizeTests(loop, childLoop) {
debug(" Running finalization test - no scope ");
test(
function() {
emit(this.a, 1);
}, // map
function(k, v) {
return v[0];
}, // reduce
loop, // finalize
null, // scope
childLoop);
debug(" Running finalization test - with scope ");
test(
function() {
emit(this.a, 1);
}, // map
function(k, v) {
return v[0];
}, // reduce
function(a, b) {
loop();
}, // finalize
{loop: loop}, // scope
childLoop);
}
// Run inside server. No access to debug().
var loop = function() {
while (1) {
sleep(1000);
}
};
runMRTests(loop, false);
runFinalizeTests(loop, false);
db.adminCommand({"configureFailPoint": 'mr_killop_test_fp', "mode": 'off'});
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