// SERVER-2810 - similar to explain1 test, but with a scan and order find

t = db.jstests_slowNightly_explain3;
t.drop();

// Periodically drops the collection, invalidating client cursors for s2's operations.
s1 = startParallelShell(
    "t = db.jstests_slowNightly_explain1; for( var i = 0; i < 80; ++i ) { t.drop(); t.ensureIndex({x:1}); for( var j = 0; j < 1000; ++j ) { t.save( {x:j,y:1} ) }; sleep( 100 ); }");

// Query repeatedly.
s2 = startParallelShell(
    "t = db.jstests_slowNightly_explain1; for( var i = 0; i < 500; ++i ) { try { z = t.find( {x:{$gt:0},y:1} ).sort({x:1}).explain(); } catch( e ) {} }");

// Put pressure on s2 to yield more often.
s3 = startParallelShell(
    "t = db.jstests_slowNightly_explain1; for( var i = 0; i < 200; ++i ) { t.validate({scandata:true}); }");

s1();
s2();
s3();
