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  1. Core Server
  2. SERVER-16713

mapReduce verify() failure with multiple null keys: all.size() == 1

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      var t = db.foo;
t.drop();

t.insert({a: null});
t.insert({b: 1});
t.insert({b: 1}); // doesn't repro without this extra insert

var mapper = function() {
    emit(this.a, 1);
};

var reducer = function(k, v) {
    return Array.sum(v);
};

t.mapReduce(mapper, reducer, {out: {inline: true}});
      Show
      var t = db.foo; t.drop(); t.insert({a: null}); t.insert({b: 1}); t.insert({b: 1}); // doesn't repro without this extra insert var mapper = function() { emit(this.a, 1); }; var reducer = function(k, v) { return Array.sum(v); }; t.mapReduce(mapper, reducer, {out: {inline: true}});

      I was able to reproduce this bug with master and 2.2.7 (but didn't test further back than that).

      Assertion failure all.size() == 1 src/mongo/db/commands/mr.cpp 512

#0  0x00007ffff7bcc20b in raise (sig=5) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
#1  0x00000000018a6003 in mongo::mongo_breakpoint () at src/mongo/util/debug_util.cpp:58
#2  0x000000000189c7f8 in mongo::breakpoint () at src/mongo/util/debug_util.h:73
#3  0x000000000189b454 in mongo::verifyFailed (expr=0x1f69337 "all.size() == 1", file=0x1f68f8a "src/mongo/db/commands/mr.cpp", line=512) at src/mongo/util/assert_util.cpp:134
#4  0x00000000012bcf83 in mongo::mr::State::appendResults (this=0x7ffff7fca1c0, final=...) at src/mongo/db/commands/mr.cpp:512
#5  0x00000000012c3910 in mongo::mr::MapReduceCommand::run (this=0x28396c0 <mongo::mr::mapReduceCommand>, txn=0x7ffff7fcb7b0, dbname=..., cmd=..., errmsg=..., result=..., fromRepl=false)
    at src/mongo/db/commands/mr.cpp:1465
#6  0x0000000001323415 in mongo::_execCommand (txn=0x7ffff7fcb7b0, c=0x28396c0 <mongo::mr::mapReduceCommand>, dbname=..., cmdObj=..., queryOptions=0, errmsg=..., result=..., fromRepl=false)
    at src/mongo/db/dbcommands.cpp:1256
#7  0x0000000001324392 in mongo::Command::execCommand (txn=0x7ffff7fcb7b0, c=0x28396c0 <mongo::mr::mapReduceCommand>, queryOptions=0, cmdns=0x33b6414 "test.$cmd", cmdObj=..., result=..., fromRepl=false)
    at src/mongo/db/dbcommands.cpp:1472
#8  0x0000000001324c74 in mongo::_runCommands (txn=0x7ffff7fcb7b0, ns=0x33b6414 "test.$cmd", _cmdobj=..., b=..., anObjBuilder=..., fromRepl=false, queryOptions=0) at src/mongo/db/dbcommands.cpp:1547
#9  0x00000000015272b4 in mongo::runCommands (txn=0x7ffff7fcb7b0, ns=0x33b6414 "test.$cmd", jsobj=..., curop=..., b=..., anObjBuilder=..., fromRepl=false, queryOptions=0) at src/mongo/db/query/find.cpp:131
#10 0x0000000001529040 in mongo::runQuery (txn=0x7ffff7fcb7b0, m=..., q=..., curop=..., result=..., fromDBDirectClient=false) at src/mongo/db/query/find.cpp:565
#11 0x000000000142f0ed in mongo::receivedQuery (txn=0x7ffff7fcb7b0, c=..., dbresponse=..., m=..., fromDBDirectClient=false) at src/mongo/db/instance.cpp:224
#12 0x00000000014301ff in mongo::assembleResponse (txn=0x7ffff7fcb7b0, m=..., dbresponse=..., remote=..., fromDBDirectClient=false) at src/mongo/db/instance.cpp:394
#13 0x000000000113310a in mongo::MyMessageHandler::process (this=0x307c1e8, m=..., port=0x30ab5c0, le=0x33c01e0) at src/mongo/db/db.cpp:195
#14 0x00000000018c3949 in mongo::PortMessageServer::handleIncomingMsg (arg=0x30942b0) at src/mongo/util/net/message_server_port.cpp:234
#15 0x00007ffff7bc4182 in start_thread (arg=0x7ffff7fcc700) at pthread_create.c:312
#16 0x00007ffff6cc4efd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

            Assignee:
            backlog-server-query Backlog - Query Team (Inactive)
            Reporter:
            kamran.khan Kamran K.
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            6 Start watching this issue

              Created:
              Updated:
              Resolved: