getReplicationInfo command

[majeed said]

Hi,

 when running the command getReplicationInfo command in java (driver 3.2) as the following :

"localDB.runCommand(new Document("getReplicationInfo", Boolean.TRUE));"

getting the error that command is unknown:

com.mongodb.MongoCommandException: Command failed with error 59: 'no such command: getReplicationInfo' on server xxxxxxxxx:27017. The full response is { "ok" : 0.0, "errmsg" : "no such command: getReplicationInfo", "code" : 59, "bad cmd" : { "getReplicationInfo" : true } }

can u please advise how can run the mongo command in java??

Regards,

Majeed

[Ross Lawley]

Hi Majeed,

The reason you are getting an error is because `db.getReplicationInfo()` is not a command.  In fact in its a function in the shell, you can print the function in the shell by removing the parentheses, which gives:

MongoDB Enterprise > db.getReplicationInfo

function () {

    var localdb = this.getSiblingDB("local");

    var result = { };

    var oplog;

    var localCollections = localdb.getCollectionNames();

    if (localCollections.indexOf('oplog.rs') >= 0) {

        oplog = 'oplog.rs';

    }

    else if (localCollections.indexOf('oplog.$main') >= 0) {

        oplog = 'oplog.$main';

    }

    else {

        result.errmsg = "neither master/slave nor replica set replication detected";

        return result;

    }

    var ol = localdb.getCollection(oplog);

    var ol_stats = ol.stats();

    if( ol_stats && ol_stats.maxSize ) {

        result.logSizeMB = ol_stats.maxSize / ( 1024 * 1024 );

    } else {

        result.errmsg  = "Could not get stats for local."+oplog+" collection. " +

            "collstats returned: " + tojson(ol_stats);

        return result;

    }

    result.usedMB = ol_stats.size / ( 1024 * 1024 );

    result.usedMB = Math.ceil( result.usedMB * 100 ) / 100;

    var firstc = ol.find().sort({$natural:1}).limit(1);

    var lastc = ol.find().sort({$natural:-1}).limit(1);

    if( !firstc.hasNext() || !lastc.hasNext() ) {

        result.errmsg = "objects not found in local.oplog.$main -- is this a new and empty db instance?";

        result.oplogMainRowCount = ol.count();

        return result;

    }

    var first = firstc.next();

    var last = lastc.next();

    var tfirst = first.ts;

    var tlast = last.ts;

    if( tfirst && tlast ) {

        tfirst = DB.tsToSeconds( tfirst );

        tlast = DB.tsToSeconds( tlast );

        result.timeDiff = tlast - tfirst;

        result.timeDiffHours = Math.round(result.timeDiff / 36)/100;

        result.tFirst = (new Date(tfirst*1000)).toString();

        result.tLast  = (new Date(tlast*1000)).toString();

        result.now = Date();

    }

    else {

        result.errmsg = "ts element not found in oplog objects";

    }

    return result;

}

So you'd need to replicate the whole function and its logic in the java driver.

Ross

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{ name     : "Ross Lawley",
  title    : "Senior Software Engineer",
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