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Docs 782 writebacksqueued #428

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Nov 27, 2012
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Docs 782 writebacksqueued #428

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ee7452a
DOCS-782 update writeBacksQueued to reflect change from Boolean result
Nov 21, 2012
ea21b18
checkpoint commit
Nov 26, 2012
d67adbd
Added example output
Nov 26, 2012
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58 changes: 53 additions & 5 deletions source/reference/command/writeBacksQueued.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,59 @@ writeBacksQueued (internal)
===========================

.. default-domain:: mongodb

.. dbcommand:: writeBacksQueued

:dbcommand:`writeBacksQueued` is an internal command that returns true if
there are operations in the write back queue for the given :program:`mongos`.
This command applies to :term:`sharded clusters <sharded cluster>` only.
:dbcommand:`writeBacksQueued` is an internal command that returns
a document reporting there are operations in the write back queue
for the given :program:`mongos` and information about the queues.

:field Boolean hasOpsQueued:

True if there are writeBack operations queued.

:field integer totalOpsQueued:

The number of operations queued.

:field document queues:

A document listing the queues, with fields detailing the size of
each queue and the time since the last call.

:field document queues.n:

The size of the queue.

:field document queues.minutesSinceLastCall:

The minutes since the last call.

Examples
--------
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putting headings on this page will break the pages with all of the includes. because it'll include the whole file and randomly have an "examples" heading in the output.


.. code-block:: javascript

> db.runCommand({writeBacksQueued: 1})
{
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whitespace is weird: tabs rather than three spaces?

I also prefer to avoid shell session copypasta. Report the output and the commands separately, rather than force people to parse shell scroll back.

"hasOpsQueued" : true,
"totalOpsQueued" : 7,
"queues" : {
"50a514204a0f431ff1944089" : { "n" : 0, "minutesSinceLastCall" : 1 },
"50a854a2c302ba1c5aeaaf59" : { "n" : 0, "minutesSinceLastCall" : 0 },
"50a854b65bbdacd51df98cb6" : { "n" : 0, "minutesSinceLastCall" : 0 },
"50a854c6ff03535c6effb72e" : { "n" : 0, "minutesSinceLastCall" : 0 },
"50a8553566232f70121071b3" : { "n" : 0, "minutesSinceLastCall" : 4 },
"50aa4711bd3c78d62453017e" : { "n" : 0, "minutesSinceLastCall" : 0 },
"50ac0df0293da708be675123" : { "n" : 0, "minutesSinceLastCall" : 1 }
},
"ok" : 1
}


.. slave-ok, admin-only

.. slave-ok, admin-only
.. The queue ids are BSON objectids, they correspond to the
mongos that has talked to this shard. This is derived from the
"serverID" field of the setShardVersion command the mongos
sends to the shard