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DOCS-297 migrated distributed locking info to manual #296

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Merged
merged 4 commits into from
Oct 9, 2012
Merged

DOCS-297 migrated distributed locking info to manual #296

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b7f024e
DOCS-297 migrated distributed locking info to manual
Oct 9, 2012
06bc160
DOCS-297 minor edit
Oct 9, 2012
f0dc84a
DOCS-297 minor edit
Oct 9, 2012
cc81ef4
DOCS-297 turned info into a note
Oct 9, 2012
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7 changes: 6 additions & 1 deletion source/core/sharding-internals.txt
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Expand Up @@ -348,10 +348,15 @@ The migration process ensures consistency and maximizes availability
of chunks during balancing: when MongoDB begins migrating a chunk, the
database begins copying the data to the new server and tracks incoming
write operations. After migrating chunks, the "from" :program:`mongod`
sends all new writes, to the "receiving" server. Finally,
sends all new writes to the "receiving" server. Finally,
:program:`mongos` updates the chunk record in the :term:`config
database` to reflect the new location of the chunk.

.. note:: Before MongoDB version 2.0, increasing clock skew between
:program:`mongos` instances could lead to failed distributed locks
and potential data loss, particularly if the skew exceeded 5 minutes.
Always run ``ntpd`` to minimize clock skew.

.. _sharding-migration-thresholds:

Migration Thresholds
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