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Diffstat (limited to 'src/mongo/db/storage/storage_engine.h')
| -rw-r--r-- | src/mongo/db/storage/storage_engine.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/mongo/db/storage/storage_engine.h b/src/mongo/db/storage/storage_engine.h index 1f97ad2d0d1..6452044ce30 100644 --- a/src/mongo/db/storage/storage_engine.h +++ b/src/mongo/db/storage/storage_engine.h @@ -372,8 +372,18 @@ public: /** * Sets the highest timestamp at which the storage engine is allowed to take a checkpoint. * This timestamp can never decrease, and thus should be a timestamp that can never roll back. + * + * The maximumTruncationTimestamp (and newer) must not be truncated from the oplog in order to + * recover from the `stableTimestamp`. `boost::none` implies there are no additional + * constraints to what may be truncated. + * + * For proper truncation of the oplog, this method requires min(stableTimestamp, + * maximumTruncationTimestamp) to be monotonically increasing (where `min(stableTimestamp, + * boost::none) => stableTimestamp`). Otherwise truncation can race and remove a document + * before a call to this method protects it. */ - virtual void setStableTimestamp(Timestamp timestamp) {} + virtual void setStableTimestamp(Timestamp stableTimestamp, + boost::optional<Timestamp> maximumTruncationTimestamp) {} /** * Tells the storage engine the timestamp of the data at startup. This is necessary because |