Package io.debezium.connector.mysql
Class MySqlHistoryRecordComparator
java.lang.Object
io.debezium.relational.history.HistoryRecordComparator
io.debezium.connector.mysql.MySqlHistoryRecordComparator
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Nested Class Summary
Modifier and TypeClassDescriptionprivate static class
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Field Summary
Fields inherited from class io.debezium.relational.history.HistoryRecordComparator
INSTANCE
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionprotected boolean
isPositionAtOrBefore
(Document recorded, Document desired) Determine whether the first offset is at or before the point in time of the second offset, where the offsets are given in JSON representation of the maps returned byMySqlOffsetContext.getOffset()
.Methods inherited from class io.debezium.relational.history.HistoryRecordComparator
isAtOrBefore, isSameSource
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Field Details
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gtidSourceFilter
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Constructor Details
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MySqlHistoryRecordComparator
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Method Details
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isPositionAtOrBefore
Determine whether the first offset is at or before the point in time of the second offset, where the offsets are given in JSON representation of the maps returned byMySqlOffsetContext.getOffset()
.This logic makes a significant assumption: once a MySQL server/cluster has GTIDs enabled, they will never be disabled. This is the only way to compare a position with a GTID to a position without a GTID, and we conclude that any position with a GTID is *after* the position without.
When both positions have GTIDs, then we compare the positions by using only the GTIDs. Of course, if the GTIDs are the same, then we also look at whether they have snapshots enabled.
- Overrides:
isPositionAtOrBefore
in classHistoryRecordComparator
- Parameters:
recorded
- the position obtained from recorded history; never nulldesired
- the desired position that we want to obtain, which should be after some recorded positions, at some recorded positions, and before other recorded positions; never null- Returns:
true
if the recorded position is at or before the desired position; orfalse
otherwise
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