Enis Soztutar created HBASE-14070:
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Summary: Hybrid Logical Clocks for HBase
Key: HBASE-14070
URL: https://issues.apache.org/jira/browse/HBASE-14070
Project: HBase
Issue Type: New Feature
Reporter: Enis Soztutar
Assignee: Enis Soztutar
HBase and Phoenix uses systems physical clock (PT) to give timestamps to events
(read and writes). This works mostly when the system clock is strictly
monotonically increasing and there is no cross-dependency between servers
clocks. However we know that leap seconds, general clock skew and clock drift
are in fact real.
This jira proposes using Hybrid Logical Clocks (HLC) as an implementation of
hybrid physical clock + a logical clock. HLC is best of both worlds where it
keeps causality relationship similar to logical clocks, but still is compatible
with NTP based physical system clock. HLC can be represented in 64bits.
A design document is attached.
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