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FASTER

access, update, cache
reliable logging and messaging
Apps, Services,
Streaming
Pipelines,
Analytics, …
Devices, Clients,
Dashboards, …
integrated cache
Header | Key | Value


 Streaming state store & cache
persistent queue


-
50
100
150
0 10 20 30 40 50 60
Throughput(Mops/sec)
Number of Threads
FASTER (2cpu)
Intel TBB (2cpu)
Masstree (2cpu)
RocksDB (2cpu)
-
20
40
60
80
100
0 10 20 30 40 50 60
Throughput(Mops/sec)
Number of Threads
FASTER (2cpu)
Intel TBB (2cpu)
Masstree (2cpu)
RocksDB (2cpu)










Hash Bucket
(64-byte cache line)
Array of
𝟐 𝒌
buckets
Record Log
(logical addresses)




Head
Offset
In
Memory
Read-Copy
Update
Stable
LA = 0
Read
Only
LA = ∞
Mutable
Disk
Increasing
Logical
Address
In-Place
Update
ReadOnly
Offset



Head
Offset
In
Memory
Read-Copy
Update
Stable
LA = 0
Read
Only
LA = ∞
Mutable
Disk
Increasing
Logical
Address
In-Place
Update
ReadOnly
Offset
Logical Address Operation
< Head Offset Issue async IO request
< ReadOnly Offset Copy to tail, CAS-update hash index
< Infinity Update in-place
New Record Add to tail, update hash table


1 2 3 4 5
1 2 4 5
1 3 4 5
1 2 3 4 5
Increasing Time →32 4 5
21 3 4
Current Epoch 
Safe Epochs 



Stable
Thread
T1’s View
Read
Only
Mutable
ReadOnly
Offset R1
Record



Stable
Thread
T2’s View
Read
Only
Mutable
ReadOnly
Offset R2
Record
Record



Logical Address Operation
< Head Offset Issue async IO request
< Safe ReadOnly Offset Copy to tail, update hash table
< ReadOnly Offset Go pending
< Infinity Update in-place
New Record Add to tail, update hash table
Stable
Thread
T2’s View
Read
Only
Mutable
Record
Stable
Thread
T1’s View
Read
Only
Mutable
Record
Safe
ReadOnly
Offset
Fuzzy
Region
C P R


 group commit
in-memory incr. checkpointing
 scalable non-blocking


Database
C1
C2
C3
C4
C5
T1T2T3T4
T5T6T7T8
T9T10T11T12
T13T14T15T16
T17T18T19T20
Log Compaction
• Many workloads – just truncate old records from head of log
• Scan X% of log from begin (oldest record) onwards
• Build temp table (in-mem hash) of key-values
• Scan rest of log, eliminate unneeded keys from temp table
• Re-insert live “cold” keys to tail of log, truncate first X% of log
BEGIN TAIL
larger-than-memory
temporal locality
“bare metal” throughput
memory is limited
 Recoverable
FASTER Key-Value Store and Log

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Editor's Notes

  1. Epochs incremented by threads when they need to initiate global coordination