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©2018 Wantedly, Inc.
Dgraph - A high performance
graph database written in pure Go
Go Conference 2018 Spring - @munisystem
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©2018 Wantedly, Inc.
Yuichi Saito
@munisystem
• Wantedly, Inc.
• Infrastructure Engineer
• Microservices
• Productivity
• My Favorite Golang Products
• Istio / Istio
• wercker / stern
• ory / dockertest
ࣗݾհ
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w ͱจཤྺ
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ਓਓɺਓͳͲͦΕͧΕʹରͯ͠ϦϨʔγϣϯΛఆٛ
ϙϦϞʔϑΟοΫͳϦϨʔγϣϯΛఆٛ
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άϥϑσʔλϕʔεݸʑͷͭͳ͕ΓϑΥʔΧεͨ͠σʔλετΞ
w શͯͷσʔλ/PEFͱ&EHFͰදݱ͞ΕΔ
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C
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©2018 Wantedly, Inc.
Index Free Adjacency
w /PEF࣍ͷ/PEFΞΫηε͢ΔͨΊͷΞυϨεΛ࣋ͭ
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©2018 Wantedly, Inc.
Index Free Adjacency
w /PEF࣍ͷ/PEFΞΫηε͢ΔͨΊͷΞυϨεΛ࣋ͭ
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A
B
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©2018 Wantedly, Inc.
Index Free Adjacency
w /PEF࣍ͷ/PEFΞΫηε͢ΔͨΊͷΞυϨεΛ࣋ͭ
w ୳ࡧࣗͷ࣋ͭ&EHFͷ͚ͩͰΑ͍
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A
B
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©2018 Wantedly, Inc.
8BOUFEMZ1FPQMF͕Ϣʔβʹఏڙ͍ͯ͠ΔՁ
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طଘͷάϥϑσʔλϕʔεͷ
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©2018 Wantedly, Inc.
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εέʔϧ͠ͳ͍ߏ
• αʔϏεͷʹεέʔϧͰԠ͡ΒΕΔඞཁ͕͋Δ
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طଘͷάϥϑσʔλϕʔεͷ
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©2018 Wantedly, Inc.
%HSBQIͷհ
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©2018 Wantedly, Inc.
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https://blog.dgraph.io/post/benchmark-
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©2018 Wantedly, Inc.
%HSBQIͷσʔλϞσϧ
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©2018 Wantedly, Inc.
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Dgraphͱ
C
Bob b
a Alice
friend named
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©2018 Wantedly, Inc.
%HSBQIͷσʔλߏ
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1PTUJOH
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message Posting {
fixed64 uid = 1;
bytes value = 2;
enum ValType {
DEFAULT = 0;
BINARY = 1;
INT = 2;
FLOAT = 3;
BOOL = 4;
DATETIME = 5;
GEO = 6;
UID = 7;
PASSWORD = 8;
STRING = 9;
}
ValType val_type = 3;
...
...
enum PostingType {
REF=0;
VALUE=1;
VALUE_LANG=2;
}
PostingType posting_type = 4;
bytes lang_tag = 5;
string label = 6;
repeated api.Facet facets = 9;
uint32 op = 12;
uint64 start_ts = 13;
uint64 commit_ts = 14;
}
Protobuf ʹΑΔ Posting ͷఆٛ
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1PTUJOH-JTU
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message PostingList {
repeated Posting postings = 1;
bytes checksum = 2;
uint64 commit = 3;
bytes uids = 4;
}
Protobuf ʹΑΔ Posting ͷఆٛ
(Predicate,Subject) -> PostingList
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#BEHFS
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©2018 Wantedly, Inc.
#BEHFSͷΈ
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©2018 Wantedly, Inc.
-PH4USVDUVSFE.FSHF5SFF
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Storage architecture of Badger
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-PH4USVDUVSFE.FSHF5SFF
Add: (muni, 30)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Carol 30
Level 0 (Mem Table)
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-PH4USVDUVSFE.FSHF5SFF
Add: (muni, 30)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Carol 30
muni 30
Level 0 (Mem Table)
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-PH4USVDUVSFE.FSHF5SFF
Add: (muni, 30)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Level 0 (Mem Table)
L W
Carol 10
muni 20
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-PH4USVDUVSFE.FSHF5SFF
Set: (Alice, 20)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Level 0 (Mem Table)
L W
Carol 10
muni 20
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-PH4USVDUVSFE.FSHF5SFF
Set: (Alice, 20) ... will remove (Alice, 10) when merge
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Alice 20
Level 0 (Mem Table)
L W
Carol 10
muni 20
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-PH4USVDUVSFE.FSHF5SFF
Add: (mike, 50)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Alice 20
Level 0 (Mem Table)
L W
Carol 10
muni 20
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-PH4USVDUVSFE.FSHF5SFF
Add: (mike, 50)
Storage architecture of Badger
L W
Alice 10
Bob 20
Level 1
L W
Alice 20
mike 50
Level 0 (Mem Table)
L W
Carol 10
muni 20
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-PH4USVDUVSFE.FSHF5SFF
Add: (mike, 50)
Storage architecture of Badger
L W
Alice 20
mike 50
Level 1
L W
Level 0 (Mem Table)
L W
Carol 10
muni 20
Bob 20
Level 2
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-PH4USVDUVSFE.FSHF5SFF
w Կ͕خ͍͠ʁ
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w ϑΝΠϧͷ͚ͩγʔΫ͢ΕΑ͍
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Storage architecture of Badger
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"$*%5SBOTBDUJPO
w ࣮.VMUJ7FSTJPO$PODVSSFODZ$POUSPM
w 3FBEͨ͠ͱ͖ɺߦʹUJNFTUBNQΛ༩͢Δ
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ACID Transaction of Badger
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©2018 Wantedly, Inc.
%HSBQIͷεέʔϦϯά
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©2018 Wantedly, Inc.
%HSBQIΛߏ͢Δίϯϙʔωϯτ
w [FSP
w Ϋϥελͷཧϊʔυ
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(SPVQ
w Ҏ্ͷTFSWFSʹΑͬͯߏ͞ΕΔ
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w ͭͳ͕ΓΛอଘ͢ΔσʔλετΞͱͯ͠
άϥϑσʔλϕʔεΛ࠾༻
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