EDIT: Apparently this is a known issue with 1.0.6. Don’t set replicas greater than one!!!
Hi,
I have seemingly a simple setup of Dgraph where I have 3 nodes and zero with the replica factor set to 3. In theory, this just means I have 3 servers with all the same data that should keep each other in sync.
However, I seem to be having an issue with this. Data loads fine from the initial bulk import but when writes have a occurred, it seems to load either old or new data based on which client the code decides to read. I’ve read the NodeJS client code and it seems it is just a Math.random() call to the client so it really just chooses one of the three servers. An example is loading a list of someone’s first degree network, based on which server it hits, would return 3 people or 9 people. It returns 9 people when it hits the server that happened to be written to.
It seems as if the code that is supposed to keep the nodes up-to-date is not working. I had run into this issue before but I had thought it was fixed.
This is my state for the zero:
{
counter: "30587",
groups: {
1: {
members: {
1: {
id: "1",
groupId: 1,
addr: "cluster0-node0:7080",
leader: true,
lastUpdate: "1532445491"
},
2: {
id: "2",
groupId: 1,
addr: "cluster0-node1:7081"
},
3: {
id: "3",
groupId: 1,
addr: "cluster0-node2:7082"
}
},
tablets: {
_group: {
groupId: 1,
predicate: "_group",
space: "113013809"
},
_job: {
groupId: 1,
predicate: "_job",
space: "16565143"
},
_predicate_: {
groupId: 1,
predicate: "_predicate_",
space: "1120645620"
},
_profile: {
groupId: 1,
predicate: "_profile",
space: "202333025"
},
_when: {
groupId: 1,
predicate: "_when",
space: "1000007"
},
applied: {
groupId: 1,
predicate: "applied",
space: "43924"
},
attached: {
groupId: 1,
predicate: "attached",
space: "822111"
},
companyName: {
groupId: 1,
predicate: "companyName",
space: "239475741"
},
contacted: {
groupId: 1,
predicate: "contacted",
space: "18102"
},
email: {
groupId: 1,
predicate: "email",
space: "243858805"
},
favorited: {
groupId: 1,
predicate: "favorited",
space: "20055"
},
group: {
groupId: 1,
predicate: "group",
space: "251350880"
},
hired: {
groupId: 1,
predicate: "hired",
space: "401"
},
id: {
groupId: 1,
predicate: "id",
space: "484887638"
},
knows: {
groupId: 1,
predicate: "knows",
space: "112501873"
},
location: {
groupId: 1,
predicate: "location",
space: "160687969"
},
match: {
groupId: 1,
predicate: "match",
space: "343863263"
},
matchOrder: {
groupId: 1,
predicate: "matchOrder",
space: "310257349"
},
name: {
groupId: 1,
predicate: "name",
space: "277994018"
},
name @en: {
groupId: 1,
predicate: "name@en",
space: "137817195"
},
owner: {
groupId: 1,
predicate: "owner",
space: "834530"
},
potentialEmployers: {
groupId: 1,
predicate: "potentialEmployers",
space: "255510670"
},
prospect: {
groupId: 1,
predicate: "prospect",
space: "241119550"
},
rawLocation: {
groupId: 1,
predicate: "rawLocation",
space: "128348385"
},
recommended: {
groupId: 1,
predicate: "recommended",
space: "78844"
},
seniority: {
groupId: 1,
predicate: "seniority",
space: "232464809"
},
skipped: {
groupId: 1,
predicate: "skipped",
space: "56747"
},
title: {
groupId: 1,
predicate: "title",
space: "276359434"
},
title @en: {
groupId: 1,
predicate: "title@en",
space: "22385293"
},
when: {
groupId: 1,
predicate: "when",
space: "1181826"
}
}
}
},
zeros: {
1: {
id: "1",
addr: "zero:5080",
leader: true
}
},
maxLeaseId: "10260000",
maxTxnTs: "80000",
maxRaftId: "3"
}
