data losing #5240
Description
What version of Dgraph are you using?
v1.2.2
Have you tried reproducing the issue with the latest release?
No
What is the hardware spec (RAM, OS)?
ubuntu 18.04 - CPU 4Core - 8GB Ram
Dgraph configurations
they registered as service in /etc/systemd/system/dg0.service and ...
for example
[Unit]
Description=my main dgraph zero server
After=network.target
StartLimitBurst=5
StartLimitIntervalSec=10
[Service]
Type=simple
Restart=always
RestartSec=1
User=root
ExecStart=/usr/local/bin/dgraph zero --config /db/z0/config.json
[Install]
WantedBy=multi-user.target
1 Zero [
{
"my": "localhost:5080",
"replicas": 3,
"wal": "/db/z0/zw"
}
]
3 Alphas [
{
"my": "localhost:7080",
"zero": "localhost:5080",
"lru_mb": 2048,
"postings": "/db/a0/p",
"wal": "/db/a0/w"
},{
"my": "localhost:7079",
"zero": "localhost:5080",
"lru_mb": 2048,
"postings": "/db/a1/p",
"wal": "/db/a1/w",
"port_offset": -1
},{
"my": "localhost:7078",
"zero": "localhost:5080",
"lru_mb": 2048,
"postings": "/db/a2/p",
"wal": "/db/a2/w",
"port_offset": -2
}
]
Expected behaviour and actual result.
current Dgraph index 0x16993f
I have a really edgy and complicated data including 2000 exams and ~50000 Questions and 200000 choices. each node has a ~owner . in other word there is a person who owned all those nodes.
there are some other things he owed too.
i've got nothing when runing:
{
data(func:uid(UserUid)) {
owner @filter(type(Exam)) {
uid
name
}
}
}
bot i have this one
{
data(func:uid(UserUid)) {
owner @filter(uid(ExamUid)) {
uid
name
}
}
}
and this one
{
data(func:type(Exam)) @filter(uid(ExamUid)) {
uid
}
}
It happened to me twice and i restore from backup each time.
i zipped the p&w and also export the database after crashing and zipped it to and here they are
the exported data is not complete. i mean don't contain the whole data. so i couldn't restore it.
export.zip
w.1.zip
the p.1.zip
Main Questions
fixing data is not important . the most important thing is that what should i do to prevent this happen again?
can Simultaneous requests cause this?