[DOC] Features overview suggests Cinders to increase reliability
Bug #1371360 reported by
Andrew Lazarev
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Sahara |
Fix Released
|
Low
|
Nikita Konovalov |
Bug Description
"Using Cinder volumes increases reliability of data which is important for HDFS service."
This is not true. We strongly not recommend to use any Cinder devices with replication enabled. HDFS makes replication by itself and replication on device level will multiply number of chunks one more time. So, if HDFS has replication factor equal to 3 and Cinder configured to use Swift with replication factor 3, resulting replication factor will be 9. That's why we recommend using Cinder for devices that don't replicate data. This is not something called 'reliability'.
Need to describe this in docs.
Changed in sahara: | |
status: | New → Confirmed |
tags: | added: docs |
Changed in sahara: | |
importance: | Undecided → Medium |
milestone: | none → juno-rc1 |
Changed in sahara: | |
assignee: | nobody → Sharan Kumar (sharan-monikantan) |
Changed in sahara: | |
status: | Confirmed → In Progress |
Changed in sahara: | |
milestone: | juno-rc1 → 2014.2 |
Changed in sahara: | |
milestone: | 2014.2 → juno-rc1 |
Changed in sahara: | |
milestone: | juno-rc1 → kilo-1 |
Changed in sahara: | |
milestone: | kilo-1 → kilo-2 |
Changed in sahara: | |
assignee: | Sharan Kumar (sharan-monikantan) → nobody |
importance: | Medium → Low |
status: | In Progress → Confirmed |
Changed in sahara: | |
milestone: | kilo-2 → kilo-3 |
Changed in sahara: | |
milestone: | kilo-3 → liberty-1 |
Changed in sahara: | |
assignee: | nobody → plieb (jliberma) |
Changed in sahara: | |
milestone: | liberty-1 → liberty-2 |
Changed in sahara: | |
milestone: | liberty-2 → liberty-3 |
Changed in sahara: | |
milestone: | liberty-3 → liberty-rc1 |
Changed in sahara: | |
milestone: | liberty-rc1 → next |
Changed in sahara: | |
status: | Incomplete → Triaged |
assignee: | nobody → Nikita Konovalov (nkonovalov) |
milestone: | none → mitaka-rc1 |
Changed in sahara: | |
milestone: | mitaka-rc1 → newton-1 |
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Cinder does *not* use swift, except for backup.
I'm not sure that this bug makes any sense. The use of replication in cinder is designed for disaster recovery type scenarios, and currently has little effect on per-volume reliability.