elek opened a new pull request #2434:
URL: https://github.com/apache/ozone/pull/2434
## What changes were proposed in this pull request?
Freon does have an offline generator test suite to generate quickly local
data (rocksdb + container) for load testing.
But today, the datanode generator doesn't support different replication sets
for the same node. Containers are generated in a way where the replication sets
("pipelines") are always include the same nodes:
In this case, if `node1` is down, only `node2` and `node3` can be used as
the source of the nodes.
With multi-raft option enabled, it's possible to have a placement were more
than two nodes are used as source.
This patch uses a very simple permutation based approach to have similar
layout but still keep the generation to be predictable.
With the new `--overlap` argument, different containers can have slightly
different replication set / pipelines:
Please replace this section with the link to the Apache JIRA)
## How was this patch tested?
Unit test is added for the new placement calculation.
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