sodonnel opened a new pull request #1148:
URL: https://github.com/apache/hadoop-ozone/pull/1148
## What changes were proposed in this pull request?
This change provides two new endpoints on the Recon "containers" endpoint:
/containers/unhealthy
/containers/unhealthy/{state}
The intention is for these endpoints to replace /containers/missing, but
that end point is still in place as we need to change the front end of recon to
use this new endpoint first.
Calling either of the above new endpoints will return a summary of all
unhealthy containers in the response, eg:
```
@JsonProperty("missingCount")
private long missingCount = 0;
@JsonProperty("underReplicatedCount")
private long underReplicatedCount = 0;
@JsonProperty("overReplicatedCount")
private long overReplicatedCount = 0;
@JsonProperty("misReplicatedCount")
private long misReplicatedCount = 0;
```
Followed by either:
* A list of all unhealthy containers, sorted by `container_id asc , state
asc` for the /containers/unhealthy endpoint
* A list of unhealthy containers in the passed state, sorted by
`container_id asc , state asc` for the /containers/unhealthy/{state} endpoint
Note that even when /containers/unhealthy/{state} is passed, the full
summary of all containers is returned - it would be possible to only give a
summary of the passed state, but I think it makes sense to give the full
summary on all calls and just filter the list based on the passed parameter.
For both endpoints, there is a parameter "limit" to control how many
containers to return (default 1000) and "batchNum" starting a 1 to get each
batch / page of results.
The reason it does not use the previous container_id to start the next
batch, is because there may be more than 1 database entry per container, and
therefore we would need to pass preContainerId and preState. However it would
be possible to change to use this if it is desired.
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-3831
## How was this patch tested?
New unit tests
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