Elek, Marton created HDDS-1258:
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Summary: Fix error propagation for SCM protocol
Key: HDDS-1258
URL: https://issues.apache.org/jira/browse/HDDS-1258
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: Elek, Marton
Assignee: Kitti Nanasi
HDDS-1068 fixed the error propagation between the OM client and OM server.
By default the Server.java transforms all the IOExceptions to one string
(message + stack trace) and this is returned to the client.
But for business exception (eg. volume not found, chill mode is active, etc.)
this is not what we need.
In the OM side we fixed this behaviour. In the ServerSideTranslator classes we
catch (server) the business (OMException) exceptions and serialize them to the
response object.
The exception (and the status code) is stored in message/status field of the
OMResponse (hadoop-ozone/common/src/main/proto/OzoneManagerProtocol.proto)
Here I propose to do the same for the ScmBlockLocationProtocol.proto.
Unfortunately there is no common parent object (like OMRequest) in this
protocol, but we can easily add one as only the Serverside/Clientside
translator should be changed for that.
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