Janus Chow created HDDS-5243:
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Summary: Return latest version of key location for client
Key: HDDS-5243
URL: https://issues.apache.org/jira/browse/HDDS-5243
Project: Apache Ozone
Issue Type: Improvement
Reporter: Janus Chow
Assignee: Janus Chow
Currently, OmKeyInfo uses a `keyLocationVersions: List<OmKeyLocationInfoGroup>`
to store all versions of KeyLocation information. If a key has lots of
versions, OM needs to reply all the content of `keyLocationVersions` to the
client, which may cause the following IPC warning, when the size exceeds the
client IPC response size limit becomes an error.
{code:java}
2021-05-18 23:10:07,246 [IPC Server handler 97 on default port 9862] WARN
org.apache.hadoop.ipc.Server: Large response size 20541123 for call Call#3
Retry#0 org.apache.hadoop.ozone.om.protocol.OzoneManagerProtocol.submitRequest
from 10.130.20.239:46306
{code}
This ticket is to add an config for client to only query the latest content in
`keyLocationVersions`, which can reduce the IPC response size and improve OM's
performance by excluding lots of unnecessary work with old key locations.
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