Marton Elek created HDDS-2413:
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Summary: Set configuration variables from annotated java objects
Key: HDDS-2413
URL: https://issues.apache.org/jira/browse/HDDS-2413
Project: Hadoop Distributed Data Store
Issue Type: Task
Reporter: Marton Elek
Assignee: Marton Elek
HDDS-1469 introduced a new method to handle configuration. Configuration can be
injected directly to java objects which makes all the java constants
unnecessary.
Almost.
To read the configuration it's enough to have an annotated java object. For
example:
{code:java}
@ConfigGroup(prefix = "hdds.scm")
public class ScmConfig {
private String principal;
private String keytab; @Config(key = "kerberos.principal",
type = ConfigType.STRING,
defaultValue = "",
tags = { ConfigTag.SECURITY, ConfigTag.OZONE },
description = "This Kerberos principal is used by the SCM service."
)
public void setKerberosPrincipal(String kerberosPrincipal) {
this.principal = kerberosPrincipal; {code}
And the configuration can be set in ozone-site.xml
Unfortunately during the unit testing we need to inject the configuration
variables programmatically which requires a String constant:
{code:java}
configuration.set(ScmConfig.ConfigStrings.HDDS_SCM_KERBEROS_PRINCIPAL_KEY,
"scm/" + host + "@" + realm); {code}
I propose to implement a simple setter in the OzoneConfiguration which may help
to set configuration based on an annotated configuration object instance:
{code:java}
OzoneConfiguration conf = new OzoneConfiguration();
SCMHTTPServerConfig httpConfig = SCMHTTPServerConfig(principal1,...);
conf.setFromObject(httpConfig){code}
This is the opposite direction of the existing OzoneConfiguration.getObject()
and can be implemented with a similar approach.
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