HDDS-8222. EndpointBase#getBucket should handle BUCKET_NOT_FOUND

[guohao-rosicky]

What changes were proposed in this pull request?

EndpointBase#getBucket Exception capture content error

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-8222

[adoroszlai]

Thanks @guohao-rosicky for spotting the bug. Please add an assertion in existing test to verify result code:

ozone/hadoop-ozone/s3gateway/src/test/java/org/apache/hadoop/ozone/s3/metrics/TestS3GatewayMetrics.java

Lines 149 to 165 in b570ca7

	@Test
	public void testGetBucketFailure() throws Exception {
	long oriMetric = metrics.getGetBucketFailure();
	try {
	// Searching for a bucket that does not exist
	bucketEndpoint.get("newBucket", null,
	null, null, 1000, null,
	null, "random", null,
	null, null);
	fail();
	} catch (OS3Exception e) {
	}
	long curMetric = metrics.getGetBucketFailure();
	assertEquals(1L, curMetric - oriMetric);
	}

[adoroszlai]

Thanks @guohao-rosicky for adding the test. It turns out that the getBucket(OzoneVolume, String) method being fixed is not used by the test, or any other code for that matter. All callers use the other one, getBucket(String).

Anyway, the fix is fine and the test addition is welcome.