snvijaya commented on a change in pull request #1923:
URL: https://github.com/apache/hadoop/pull/1923#discussion_r412520627
##########
File path:
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/oauth2/CustomTokenProviderAdapter.java
##########
@@ -46,16 +48,53 @@
*
* @param adaptee the custom token provider
*/
- public CustomTokenProviderAdapter(CustomTokenProviderAdaptee adaptee) {
+ public CustomTokenProviderAdapter(CustomTokenProviderAdaptee adaptee, int
customTokenFetchRetryCount) {
Preconditions.checkNotNull(adaptee, "adaptee");
this.adaptee = adaptee;
+ fetchTokenRetryCount = customTokenFetchRetryCount;
}
protected AzureADToken refreshToken() throws IOException {
LOG.debug("AADToken: refreshing custom based token");
AzureADToken azureADToken = new AzureADToken();
- azureADToken.setAccessToken(adaptee.getAccessToken());
+
+ String accessToken = null;
+
+ Exception ex;
+ boolean succeeded = false;
+ // Custom token providers should have their own retry policies,
+ // Providing a linear retry option for the the retry count
+ // mentioned in config "fs.azure.custom.token.fetch.retry.count"
+ int retryCount = fetchTokenRetryCount;
+ do {
+ ex = null;
+ try {
+ accessToken = adaptee.getAccessToken();
+ LOG.trace("CustomTokenProvider Access token fetch was successful with
retry count {}", retryCount);
+ } catch (Exception e) {
Review comment:
I checked across few articles and recommendation seems to be to not
catch throwable. At this point we need to catch any exception coming from the
CustomTokenProvider.
Pasting couple of links I referenced:
- https://stackify.com/best-practices-exceptions-java/ => scroll to "6.
Don’t Catch Throwable"
-
https://www.baeldung.com/java-catch-throwable-bad-practice#catching-throwable
Please let me know if you still think this needs to be changed.
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