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https://issues.apache.org/jira/browse/HADOOP-18865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17759580#comment-17759580
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ASF GitHub Bot commented on HADOOP-18865:
-----------------------------------------

anmolanmol1234 commented on code in PR #5987:
URL: https://github.com/apache/hadoop/pull/5987#discussion_r1307404077


##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsClient.java:
##########
@@ -751,6 +752,15 @@ public AbfsRestOperation append(final String path, final 
byte[] buffer,
       }
     }
 
+    // Check if the retry is with "Expect: 100-continue" header being present 
in the previous request.

Review Comment:
   "We are attempting to dynamically update the User-Agent header. The removal 
from the User-Agent would only be necessary if we are retrying the same append 
request that failed due to a user error. Consequently, the retry for the 
identical append request would occur without the 'Expect: 100-continue' header 
enabled." Hence the only way is to remove the string from the header. So even 
if we create a separate method that would have the same functionality. The 
other approach can be to add the string only if expectHeaderIsEnabled but since 
that is for each append request, it would need the userAgent header to be 
updated for each append request making the operation costly.





> ABFS: Adding 100 continue in userAgent String and dynamically removing it if 
> retry is without the header enabled.
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-18865
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18865
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: build
>    Affects Versions: 3.3.6
>            Reporter: Anmol Asrani
>            Assignee: Anmol Asrani
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.3.6
>
>
> Adding 100 continue in userAgent String if enabled in AbfsConfiguration and 
> dynamically removing it if retry is without the header enabled.



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