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https://issues.apache.org/jira/browse/HADOOP-18146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17625631#comment-17625631
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ASF GitHub Bot commented on HADOOP-18146:
-----------------------------------------
anmolanmol1234 commented on code in PR #4039:
URL: https://github.com/apache/hadoop/pull/4039#discussion_r1007963664
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/HttpHeaderConfigurations.java:
##########
@@ -60,6 +60,7 @@ public final class HttpHeaderConfigurations {
public static final String X_MS_UMASK = "x-ms-umask";
public static final String X_MS_NAMESPACE_ENABLED = "x-ms-namespace-enabled";
public static final String X_MS_ABFS_CLIENT_LATENCY =
"x-ms-abfs-client-latency";
+ public static final String EXPECT = "Expect";
Review Comment:
Done.
> ABFS: Add changes for expect hundred continue header with append requests
> -------------------------------------------------------------------------
>
> Key: HADOOP-18146
> URL: https://issues.apache.org/jira/browse/HADOOP-18146
> Project: Hadoop Common
> Issue Type: Sub-task
> Affects Versions: 3.3.1
> Reporter: Anmol Asrani
> Assignee: Anmol Asrani
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> Heavy load from a Hadoop cluster lead to high resource utilization at FE
> nodes. Investigations from the server side indicate payload buffering at
> Http.Sys as the cause. Payload of requests that eventually fail due to
> throttling limits are also getting buffered, as its triggered before FE could
> start request processing.
> Approach: Client sends Append Http request with Expect header, but holds back
> on payload transmission until server replies back with HTTP 100. We add this
> header for all append requests so as to reduce.
> We made several workload runs with and without hundred continue enabled and
> the overall observation is that :-
> # The ratio of TCP SYN packet count with and without expect hundred continue
> enabled is 0.32 : 3 on average.
> # The ingress into the machine at TCP level is almost 3 times lesser with
> hundred continue enabled which implies a lot of bandwidth save.
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