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https://issues.apache.org/jira/browse/HADOOP-18146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17625609#comment-17625609
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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_r1007939204
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java:
##########
@@ -32,7 +32,7 @@
public final class FileSystemConfigurations {
public static final String DEFAULT_FS_AZURE_ACCOUNT_IS_HNS_ENABLED = "";
-
+ public static final boolean
DEFAULT_FS_AZURE_ACCOUNT_IS_EXPECT_HEADER_ENABLED = true;
Review Comment:
We tested by enabling the header for low as well as high throttled workloads
and it gives better performance in both situations, hence we add it by default
with each append request.
> 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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