Wei-Chiu Chuang created HADOOP-15638:
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Summary: KMS Accept Queue Size default changed from 500 to 128 in
Hadoop 3.x
Key: HADOOP-15638
URL: https://issues.apache.org/jira/browse/HADOOP-15638
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 3.0.0-alpha2
Reporter: Wei-Chiu Chuang
HADOOP-13597 migrated KMS from Tomcat to Jetty.
In Hadoop 2.x, the Accept Queue Size default value was set by environment
variable KMS_ACCEPT_QUEUE with default value 500.
But after the migration, Hadoop 3.x now uses the default HttpServer2
configuration to set accept queue size (hadoop.http.socket.backlog.size), which
is 128.
Should we restore the default accept queue size in kms-default.xml? Should we
document it as a known issue? After all, Hadoop 2 --> 3 allows breaking
changing.
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