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https://issues.apache.org/jira/browse/HDFS-14092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-14092 stopped by Siyao Meng.
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> Remove two-step create/append in WebHdfsFileSystem
> --------------------------------------------------
>
> Key: HDFS-14092
> URL: https://issues.apache.org/jira/browse/HDFS-14092
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: webhdfs
> Affects Versions: 3.2.0
> Reporter: Daniel Templeton
> Assignee: Siyao Meng
> Priority: Major
>
> Per the javadoc on the {{WebHdfsFileSystem.connect()}} method:
> {code} /**
> * Two-step requests redirected to a DN
> *
> * Create/Append:
> * Step 1) Submit a Http request with neither auto-redirect nor data.
> * Step 2) Submit another Http request with the URL from the Location
> header
> * with data.
> *
> * The reason of having two-step create/append is for preventing clients
> to
> * send out the data before the redirect. This issue is addressed by the
> * "Expect: 100-continue" header in HTTP/1.1; see RFC 2616, Section 8.2.3.
> * Unfortunately, there are software library bugs (e.g. Jetty 6 http
> server
> * and Java 6 http client), which do not correctly implement "Expect:
> * 100-continue". The two-step create/append is a temporary workaround for
> * the software library bugs.
> *
> * Open/Checksum
> * Also implements two-step connects for other operations redirected to
> * a DN such as open and checksum
> */{code}
> We should validate that it's safe to remove the two-step process and do so.
> FYI, [~smeng].
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