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https://issues.apache.org/jira/browse/YARN-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Kambatla updated YARN-1741:
-----------------------------------
Target Version/s: 2.6.0 (was: 2.5.0)
> XInclude support broken for YARN ResourceManager
> ------------------------------------------------
>
> Key: YARN-1741
> URL: https://issues.apache.org/jira/browse/YARN-1741
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.4.0
> Reporter: Eric Sirianni
> Assignee: Xuan Gong
> Priority: Critical
> Labels: regression
>
> The XInclude support in Hadoop configuration files (introduced via
> HADOOP-4944) was broken by the recent {{ConfigurationProvider}} changes to
> YARN ResourceManager. Specifically, YARN-1459 and, more generally, the
> YARN-1611 family of JIRAs for ResourceManager HA.
> The issue is that {{ConfigurationProvider}} provides a raw {{InputStream}} as
> a {{Configuration}} resource for what was previously a {{Path}}-based
> resource.
> For {{Path}} resources, the absolute file path is used as the {{systemId}}
> for the {{DocumentBuilder.parse()}} call:
> {code}
> } else if (resource instanceof Path) { // a file resource
> ...
> doc = parse(builder, new BufferedInputStream(
> new FileInputStream(file)), ((Path)resource).toString());
> }
> {code}
> The {{systemId}} is used to resolve XIncludes (among other things):
> {code}
> /**
> * Parse the content of the given <code>InputStream</code> as an
> * XML document and return a new DOM Document object.
> ...
> * @param systemId Provide a base for resolving relative URIs.
> ...
> */
> public Document parse(InputStream is, String systemId)
> {code}
> However, for loading raw {{InputStream}} resources, the {{systemId}} is set
> to {{null}}:
> {code}
> } else if (resource instanceof InputStream) {
> doc = parse(builder, (InputStream) resource, null);
> {code}
> causing XInclude resolution to fail.
> In our particular environment, we make extensive use of XIncludes to
> standardize common configuration parameters across multiple Hadoop clusters.
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