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https://issues.apache.org/jira/browse/HADOOP-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vivek Ratan updated HADOOP-1974:
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Attachment: 1974_patch02
In my earlier patch, I had forgotten to use just the relative path to the
files. That has been fixed in this patch (1974_patch02).
> Progress node should cache root object for faster progress computation
> ----------------------------------------------------------------------
>
> Key: HADOOP-1974
> URL: https://issues.apache.org/jira/browse/HADOOP-1974
> Project: Hadoop
> Issue Type: Improvement
> Reporter: Vivek Ratan
> Assignee: Vivek Ratan
> Priority: Minor
> Attachments: 1974_patch01, 1974_patch02
>
>
> In org.apache.hadoop.util.Progress.get(), we walk through the tree of objects
> to find the root of a node, before figuring out the progress. This approach
> is not optimized, especially since get() is called frequently. Each
> Progressnode should cache its root object, and this is easy to do since nodes
> do not change their parents.
> Keeping track of the root node is also useful in synchronization issues. [see
> HADOOP-1970 for more details]. The root node can be used to synchronize the
> entire structure for methods that need to traverse the tree in different
> directions and lock nodes along the way.
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