GitHub user JoshRosen opened a pull request: https://github.com/apache/spark/pull/2852
[WIP] Add WebUITableBuilder to simplify table-building code This work-in-progress commit illustrates a weekend hack project that I came up with for significantly simplifying the web UI's table rendering code. See the huge block comment in `WebUITableBuilder` for more details. This isn't ready to merge yet; I wanted to get some feedback before converting the rest of the table construction code to use this (I know that I should open a JIRA for this, too; I'll do it tomorrow). Essentially, this commit adds a small builder class for constructing objects that know how to render web UI tables. This builder helps us to avoid several sources of errors / maintenance headaches, such as duplicate/boilerplate markup, inconsistent formatting of columns in different tables (e.g. durations or memory being displayed differently), separation of column names from column data values, etc. This is best illustrated by some sample code; this new framework lets you write ```scala private val appTable: UITable[ApplicationInfo] = { val builder = new UITableBuilder[ApplicationInfo]() import builder._ customCol("ID") { app => <a href={"app?appId=" + app.id}>{app.id}</a> } col("Name") { _.id } intCol("Cores") { _.coresGranted } memCol("Memory per Node") { _.desc.memoryPerSlave } dateCol("Submitted Time") { _.submitDate } col("User") { _.desc.user } col("State") { _.state.toString } durationCol("Duration") { _.duration } build } ``` to render the "applications" table in the standalone Master UI. I find this significantly easier to understand and maintain than the old code. For example, this makes it trivial to re-order columns. You can merge this pull request into a Git repository by running: $ git pull https://github.com/JoshRosen/spark webui-table-builder Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/2852.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #2852 ---- commit c0aca09d676ce750496451f3691c5f9e861103bd Author: Josh Rosen <joshro...@databricks.com> Date: 2014-10-20T06:02:29Z Add WebUITableBuilder to clean up table building code. This significantly simplifies / abstracts the web UI's table construction code, which seems to account for the majority of the UI code. I haven't converted all tables to use this yet; this commit just provides the basic framework and a few example usages in the master web UI. ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org