[SPARK-29476][WEBUI] add tooltip for Thread
### What changes were proposed in this pull request? Adding tooltip for Thread Dump - Thread Locks Before: ![Screenshot from 2019-11-04 17-11-22](https://user-images.githubusercontent.com/51401130/68127349-b963f580-ff3b-11e9-8547-e01907382632.png) After: ![Screenshot from 2019-11-13 18-12-54](https://user-images.githubusercontent.com/51401130/68768698-08e7a700-0649-11ea-804b-2eb4d5f162b4.png) ### Why are the changes needed? Thread Dump tab do not have any tooltip for the columns, Some page provide tooltip , inorder to resolve the inconsistency and for better user experience. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Manual Closes #26386 from PavithraRamachandran/threadDump_tooltip. Authored-by: Pavithra Ramachandran <pavi.rams@gmail.com> Signed-off-by: Sean Owen <sean.owen@databricks.com>
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@ -89,7 +89,12 @@ private[ui] class ExecutorThreadDumpPage(
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<th onClick="collapseAllThreadStackTrace(false)">Thread ID</th>
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<th onClick="collapseAllThreadStackTrace(false)">Thread Name</th>
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<th onClick="collapseAllThreadStackTrace(false)">Thread State</th>
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<th onClick="collapseAllThreadStackTrace(false)">Thread Locks</th>
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<th onClick="collapseAllThreadStackTrace(false)">
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<span data-toggle="tooltip" data-placement="top"
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title="Objects whose lock the thread currently holds">
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Thread Locks
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</span>
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</th>
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</thead>
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<tbody>{dumpRows}</tbody>
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</table>
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