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Fix multiple memory leaks in UserCountryMap #11350

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merged 3 commits into from Mar 27, 2017

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jvilk commented Feb 17, 2017

See commits for details. The Raphael upgrade fixes the most serious memory leak.

You can verify the problem(s) by following these steps.

Prerequisites: The map is visible on the dashboard (i.e., piwik has collected data recently)

Steps:

  1. Navigate to the dashboard.
  2. Take a heap snapshot in Chrome, and note the size.
  3. Click on the "Dashboard" link in the left menu to reload the dashboard without refreshing the page.
  4. Take another heap snapshot. Note that it has grown by ~10MB!

After about 150 dashboard navigations, Piwik will crash the tab in Chrome because it has filled the heap. (Chrome has a JavaScript heap size of 1.4GB)

In addition, every time you click on the "Dashboard" link in the left menu, Piwik appends a link element to the end of the body containing the CSS for the map. You can view this in the "Elements" tab of Chrome's development tools.

@mattab mattab added this to the 3.0.2 milestone Feb 18, 2017

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mattab commented Feb 18, 2017

Thank you @jvilk for the nice Pull request! We will review this for the next Piwik release 3.0.2

jvilk pushed a commit to jvilk/raphael that referenced this pull request Feb 19, 2017

John Vilk
Change Element.removeData to actually remove keys from data map
Without this change, it is very easy for an application to slowly leak memory as Raphael continues to add new keys to `eldata`.

This memory leak turns out to be a problem for [Piwik](https://piwik.org/), which uses
kartographer.js (which uses raphael) to draw an SVG image of the United States
in its analytics dashboard ([see demo](https://demo.piwik.org/index.php?module=CoreHome&action=index&idSite=3&period=day&date=yesterday)).

Every time the dashboard is redrawn, it spawns ~700 new Elements with data. [I've submitted a pull request that appropriately cleans up this data when the user navigates away from the page using `removeData`](matomo-org/matomo#11350), but Raphael leaves an empty object in the `eldata` map keyed on the element's old ID. Since kartographer/Piwik does not reuse IDs, `eldata` will grow continually on each redraw until the application is out of memory.
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jvilk commented Feb 19, 2017

Note that there is still a tiny small memory leak caused by Raphael's behavior. I've submitted a PR to Raphael that eliminates this tiny memory leak.

Regardless, this PR alone turns the large memory leak into a tiny memory leak, so it is worth considering / merging before Raphael considers/merges the other fix.

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@mattab

mattab Feb 21, 2017

Member

Hi @jvilk
Latest Raphael version seems to be 2.2.7
https://github.com/DmitryBaranovskiy/raphael/releases/tag/v2.2.7

could we maybe use this latest version instead of 2.2.1?

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@jvilk

jvilk Feb 22, 2017

Contributor

@mattab Done. Rebased and updated commit.

@mattab mattab modified the milestones: 3.0.3, 3.0.2 Feb 21, 2017

John Vilk added some commits Feb 17, 2017

John Vilk
Upgrade to Raphael 2.2.7 to fix serious memory leak in UserCountryMap
Kartograph stores data on SVG paths using Raphael:

https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L30

Raphael stores this data in a *global* map, keyed on the path's ID:

https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L3168

https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L306

UserCountryMap does the right thing and calls clear() on the Kartograph map to reclaim memory...:

https://github.com/piwik/piwik/blob/6fab62e2229f9efadbcf43ff541b46f007fc6323/plugins/UserCountryMap/javascripts/visitor-map.js#L1332

...which eventually calls `remove` on each of these SVG paths:

https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L70

However, previous versions of Raphael (including 2.1.0) fail to call `removeData` to clear out the data associated with the SVG path in the global map,
leading to a serious memory leak (heap grows by ~10MB each time the map refreshes):

https://github.com/DmitryBaranovskiy/raphael/blob/7ba1a8258be64fdb517bc78fde44ff0e6188ca05/raphael.js#L4475

Later versions, including the latest 2.2.1, properly call `removeData` when `remove` is called:

https://github.com/DmitryBaranovskiy/raphael/blob/master/raphael.js#L6842
John Vilk
Properly remove window resize event listener for UserCountryMap
The previous version of the code inappropriately tried to remove the event listener;
the `function` object for `onResizeLazy` is different across maps.
@sgiehl

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sgiehl commented Mar 27, 2017

@jvilk thanks for that PR. Seems to fix the memory leak in this case.

I'm gonna merge this now.

While testing I maybe found another memory leak. When clicking the reload button for the usercountry widget the required memory still increases a lot, guess the widget is not destroyed before it's reloaded or something similar. Would you maybe be keen to have a look at that, too?

@sgiehl sgiehl merged commit 7788993 into matomo-org:3.x-dev Mar 27, 2017

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