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Make buffer time between last modified on disk and last modified on last save configurable #3273

merged 3 commits into from Feb 5, 2018


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gnestor commented Jan 28, 2018

Suggested by #484 (comment)

This will look in notebook.json in ~/.jupyter/nbconfig/notebook.json for a last_modified_buffer value. For example:

  "Notebook": {
    "Header": false,
    "Toolbar": true
  "Cell": {
    "cm_config": {
      "lineNumbers": false
  "last_modified_buffer": 600

Can anyone think of better name than last_modified_buffer?


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takluyver commented Jan 28, 2018

I'm trying to think of a better word than 'buffer', because that suggests a temporary storage area for data. Maybe last_modified_check_margin?

Also, I might make the config option in seconds rather than milliseconds; I think we generally try to keep intervals in seconds throughout our API for consistency (cc @minrk )

// We want to check last_modified (disk) > that.last_modified (our last save)
// In some cases the filesystem reports an inconsistent time,
// so we allow 0.5 seconds difference before complaining.
if ((last_modified.getTime() - that.last_modified.getTime()) > 500) { // 500 ms
// so we allow 0.5 seconds (configurable in nbconfig/notebook.json as `last_modified_buffer`) difference before complaining.

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takluyver Feb 2, 2018


Don't forget to update the name in the comment too.

@takluyver takluyver merged commit 364cd03 into jupyter:master Feb 5, 2018

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@gnestor gnestor deleted the gnestor:issue-484 branch Feb 6, 2018


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brettbrocato commented Feb 12, 2019

I have tried "last_modified_buffer": 2 and "last_modified_check_margin": 3, assuming they're in seconds. They both cause all my notebooks to return a 500 error.

I've been trying to avoid the "overwrite?" dialog, which pops up as frequently as every 5 minutes. I'm on Win10 and notebook 5.7.0



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