<p>As pointed out in <a href="https://github.com/openstreetmap/operations/issues/154#issuecomment-353475540">this comment</a> by <a href="https://github.com/mmd-osm" class="user-mention">@mmd-osm</a>, diff uploads are buffered in memory before being processed. However, <a href="https://github.com/openstreetmap/operations/issues/154#issuecomment-353289168">another comment</a> points out that some transactions can take up to 2 hours to process. This seems strange, given that it should just be parsing the XML (which is slow, but not that slow) and talking to the nearby database (which is also slow, but not that slow).</p>
<p>To investigate further, we need to find a recent diff upload that took a long time to process. That should give us some clues to start with.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/issues/1710">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABWnLWYQ9PofymOcZ0eehy9ySQjD78Zfks5tC4GfgaJpZM4RK36m">mute the thread</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/ABWnLYvkTg1RfQs3kNvzgsNt5Iw0btYNks5tC4GfgaJpZM4RK36m.gif" width="1" /></p>
<div itemscope itemtype="http://schema.org/EmailMessage">
<div itemprop="action" itemscope itemtype="http://schema.org/ViewAction">
  <link itemprop="url" href="https://github.com/openstreetmap/openstreetmap-website/issues/1710"></link>
  <meta itemprop="name" content="View Issue"></meta>
</div>
<meta itemprop="description" content="View this Issue on GitHub"></meta>
</div>

<script type="application/json" data-scope="inboxmarkup">{"api_version":"1.0","publisher":{"api_key":"05dde50f1d1a384dd78767c55493e4bb","name":"GitHub"},"entity":{"external_key":"github/openstreetmap/openstreetmap-website","title":"openstreetmap/openstreetmap-website","subtitle":"GitHub repository","main_image_url":"https://cloud.githubusercontent.com/assets/143418/17495839/a5054eac-5d88-11e6-95fc-7290892c7bb5.png","avatar_image_url":"https://cloud.githubusercontent.com/assets/143418/15842166/7c72db34-2c0b-11e6-9aed-b52498112777.png","action":{"name":"Open in GitHub","url":"https://github.com/openstreetmap/openstreetmap-website"}},"updates":{"snippets":[{"icon":"DESCRIPTION","message":"Why are some diff uploads slow? (#1710)"}],"action":{"name":"View Issue","url":"https://github.com/openstreetmap/openstreetmap-website/issues/1710"}}}</script>