)]}'
{
  "commit": "44a75d9ea8a549d5eb3ab155bcca530b4e0ad595",
  "tree": "22eee76678ddc53816c4d0585cb29200c8ae3d12",
  "parents": [
    "231f5d9baf8502e581605c645b4a11bbc904a314"
  ],
  "author": {
    "name": "Shawn Pearce",
    "email": "spearce@spearce.org",
    "time": "Sat Aug 19 11:28:34 2017 -0700"
  },
  "committer": {
    "name": "Shawn Pearce",
    "email": "spearce@spearce.org",
    "time": "Mon Aug 21 15:39:08 2017 -0700"
  },
  "message": "reftable: explicitly store update_index per ref\n\nAdd an update_index to every reference in a reftable, storing the\nexact transaction that last modified the reference.  This is necessary\nto fix some merge race conditions.\n\nConsider updates at T1, T3 are present in two reftables.  Compacting\nthese will create a table with range [T1,T3].  If T2 arrives during\nor after the compaction its impossible for readers to know how to\nmerge the [T1,T3] table with the T2 table.\n\nWith an explicit update_index per reference, MergedReftable is able to\nindividually sort each reference, merging individual entries at T3\nfrom [T1,T3] ahead of identically named entries appearing in T2.\n\nChange-Id: Ie4065d4176a5a0207dcab9696ae05d086e042140\n",
  "tree_diff": [
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