Some help diagnosing sync gateway error

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1

I’ve got an error in my sync gateway logs that keeps repeating. I have a document and I see the error (below). The document if I view it in the sync gateway is at rev 32-d43…, but the error message (JS sync function (500 Exception in JS sync function)) is concerned with rev 30-381… which I don’t think exists in the system any more. I’m not too good at reading these error messages yet, any idea what’s going on?

2016-10-14T10:37:12.010+01:00 CRUD+: Invoking sync on doc "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" rev 30-381fb99a781a5f85ee286d45f02d447d
2016-10-14T10:37:12.011+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "29-e3fc0bae30c8c8d633c67f9ae0cadd4a"
2016-10-14T10:37:12.011+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "28-a8163fc14ec99a4beab3ff6f319c6f50"
2016-10-14T10:37:12.011+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "27-a957574972abdacf4414d80de697b69a"
2016-10-14T10:37:12.011+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "26-e2f6054459725bca4a89ee46e7e9dda5"
2016-10-14T10:37:12.012+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "25-fec5e1c3a817f937e023025de6baf555"
2016-10-14T10:37:12.012+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "24-a979a2698097fe0b0632c0e3169ff824"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "23-d9105df2020b860fb6581d3eca5f63fc"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "22-7f997f2d2198015283f3e351c96f18d4"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "21-26bedb9f943e1b1c32db1aaea24d9e1f"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "20-fca3bd582f795ee4cbe1e4b37fb365d1"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "19-bc9ea61ebf96f7987fc32b9eb8740667"
2016-10-14T10:37:12.013+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "18-3f194a0e3d205f664ae97d4b6b59f99f"
2016-10-14T10:37:12.014+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "17-f61b8a2804db6fbbf7d6c9c1d7ed4c18"
2016-10-14T10:37:12.014+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "16-a6f40134d55a55b4c18213bc0e34f40f"
2016-10-14T10:37:12.014+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "15-2c83eafe99834e1efb14d28f8f7eb9ce"
2016-10-14T10:37:12.016+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "14-810fb717984736f62a278e6e1f13c0e0"
2016-10-14T10:37:12.016+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "13-6370a202b8c30dde6bda2a24f1b008e8"
2016-10-14T10:37:12.016+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "12-f47160a2d72bb31c7c005b80e5965c8d"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "11-0e1e63fc909416907854c4d515b18561"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "10-d48c5021d9426cee6e3dc2a873ae85d3"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "9-971fffc9b7408b1dad49015bcba41cdc"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "8-2feaff0bd17b21e6742626082d2bc5cc"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "7-1035bb2dc62f2becc1ef111a6b1ecf78"
2016-10-14T10:37:12.017+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "6-e2cb5506fdd990bcd933d8ad196022fa"
2016-10-14T10:37:12.018+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "5-404586475703963faae4ca7a96402aae"
2016-10-14T10:37:12.018+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "4-297ca9748c3bcbd7f880e51b6efe82df"
2016-10-14T10:37:12.018+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "3-fac87e07690161622e74cf6b3a01777d"
2016-10-14T10:37:12.018+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "2-8f28949663f7b84886316b80d3a34664"
2016-10-14T10:37:12.018+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "1-ddde39806367b1cb158a211eb9e50033"
2016-10-14T10:37:12.023+01:00 WARNING: Sync fn exception: TypeError; doc = map[_rev:30-381fb99a781a5f85ee286d45f02d447d _deleted:%!s(bool=true) _revisions:map[ids:[381fb99a781a5f85ee286d45f02d447d e3fc0bae30c8c8d633c67f9ae0cadd4a a8163fc14ec99a4beab3ff6f319c6f50 a957574972abdacf4414d80de697b69a e2f6054459725bca4a89ee46e7e9dda5 fec5e1c3a817f937e023025de6baf555 a979a2698097fe0b0632c0e3169ff824 d9105df2020b860fb6581d3eca5f63fc 7f997f2d2198015283f3e351c96f18d4 26bedb9f943e1b1c32db1aaea24d9e1f fca3bd582f795ee4cbe1e4b37fb365d1 bc9ea61ebf96f7987fc32b9eb8740667 3f194a0e3d205f664ae97d4b6b59f99f f61b8a2804db6fbbf7d6c9c1d7ed4c18 a6f40134d55a55b4c18213bc0e34f40f 2c83eafe99834e1efb14d28f8f7eb9ce 810fb717984736f62a278e6e1f13c0e0 6370a202b8c30dde6bda2a24f1b008e8 f47160a2d72bb31c7c005b80e5965c8d 0e1e63fc909416907854c4d515b18561] start:%!s(float64=30)] _id:3bd85e31-5560-4a2d-a63f-3e16a1d2814d] -- db.(*Database).getChannelsAndAccess() at crud.go:871
2016-10-14T10:37:12.023+01:00 	BulkDocs: Doc "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" --> 500 Exception in JS sync function (500 Exception in JS sync function)

And here’s the doc:

{
  "owner": "7f3b03b8-340d-4d41-80f9-d4ebec187216",
  "read_receipts_by_owner": {
    "95ee00f0-6f24-4553-8228-d045c4b4289d": "9a6f69e9-1e7a-44bd-984c-c7f70932824a",
    "86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3": "72ea4420-9a39-4ab0-a035-b3d1dda8ac05"
  },
  "_sync": {
    "time_saved": "2016-10-05T12:00:34.702907659+01:00",
    "sequence": 396868,
    "rev": "32-d4319144f7b3c1c64a77e17f3b76c979",
    "history": {
      "channels": [
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216"
        ],
        [
          "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216",
          "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3",
          "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d"
        ]
      ],
      "revs": [
        "18-3f194a0e3d205f664ae97d4b6b59f99f",
        "31-3440198aecb07364e3e8358ba9c2c627",
        "10-d48c5021d9426cee6e3dc2a873ae85d3",
        "25-fec5e1c3a817f937e023025de6baf555",
        "21-26bedb9f943e1b1c32db1aaea24d9e1f",
        "13-6370a202b8c30dde6bda2a24f1b008e8",
        "7-1035bb2dc62f2becc1ef111a6b1ecf78",
        "5-404586475703963faae4ca7a96402aae",
        "26-e2f6054459725bca4a89ee46e7e9dda5",
        "20-fca3bd582f795ee4cbe1e4b37fb365d1",
        "28-a8163fc14ec99a4beab3ff6f319c6f50",
        "17-f61b8a2804db6fbbf7d6c9c1d7ed4c18",
        "12-f47160a2d72bb31c7c005b80e5965c8d",
        "22-7f997f2d2198015283f3e351c96f18d4",
        "32-d4319144f7b3c1c64a77e17f3b76c979",
        "30-7bbb7bc7c258669226aa9913c2721445",
        "29-e3fc0bae30c8c8d633c67f9ae0cadd4a",
        "15-2c83eafe99834e1efb14d28f8f7eb9ce",
        "9-971fffc9b7408b1dad49015bcba41cdc",
        "11-0e1e63fc909416907854c4d515b18561",
        "27-a957574972abdacf4414d80de697b69a",
        "14-810fb717984736f62a278e6e1f13c0e0",
        "16-a6f40134d55a55b4c18213bc0e34f40f",
        "19-bc9ea61ebf96f7987fc32b9eb8740667",
        "6-e2cb5506fdd990bcd933d8ad196022fa",
        "1-ddde39806367b1cb158a211eb9e50033",
        "23-d9105df2020b860fb6581d3eca5f63fc",
        "24-a979a2698097fe0b0632c0e3169ff824",
        "2-8f28949663f7b84886316b80d3a34664",
        "4-297ca9748c3bcbd7f880e51b6efe82df",
        "3-fac87e07690161622e74cf6b3a01777d",
        "8-2feaff0bd17b21e6742626082d2bc5cc"
      ],
      "parents": [
        11,
        15,
        18,
        27,
        9,
        12,
        24,
        29,
        3,
        23,
        20,
        22,
        19,
        4,
        1,
        16,
        10,
        21,
        31,
        2,
        8,
        5,
        17,
        0,
        7,
        -1,
        13,
        26,
        25,
        30,
        28,
        6
      ]
    },
    "channels": {
      "ch_private_95ee00f0-6f24-4553-8228-d045c4b4289d": null,
      "ch_private_7f3b03b8-340d-4d41-80f9-d4ebec187216": null,
      "ch_private_86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3": null
    },
    "recent_sequences": [
      277869,
      277912,
      277955,
      277998,
      278041,
      278084,
      278240,
      278283,
      385894,
      388826,
      396868
    ]
  },
  "delivery_receipts_by_owner": {
    "95ee00f0-6f24-4553-8228-d045c4b4289d": "5ec82a0e-38d9-4024-ba06-cb28ab1a7fba",
    "86fc56d2-f1d3-4b9d-bcf5-5fc9f09fbdb3": "aa0bb6f5-3aa5-431b-a263-1301831f5a62"
  },
  "type": "chat-message",
  "content": {
    "imageAsset": {
      "isVertical": false,
      "fileSize": 363489,
      "location": null,
      "mimeType": "image/jpeg",
      "geoData": null,
      "thumbnailUri": null,
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        "height": 4032
      },
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    },
    "type": "image"
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  "client_timestamp_utc": "2016-09-05T08:54:51Z",
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    }
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    "user_id": "admin",
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2

The doc body from Couchbase Server is indeed rev-32 but from the logs the error is happening on rev-30.

Here’s my somewhat logical interpretation.

The meaning of No old revision in the logs seems to indicate it couldn’t find the parent revision. I’m guessing that in processing rev-30 in the Sync Function, Sync Gateway needs to retrieve the parent revision (second argument in the Sync Function). If 2016-10-14T10:37:12.011+01:00 CRUD+: No old revision "3bd85e31-5560-4a2d-a63f-3e16a1d2814d" / "29-e3fc0bae30c8c8d633c67f9ae0cadd4a" means that it couldn’t find the direct parent then it would try to load rev-28 and so on until it reaches rev-1. Then since it can’t find a parent rev it calls the Sync Function with null as the parent revision. oldDoc in the signature below.

function (doc, oldDoc) {
  ...
}

The Sync Function is usually called with null as the parent revision for document creation (rev-1s) but maybe your Sync Function expects the parent revision to be a dictionary (to access a property on it) and because there isn’t one it throws a type error when it sees oldDoc is null?

James

3

Good theory! Thanks - I’ll investigate.

Am I right in thinking that new docs don’t have a parent? So this doc would look similar to the sync function?

4

Yes, docs with a revision number like 1-... are first generation and don’t have a parent. So in that case oldDoc is null in the sync function. If you can share your sync function in a GitHub gist it might help to find out if there’s something that could cause this JS exception.

5

Actually the first thing to check is whether you are using oldDoc in the sync function?

6

I am using oldDoc in places…

7

I don’t see anything that could cause a JS error.

If you can repro it, you could log the keys of doc and oldDoc and see what they are just before the TypeError occurs

  console.log("doc :: " + _.keys(doc));
  if (oldDoc) {
    console.log("oldDoc :: " + _.keys(oldDoc));
  }

The underscore lib is available in the Sync Function, we should document this.

From the logs, it appears that the error is happening at crud.go:871 in the source of sync gateway. Might be worth to dig there too to see what happens in getChannelsAndAccess.

James

8

But I’ve no idea where the error occurs. There’s very little information in the error message

9

@adamf can you help out here in reading the error message (see logs in 1st message of this thread ↑ ).

10

Line 116 in your sync function looks like the only place you’re using oldDoc without checking whether it exists. It’s possible that a client is trying to push an older _deleted document (rev 30-381…), and Sync Gateway isn’t able to identify an ancestor for that revision.

11

What Adam said — I found the same line before seeing his comment.

  if (newDoc._deleted) {
    assignToChannels(oldDoc);

If oldDoc is undefined, this will fail inside assignToChannels.

12

Of course. Thanks for spotting that. Didn’t envisage the situation where a doc could be deleted with there being an old doc.

13

Hi, how finally was the solution to avoid "No old revisions"
something like this:
if (newDoc._deleted) {
if(oldDoc && !oldDoc._deleted){
assignToChannels(oldDoc);
}
}
because a i have a similar problem with “No old revisions” log. and that only happens on production and my local environment doesnt happen so I want to make sure to do the right. thanks

14

Yes, so just because a document gets deleted (or indeed modified), that does not mean that there will be a prior revision. I guess they get cleaned up from time to time.