UUIDs may be absent from shard secondary local collections

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
    • 3.6.2, 3.7.1
    • Affects Version/s: 3.6.0
    • Component/s: Sharding
    • None
    • Fully Compatible
    • ALL
    • v3.6
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      A slightly more detailed repro script and logs are attached, but the gist of it is the following:

      // init with one shard with one node rs
var st = new ShardingTest({shards: 1, rs: {nodes: 1}, mongos: 1});
var mongos = st.s;
var rs = st.rs0;

// add a node to shard rs
var newNode = rs.add({'shardsvr': ''});
rs.reInitiate();
rs.awaitSecondaryNodes();

      The new secondary has FCV=3.6, but local collections do not have UUIDs. Regular (non-local) collections do have the correct UUID however.

      Per suggestions, the fix may just be not to skip shard servers here: https://github.com/mongodb/mongo/blob/r3.6.0/src/mongo/db/repl/initial_syncer.cpp#L1098-L1119

      Show
      A slightly more detailed repro script and logs are attached, but the gist of it is the following: // init with one shard with one node rs var st = new ShardingTest({shards: 1, rs: {nodes: 1}, mongos: 1}); var mongos = st.s; var rs = st.rs0; // add a node to shard rs var newNode = rs.add({ 'shardsvr' : ''}); rs.reInitiate(); rs.awaitSecondaryNodes(); The new secondary has FCV=3.6, but local collections do not have UUIDs. Regular (non-local) collections do have the correct UUID however. Per suggestions, the fix may just be not to skip shard servers here: https://github.com/mongodb/mongo/blob/r3.6.0/src/mongo/db/repl/initial_syncer.cpp#L1098-L1119
    • Storage 2018-01-01, Storage 2018-01-15
    • 0
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    • 3
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      When a secondary is added to a shard replset with FCV=3.6, it does not generate UUIDs on the local database.

        1. added_secondary_no_uuid.log
          445 kB
          Kevin Albertson
        2. added_secondary_no_uuid.js
          1 kB
          Kevin Albertson

            Assignee:
            Maria van Keulen
            Reporter:
            Kevin Albertson
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            0 Vote for this issue
            Watchers:
            8 Start watching this issue

              Created:
              Updated:
              Resolved: