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  1. Core Server
  2. SERVER-5022

full document always loaded for matches if there is a chunk manager

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Done
    • None
    • 2.7.6
    • Querying, Sharding
    • None
    • Fully Compatible

    Description

      This renders covered indexes ineffective when shardingState.needShardChunkManager(pq.ns()) is true. Not sure if this is true in all sharding setups or just some.

                      DiskLoc cl = _c->currLoc();
      		 
                      if ( _chunkManager && ! _chunkManager->belongsToMe( cl.obj() ) ) { // TODO: should make this covered at some point
      		 
                          _nChunkSkips++;
      		 
                          // log() << "TEMP skipping un-owned chunk: " << _c->current() << endl;
      		 
                      }

      Attachments

        1. test-index-covered.py
          2 kB
          Alexander Komyagin

        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. DOCS-2793 Document that sharded clusters don't support covered queries

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-3334 Stop processing bson fields in projection.transform after projections met (esp. _id)

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Backlog
          related to

          Task - A task that needs to be done. DOCS-4571 In 2.8 sharded clusters support covered queries

          • Major - P3 - Major loss of function.
          • Closed

          Activity

            People

              greg_10gen Greg Studer
              aaron Aaron Staple
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              Dates

                Created:
                Updated:
                Resolved: