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  1. Couchbase Server
  2. MB-23517

Set -> Remove -> Set sequence of KV operations using the same key blocks the client connection

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Details

    • Bug
    • Resolution: Fixed
    • Critical
    • 5.0.0
    • 5.0.0
    • memcached
    • Build 5.0.0-2372
    • Untriaged
    • Centos 64-bit
    • Yes

    Description

      Setup:

      • 1 node, 1 bucket, value eviction.

      Test case:

      from couchbase.bucket import Bucket
      		 
       
      		 
       
      		 
      connection_string = 'couchbase://172.23.96.117/bucket-1?password=password'
      		 
       
      		 
      client = Bucket(connection_string=connection_string)
      		 
      client.timeout = 60
      		 
       
      		 
      key = 'hello'
      		 
      value = {'f': 'v'}
      		 
       
      		 
      client.set(key=key, value=value)
      		 
      client.remove(key=key)
      		 
      client.set(key=key, value=value)

      The second "set" times out after 60 seconds. All subsequent requests on the same connection will fail as well.

      According to tcpdump, memcached acknowledges the request but fails to send response back.

      Performance tests experience massive timeouts because of this issue.

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MB-23328 Memcached fails to close connection to the ejecting node when doing a swap rebalance and cause issues in deletion of the bucket on the node.

          • Test Blocker - QE-related tests can't proceed
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MB-22163 Major regression in KV write performance due to XATTR support (value eviction)

          • Major - Major loss of function.
          • Closed
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              trond Trond Norbye
              pavelpaulau Pavel Paulau (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:

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