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  1. Couchbase Server
  2. MB-54366

[BP-7.0.5] - XDCR Metakv callbacks racing when remote cluster ref is added/changed

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    Description

      Multiple callbacks are allowed to run for metakv listener. These normally run fine as these do not take much time. But in-case the callbacks take time (e.g due to long DNS look-up time) then the order in which changes happen in metakv are applied out-of-order.

      This is because the a spawned callback gets stalled and in the meantime, the metakv gets modified. This stalled callback overrides with values.

      All this gets manifested with error: 

      Error writing to metakv: revision number does not match

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MB-54424 XDCR - Unexpected server error (500)

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          is a backport of

          Bug - A problem which impairs or prevents the functions of the product. MB-52156 XDCR - Metakv callbacks racing when remote cluster ref is added/changed

          • Major - Major loss of function.
          • Resolved
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MB-54424 XDCR - Unexpected server error (500)

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          For Gerrit Dashboard: MB-54366
          # Subject Branch Project Status CR V
          182235,3 MB-54366: Fix racing of metakv callbacks for remote clusters cheshire-cat goxdcr Status: MERGED +2 +1
          182348,3 MB-54366: fix to add missing unlock in error path cheshire-cat goxdcr Status: MERGED +2 +1

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              sudeep.jathar Sudeep Jathar
              neil.huang Neil Huang
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              Dates

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                Updated:
                Resolved:

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