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  1. Core Server
  2. SERVER-36496

Cache pressure issues during oplog replay in initial sync

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major - P3
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: Backlog
    • Component/s: None
    • Labels:
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      Description

      During oplog replay in initial sync we don't advance the oldest timestamp. This can pin a lot of data in the cache. Resulting symptoms include

      • slow initial sync due to resulting cache churn
      • growth of lookaside (cache overflow) table and corresponding file WiredTigerLAS.wt
      • in extreme cases cache-full hangs were observed. This was believed fixed with SERVER-33191, but we should be alert for new occurrences of this issue.

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              Assignee:
              backlog-server-repl Backlog - Replication Team
              Reporter:
              bruce.lucas Bruce Lucas
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                Dates

                Created:
                Updated: