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  1. Kudu
  2. KUDU-2395

Thread spike with all threads blocked in libnss

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Details

    • Bug
    • Status: Resolved
    • Minor
    • Resolution: Fixed
    • None
    • NA
    • consensus, tserver, util
    • None

    Description

      I saw the thread count on a server under a load test spike from 280 threads (fairly constant) to 3400 threads (briefly). I checked the diagnostics log and found that there are several thousand threads in a stack like:

      0x7facce018606 _nss_files_gethostbyname2_r
  0x345a703645 <unknown>
  0x345a6d0b3b <unknown>
  0x345a6d2d80 <unknown>
     0x1c9366c kudu::(anonymous namespace)::GetAddrInfo()
     0x1c95fbe kudu::HostPort::ResolveAddresses()
      0xac4b78 kudu::consensus::(anonymous namespace)::CreateConsensusServiceProxyForHost()
      0xac5058 kudu::consensus::RpcPeerProxyFactory::NewProxy()
      0xb0b212 kudu::consensus::LeaderElection::LeaderElection()
      0xafab80 kudu::consensus::RaftConsensus::StartElection()
      0xafd20c kudu::consensus::RaftConsensus::ReportFailureDetectedTask()
     0x1ccf4ed kudu::FunctionRunnable::Run()

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        Issue Links

          is related to

          Improvement - An improvement or enhancement to an existing feature or task. KUDU-2244 spinlock contention in raft_consensus

          • Major - Major loss of function.
          • Open
          relates to

          New Feature - A new feature of the product, which has yet to be developed. KUDU-2791 Consider adding a short ttl-cache for dns lookups

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. KUDU-75 Allow RPC proxies to take HostPort and do DNS resolution inline with calls

          • Major - Major loss of function.
          • Resolved

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              Unassigned Unassigned
              tlipcon Todd Lipcon
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              Dates

                Created:
                Updated:
                Resolved: