Tech Notes

Various questions, issues, etc. come up from time to time. Answers and workarounds will be collected here as Tech Notes.


  • TN1 — ZooKeeper watches are single threaded.
  • TN2 — InterProcessMutex acquire() can be used to return immediately if lock can't be acquired.
  • TN3 — Dealing with session failure.
  • TN4 — ZooKeeper makes a very bad Queue source.
  • TN5 — The APIs in Apache Curator are exactly the same as Netflix Curator.
  • TN6 — Friends don't let friends write ZooKeeper recipes
  • TN7 — Do not use paths passed to Curator recipes.
  • TN8 — Curator logging can be customized.
  • TN9 — NOTE: PathChildrenCache now uses getData() instead of checkExists().
  • TN10 — JVM pauses can cause unexpected client state with improperly chosen session timeouts.
  • TN11 — Curator internally wraps Watchers.
  • TN12 — Curator connection semantics
  • TN13 — Guava usage in Curator
  • TN14 — Session expiration in Curator
  • TN15 — API Changes in Curator 5.0.0 and how to workaround them if you need binary compatibility.

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