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  1. ZooKeeper
  2. ZOOKEEPER-2184

Zookeeper Client should re-resolve hosts when connection attempts fail

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Details

    • Bug
    • Status: Closed
    • Blocker
    • Resolution: Fixed
    • 3.4.6, 3.4.7, 3.4.8, 3.4.9, 3.4.10, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.4.11
    • 3.6.0, 3.4.13, 3.5.5
    • java client

    • Ubuntu 14.04 host, Docker containers for Zookeeper & Kafka

    Description

      Testing in a Docker environment with a single Kafka instance using a single Zookeeper instance. Restarting the Zookeeper container will cause it to receive a new IP address. Kafka will never be able to reconnect to Zookeeper and will hang indefinitely. Updating DNS or /etc/hosts with the new IP address will not help the client to reconnect as the zookeeper/client/StaticHostProvider resolves the connection string hosts at creation time and never re-resolves.

      A solution would be for the client to notice that connection attempts fail and attempt to re-resolve the hostnames in the connectString.

      Attachments

        1. ZOOKEEPER-2184.patch
          8 kB
          Robert P. Thille

        Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. KAFKA-4041 kafka unable to reconnect to zookeeper behind an ELB

          • Blocker - Blocks development and/or testing work, production could not run
          • Resolved
          duplicates

          New Feature - A new feature of the product, which has yet to be developed. ZOOKEEPER-338 zk hosts should be resolved periodically for loadbalancing amongst zk servers.

          • Major - Major loss of function.
          • Open
          fixes

          Bug - A problem which impairs or prevents the functions of the product. SOLR-8868 SolrCloud: if zookeeper loses and then regains a quorum, Solr nodes and SolrJ Client do not recover and need to be restarted

          • Major - Major loss of function.
          • Resolved
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. ZOOKEEPER-1666 Avoid Reverse DNS lookup if the hostname in connection string is literal IP address.

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

          Improvement - An improvement or enhancement to an existing feature or task. MESOS-9113 Update vendored zookeeper to 3.4.13

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. ZOOKEEPER-1506 Re-try DNS hostname -> IP resolution if node connection fails

          • Blocker - Blocks development and/or testing work, production could not run
          • Resolved
          links to

          Web Link GitHub Pull Request #150

          Web Link GitHub Pull Request #199

          Web Link GitHub Pull Request #199

          Web Link GitHub Pull Request #451

          Web Link GitHub Pull Request #534

          Activity

            People

              andor Andor Molnar
              rthille Robert P. Thille
              Votes:
              16 Vote for this issue
              Watchers:
              38 Start watching this issue

              Dates

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                Updated:
                Resolved:

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