Vladislav Tyulbashev created ZOOKEEPER-3726:
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Summary: invalid ipv6 address comparison
Key: ZOOKEEPER-3726
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3726
Project: ZooKeeper
Issue Type: Bug
Components: c client
Affects Versions: 3.5.6
Reporter: Vladislav Tyulbashev
Zookeeper C Client periodically resolves server names since
https://issues.apache.org/jira/browse/ZOOKEEPER-1355
After dns resolution ip addresses are checked against previous set of
addresses. However, currently only several bytes are checked (it is assumed,
that all addresses are ipv4 length bytes).
Case:
1) zookeeper server operates only by ipv6
2) client connects to it by some hostname (zookeeper-1.news.yandex.ru, for
example)
3) container with zookeeper server dies, new container is up, and
zookeeper-1.news.yandex.ru now points to new address
4) several bits in ipv6 address are changed
5) zookeeper client ignores changes in address, because of incorrect strcmp
size and first bytes were equal
6) zookeeper client now can't reconnect to zookeeper without manual
intervention, because it tries old address
pull request will be available shortly
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