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(Updated Jan. 30, 2016, 1:16 a.m.)

Review request for mesos and Joris Van Remoortere.


Added unit test.

Bugs: MESOS-4546

Repository: mesos


The previous implementation of `GroupProcess` tried to establish a single
ZooKeeper connection on startup, but didn't attempt to retry. ZooKeeper will
retry internally, but it only retries by attempting to reconnect to a list of
previously resolved IPs; it doesn't attempt to re-resolve those IPs to pickup
updates to DNS configuration. Because DNS configuration can be quite dynamic,
we now close the current Zk handle and open a new one if we've seen a
successful `zookeeper_init` but haven't been connected within the ZooKeeper
session timeout.

Diffs (updated)

  src/tests/group_tests.cpp 77349465e0163c8aa6bed6deefe3f98efb442f3d 
  src/zookeeper/group.hpp cf82fec290a2fa9bec122539c2eb0f12b45c2fb2 
  src/zookeeper/group.cpp 2ae3193e0e138c90b205d45400d80e80853e1b99 
  src/zookeeper/zookeeper.cpp 3c4fdad972dcd1728c52a05970646c713dcf98c8 

Diff: https://reviews.apache.org/r/42988/diff/

Testing (updated)

make check, on both OSX and Arch Linux. Manually configured a situation in 
which the Mesos agent uses stale DNS information in a loop: validated that 
without the patch, we don't pickup DNS changes, whereas with the patch, we do.

Also added a new unit test. Verified that the test fails w/o this patch applied 
and passes deterministically (`gtest_repeat=100`) with the patch applied.


Neil Conway

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