Sailesh Mukil 4592ed445e IMPALA-5129: Use Kudu's Kinit code to avoid expensive fork ...

Impala currently kinits by forking off a child process. This
has proved to be expensive in many cases since the subprocess
tries to reserve as much memory as Impala is currently using
which can be quite a lot.

This patch adds a flag called 'use_kudu_kinit' that defaults to
true. When it's true, it uses the Kudu security library's kinit code
that programatically uses the krb5 library to kinit.
When it's false, we run our current path which kicks off the
kinit-thread and forks off a kinit process periodically to reacquire
tickets based on FLAGS_kerberos_reinit_interval.

Converted existing tests in thrift-server-test to run with and
without kerberos. We now run this BE test with kerberos by using
Kudu's MiniKdc utility. This introduces a new dependency on some
kerberos binaries that are checked through FindKerberosPrograms.cmake.
Note that this is only a test dependency and not a dependency for
the impalad binaries and friends. Compilation will still succeed if
the kerberos binaries for the MiniKdc are not found, however, the
thrift-server-test will fail. We run with and without the
'use_kudu_kinit' flag.

TODO: Since the setting up and tearing down of our security code
isn't idempotent, we can run only any one test in a process with
Kerberos now (IMPALA-6085).

Updated bin/bootstrap_system.sh to install new sasl-gssapi
modules and the kerberos binaries required for the MiniKdc.
Also fixed a bug that didn't transfer the environment into 'sudo'
in bin/bootstrap_system.sh.

Testing: Verified with thrift-server-test and also manually on a
live kerberized cluster.

Change-Id: I9cea56cc6e7412d87f4c2e92399a2f91ea6af6c7
Reviewed-on: http://gerrit.cloudera.org:8080/7938
Reviewed-by: Sailesh Mukil <sailesh@cloudera.com>
Tested-by: Impala Public Jenkins

2017-10-27 00:19:44 +00:00

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