Mike Percy has submitted this change and it was merged.

Change subject: external minicluster: expand EMC dir usage
......................................................................


external minicluster: expand EMC dir usage

In order to test different disk configurations, it is becoming
increasingly important to have end-to-end testing with nodes backed
by multiple directories.

External miniclusters by default use a single directory for each
daemon's data (i.e. wals and data dirs fall under a single
/cluster/daemon/data directory). This patch adds multi-directory support
via a new 'num_data_dirs' parameter to ExternalMiniClusterOptions.
Additionally, a 'wal_dir' parameter is added to ExternalDaemonOptions to
separate the wal location from the data directories.

If 'num_data_dirs' is greater than 1, each daemon will generate multiple
paths, appending each with a numeric suffix, up to the number specified.

E.g. EMCs that would have used the path /cluster/data, if specifying
'num_data_dirs' as 3, will now generate multiple data directories
/cluster/data-0, /cluster/data-1, /cluster/data-2. The wal will be added
to /cluster/wal.

The new test multidir-cluster-itest demonstrates this.

This test has been run via dist-test 2000 with no flakes. Results here:
http://dist-test.cloudera.org/job?job_id=awong.1496701042.24862

Change-Id: Id2f5def6980ad394c8558ad97ba830f1b0257332
Reviewed-on: http://gerrit.cloudera.org:8080/6845
Reviewed-by: Adar Dembo <a...@cloudera.com>
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <t...@apache.org>
Reviewed-by: Mike Percy <mpe...@apache.org>
---
M src/kudu/integration-tests/CMakeLists.txt
M src/kudu/integration-tests/delete_table-itest.cc
M src/kudu/integration-tests/disk_reservation-itest.cc
M src/kudu/integration-tests/external_mini_cluster-itest-base.cc
M src/kudu/integration-tests/external_mini_cluster-itest-base.h
M src/kudu/integration-tests/external_mini_cluster.cc
M src/kudu/integration-tests/external_mini_cluster.h
M src/kudu/integration-tests/external_mini_cluster_fs_inspector.cc
M src/kudu/integration-tests/log_verifier.cc
M src/kudu/integration-tests/master_failover-itest.cc
M src/kudu/integration-tests/master_migration-itest.cc
A src/kudu/integration-tests/multidir_cluster-itest.cc
M src/kudu/integration-tests/open-readonly-fs-itest.cc
M src/kudu/integration-tests/ts_itest-base.h
M src/kudu/integration-tests/ts_recovery-itest.cc
15 files changed, 231 insertions(+), 61 deletions(-)

Approvals:
  Mike Percy: Looks good to me, approved
  Adar Dembo: Looks good to me, but someone else must approve
  Todd Lipcon: Looks good to me, but someone else must approve
  Kudu Jenkins: Verified



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Gerrit-MessageType: merged
Gerrit-Change-Id: Id2f5def6980ad394c8558ad97ba830f1b0257332
Gerrit-PatchSet: 25
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <aser...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: David Ribeiro Alves <davidral...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mpe...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <t...@apache.org>

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