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new 706af2d0b [tools] update 'kudu master add' in-line help
706af2d0b is described below
commit 706af2d0bc1ba6845527b967ef777c208707be20
Author: Alexey Serbin <[email protected]>
AuthorDate: Wed Nov 5 18:14:34 2025 -0800
[tools] update 'kudu master add' in-line help
Since the 'kudu master add' CLI tool has become de facto obsolete after
a significant improvement in usability of adding new Kudu masters in
the 1.16.0 release [1], it makes sense to reflect on that in the inline
tool's help/usage blurb.
This changelist does exactly so by adding an appropriate NOTE.
In addition, I updated the help message to clarify on a few crucial
points and also removed irrelevant optional flag --logtostderr
from the list of the flags advertised by the tool.
[1] https://github.com/apache/kudu/commit/7e66534d0
Change-Id: Ida92fda5d6d3f4edd9f04796efa090bef7c540bd
Reviewed-on: http://gerrit.cloudera.org:8080/23647
Tested-by: Alexey Serbin <[email protected]>
Reviewed-by: Abhishek Chennaka <[email protected]>
---
src/kudu/tools/kudu-tool-test.cc | 2 +-
src/kudu/tools/tool_action_master.cc | 45 ++++++++++++++++++------------------
2 files changed, 24 insertions(+), 23 deletions(-)
diff --git a/src/kudu/tools/kudu-tool-test.cc b/src/kudu/tools/kudu-tool-test.cc
index f674a7089..421f0653e 100644
--- a/src/kudu/tools/kudu-tool-test.cc
+++ b/src/kudu/tools/kudu-tool-test.cc
@@ -1546,7 +1546,7 @@ TEST_F(ToolTest, TestModeHelp) {
"status.*Get the status",
"timestamp.*Get the current timestamp",
"list.*List masters in a Kudu cluster",
- "add.*Add a master to the Kudu cluster",
+ "add.*Add a new master to existing Kudu cluster",
"remove.*Remove a master from the Kudu cluster",
};
NO_FATALS(RunTestHelp(kCmd, kMasterModeRegexes));
diff --git a/src/kudu/tools/tool_action_master.cc
b/src/kudu/tools/tool_action_master.cc
index 0796d0f66..a23220b14 100644
--- a/src/kudu/tools/tool_action_master.cc
+++ b/src/kudu/tools/tool_action_master.cc
@@ -446,8 +446,8 @@ Status AddMaster(const RunnerContext& context) {
return Status::InvalidArgument("Flag -fs_data_dirs not supplied");
}
GFlagsMap flags_map = GetNonDefaultFlagsMap();
- // Remove the optional parameters for this command.
- // Remaining optional flags need to be passed to the new master.
+ // Remove all the tool-specific flags.
+ // Remaining flags are passed to the new master.
flags_map.erase("wait_secs");
flags_map.erase("kudu_abs_path");
@@ -868,31 +868,32 @@ unique_ptr<Mode> BuildMasterMode() {
{
unique_ptr<Action> add_master =
ActionBuilder("add", &AddMaster)
- .Description("Add a master to the Kudu cluster")
+ .Description("Add a new master to existing Kudu cluster")
.ExtraDescription(
- "This is an advanced command that orchestrates the workflow to
bring up and add a "
- "new master to the Kudu cluster. It must be run locally on the new
master being added "
- "and not on the leader master. This tool shuts down the new master
after completion "
- "of the command regardless of whether the new master addition is
successful. "
- "After the command completes successfully, user is expected to
explicitly "
- "start the new master using the same flags as supplied to this
tool.\n\n"
- "Supply all the necessary flags to bring up the new master. "
- "The most common configuration flags used to bring up a master are
described "
- "below. See \"Kudu Configuration Reference\" for all the
configuration options that "
- "apply to a Kudu master.\n\n"
- "Please refer to the Kudu administration documentation on "
- "\"Migrating to Multiple Kudu Masters\" for the complete steps.")
+ "NOTE: with kudu-master binaries of 1.16.0 and newer versions, "
+ "there is no need to run this tool to add a new Kudu master; "
+ "it's enough to start kudu-master process at a new Kudu master "
+ "node as usual, and it will automatically perform the necessary "
+ "steps while running for the very first time at the new node.\n\n"
+ "This is a tool to add a new master to the Kudu cluster. It must "
+ "be run on the node where the new Kudu master is being added, NOT "
+ "on any of the existing master nodes. In addition to the new "
+ "master's hostname and RPC addresses of existing masters, "
+ "--wait_secs and --kudu_abs_path are the only tool-specific flags,
"
+ "and the rest of the flags supplied are for the kudu-master "
+ "process. While this tool advertises only a minimalistic set of "
+ "master-specific flags below, it accepts all the flags that a "
+ "kudu-master process can start with. After the command completes "
+ "successfully, the new Kudu master should be started as usual "
+ "using the SAME MASTER-SPECIFIC FLAGS as supplied to this tool.")
.AddRequiredParameter({ kMasterAddressesArg, kMasterAddressesArgDesc })
.AddRequiredParameter({ kMasterAddressArg, kMasterAddressDesc })
.AddOptionalParameter("wait_secs")
.AddOptionalParameter("kudu_abs_path")
- .AddOptionalParameter("fs_wal_dir")
- .AddOptionalParameter("fs_data_dirs")
- .AddOptionalParameter("fs_metadata_dir")
- .AddOptionalParameter("log_dir")
- // Unlike most tools we don't log to stderr by default to match the
- // kudu-master binary as closely as possible.
- .AddOptionalParameter("logtostderr", string("false"))
+ .AddOptionalParameter("fs_wal_dir", "", "New master's WAL directory")
+ .AddOptionalParameter("fs_data_dirs", "", "New master's data
directories")
+ .AddOptionalParameter("fs_metadata_dir", "", "New master's metadata
directory")
+ .AddOptionalParameter("log_dir", "", "New master's log directory")
.Build();
builder.AddAction(std::move(add_master));
}
