NO_CONTACT：无法联系该节点。NO_CONTACT: The node cannot be contacted.

UNKNOWN：可以联系该节点，但其状态尚不清楚。通常，这意味着节点已收到来自管理服务器的START或RESTART命令，但尚未执行。UNKNOWN: The node can be contacted, but its status is not yet known. Usually, this means that the node has received a START or RESTART command from the management server, but has not yet acted on it.

NOT_STARTED：节点已停止，但仍与集群保持联系。当使用管理客户端的RESTART命令重新启动节点时会出现此情况。NOT_STARTED: The node has stopped, but remains in contact with the cluster. This is seen when restarting the node using the management client's RESTART command.

STARTING：节点的 ndbd 进程已启动，但节点尚未加入集群。STARTING: The node's ndbd process has started, but the node has not yet joined the cluster.

STARTED：节点已运行，并已加入集群。STARTED: The node is operational, and has joined the cluster.

SHUTTING_DOWN：节点正在关闭。SHUTTING_DOWN: The node is shutting down.

SINGLE USER MODE：当集群处于单用户模式时，所有集群数据节点都会显示此状态。SINGLE USER MODE: This is shown for all cluster data nodes when the cluster is in single user mode.

--character-sets-dir

包含字符集的目录。Directory containing character sets.

--connect-retries

放弃之前重试连接的次数。Number of times to retry connection before giving up.

--connect-retry-delay

尝试联系管理服务器之间等待的秒数。Number of seconds to wait between attempts to contact management server.

--connect-string

与 --ndb-connectstring 相同。Same as --ndb-connectstring.

--core-file

错误时生成核心文件；用于调试。Write core file on error; used in debugging.

--defaults-extra-file

在读取全局文件之后读取给定文件。Read given file after global files are read.

--defaults-file

仅从指定文件读取默认选项。Read default options from given file only.

--defaults-group-suffix

也读取组合了 concat(group, suffix) 的组。Also read groups with concat(group, suffix).

--login-path

从登录文件读取给定路径。Read given path from login file.

--no-login-paths

跳过从登录路径文件读取选项。Skips reading options from the login path file.

--help

显示帮助文本并退出。Display help text and exit.

--ndb-connectstring

设置用于连接到 ndb_mgmd 的连接字符串。语法：[nodeid=id;][host=]hostname[:port]。覆盖 NDB_CONNECTSTRING 和 my.cnf 中的条目。Set connection string for connecting to ndb_mgmd. Syntax: [nodeid=id;][host=]hostname[:port]. Overrides entries in NDB_CONNECTSTRING and my.cnf.

--ndb-mgm-tls

设置连接到管理服务器所需的 TLS 支持级别；可以是 relaxed 或 strict。relaxed（默认）表示尝试建立 TLS 连接，但不要求成功；strict表示连接必须使用 TLS。Sets the level of TLS support required to connect to the management server; one of relaxed or strict. relaxed (the default) means that a TLS connection is attempted, but success is not required; strict means that TLS is required to connect.

--ndb-mgmd-host

与 --ndb-connectstring 相同。Same as --ndb-connectstring.

--ndb-nodeid

为此节点设置节点 ID，覆盖由 --ndb-connectstring 设置的任何 ID。Set node ID for this node, overriding any ID set by --ndb-connectstring.

--ndb-optimized-node-selection

启用事务节点选择的优化。默认启用；使用 --skip-ndb-optimized-node-selection 来禁用。Enable optimizations for selection of nodes for transactions. Enabled by default; use --skip-ndb-optimized-node-selection to disable.

--ndb-tls-search-path

指定用于搜索 CA 文件的目录列表。在 Unix 平台上，目录名称用冒号 (:) 分隔；在 Windows 系统上，使用分号 (;) 作为分隔符。目录引用可以是相对路径或绝对路径；它可以包含一个或多个环境变量，每个变量以美元符号 ($) 开头，并在使用前进行展开。Specify a list of directories to search for a CA file. On Unix platforms, the directory names are separated by colons (:); on Windows systems, the semicolon character (;) is used as the separator. A directory reference may be relative or absolute; it may contain one or more environment variables, each denoted by a prefixed dollar sign ($), and expanded prior to use.

搜索从最左边的命名目录开始，按从左到右的顺序进行，直到找到文件。空字符串表示空搜索路径，这会导致所有搜索失败。由单个点 (.) 组成的字符串表示搜索路径仅限于当前工作目录。Searching begins with the leftmost named directory and proceeds from left to right until a file is found. An empty string denotes an empty search path, which causes all searches to fail. A string consisting of a single dot (.) indicates that the search path limited to the current working directory.

如果未提供搜索路径，则使用编译时的默认值。此值取决于所使用的平台：在 Windows 上，它是 \ndb-tls；在其他平台（包括 Linux）上，它是 $HOME/ndb-tls。可以通过使用 -DWITH_NDB_TLS_SEARCH_PATH 编译 NDB Cluster 来覆盖该值。If no search path is supplied, the compiled-in default value is used. This value depends on the platform used: On Windows, this is \ndb-tls; on other platforms (including Linux), it is $HOME/ndb-tls. This can be overridden by compiling NDB Cluster using -DWITH_NDB_TLS_SEARCH_PATH.

--no-contact, -n

与等待STARTED状态不同，ndb_waiter会继续运行，直到集群达到NO_CONTACT状态才退出。Instead of waiting for the STARTED state, ndb_waiter continues running until the cluster reaches NO_CONTACT status before exiting.

--no-defaults

除了登录文件之外，不从任何配置文件读取默认选项。Do not read default options from any option file other than login file.

--not-started

与其等待 STARTED 状态，ndb_waiter 会继续运行，直到集群达到 NOT_STARTED 状态才退出。Instead of waiting for the STARTED state, ndb_waiter continues running until the cluster reaches NOT_STARTED status before exiting.

--nowait-nodes=list

使用此选项时，ndb_waiter 不会等待列出的节点 ID。列表以逗号分隔；范围可以用短横表示，如下所示：When this option is used, ndb_waiter does not wait for the nodes whose IDs are listed. The list is comma-delimited; ranges can be indicated by dashes, as shown here:

$> ndb_waiter --nowait-nodes=1,3,7-9

--print-defaults

打印程序参数列表然后退出。Print program argument list and exit.

--timeout=seconds, -t seconds --timeout=seconds, -t seconds

等待时间。如果在此秒数内未达到所需状态，程序将退出。默认值为 120 秒（1200 个报告周期）。Time to wait. The program exits if the desired state is not achieved within this number of seconds. The default is 120 seconds (1200 reporting cycles).

--single-user

程序等待集群进入单用户模式。The program waits for the cluster to enter single user mode.

--usage

显示帮助文本并退出；功能与 --help 相同。Display help text and exit; same as --help.

--verbose

控制打印输出的详细程度。可能的级别及其效果如下所示：Controls verbosity level of printout. Possible levels and their effects are listed here:

ndb_waiter 返回的退出代码如下，并附有其含义：Exit codes returned by ndb_waiter are listed here, with their meanings:

--version

显示版本信息并退出。Display version information and exit.

--wait-nodes=list, -w list

使用此选项时，ndb_waiter只会等待列出 ID 的节点。列表以逗号分隔；可以用连字符表示范围，如下所示：When this option is used, ndb_waiter waits only for the nodes whose IDs are listed. The list is comma-delimited; ranges can be indicated by dashes, as shown here:

$> ndb_waiter --wait-nodes=2,4-6,10