我的内部服务有一个19节点的Cassandra集群。如果我使用nodetool登录节点并运行tablestats等命令，那么是否只为该特定节点或整个集群收集统计信息？
答案 0 :(得分：1)
如果-h，大多数nodetool命令在集群中的单个节点上运行 不用于标识一个或多个其他节点。如果节点来自 您发出命令的是预期目标，您不需要 -h选项用于标识目标;否则，对于远程 使用-h。
调用，识别目标节点或节点
答案 1 :(得分：1)
<html>
<body>
<p>Click the button to wait 3 seconds, then alert "Hello".</p>
<input type="text" id="myText" value="A text field">
<br><br><br>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
setTimeout(function(){
document.getElementById("myText").focus();
}, 3000);
}
</script>
</body>
</html>
实用程序为整个集群收集，而不是单个节点。
例如，如果您运行类似 -
命令：
connect(view, SIGNAL(focus(bool)),SLOT(popupKeyboardOnAutoFocus(bool)));
结果：
nodetool表格nodetool tablestats musicdb.artist
属于上面的密钥空间Keyspace: musicdb
Read Count: 0
Read Latency: NaN ms.
Write Count: 0
Write Latency: NaN ms.
Pending Flushes: 0
Table: artist
SSTable count: 1
Space used (live): 62073
Space used (total): 62073
Space used by snapshots (total): 0
Off heap memory used (total): 1400
SSTable Compression Ratio: 0.27975344141453456
Number of keys (estimate): 1000
Memtable cell count: 0
Memtable data size: 0
Memtable off heap memory used: 0
Memtable switch count: 0
Local read count: 0
Local read latency: NaN ms
Local write count: 0
Local write latency: NaN ms
Pending flushes: 0
Bloom filter false positives: 0
Bloom filter false ratio: 0.00000
Bloom filter space used: 1264
Bloom filter off heap memory used: 1256
Index summary off heap memory used: 128
Compression metadata off heap memory used: 16
Compacted partition minimum bytes: 104
Compacted partition maximum bytes: 149
Compacted partition mean bytes: 149
Average live cells per slice (last five minutes): 0.0
Maximum live cells per slice (last five minutes): 0
Average tombstones per slice (last five minutes): 0.0
Maximum tombstones per slice (last five minutes): 0
的状态来自整个群集。