Database Reference
In-Depth Information
Pending flushes: 0
Bloom filter false positives: 0
Bloom filter false ratio: 0.00000
Bloom filter space used, bytes: 296864
Compacted partition minimum bytes: 373
Compacted partition maximum bytes: 3379391
Compacted partition mean bytes: 12046
Average live cells per slice (last five minutes): 0.0
Average tombstones per slice (last five minutes): 0.0
A few important statistics are as follows:
Read Latency and Write Latency : These provide the average time elapsed in
performing these operations. Look at these if you see that the throughput is slow.
Read Count and Write Count : These can provide a general idea of how fre-
quently a table is accessed. It may be an indicator of how busy a table is.
Pending Tasks : Lots of pending tasks are an indication of an overloaded node.
Maybe you should look into adding more machines or improving the node's hard-
ware.
Space Used (live and total) : The live statistic represents the space used by the
SSTables in use. The total statistic is the total space used by the SSTable. The
total statistic is always greater than or equal to the live statistic owing to the exist-
ence of deleted, but yet-to-be-removed, data. All these data are in bytes (just
bytes, not kilobytes or megabytes).
netstats
The netstats command is used to view the network statistics (streaming information)
of the node within the ring. This is a very useful tool, especially during maintenance
work, such as moving, repairing, removing the node ( decommission ), or starting up a
new one.
The following commands show various stages of the node as provided by netstats
while a node is being added:
$ bin/nodetool -h cassandra01.naishe.in netstats
Mode: JOINING
Bootstrap 3cb55a90-7798-11e4-8b2e-d74579598740
/10.10.21.228
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