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Yuki Morishita, of the Datastax blog, recently published an article about updates to Cassandra's use of the Yammer Metric library. Here's a slice of the introduction and a link to the original post:
Apache Cassandra exposes various kind of internal metrics from client
read/write request latencies to ColumnFamily’s Bloom filter false
positive ratio through JMX. From version 1.1, Cassandra started using Yammer’s Metrics library
to track new client request metrics. Cassandra 1.2 expands use of the
library to other metrics that are already available and put them
org.apache.cassandra.metrics JMX domain. For
backward compatibility, metrics are still available through the same JMX
location as before (in fact, nodetool is still using old interface),
but those implementations are (almost) replaced by new metrics.
METRICS IN APACHE CASSANDRA 1.2
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