T Jake Luciani created CASSANDRA-12080:
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Summary: More detailed compaction log
Key: CASSANDRA-12080
URL: https://issues.apache.org/jira/browse/CASSANDRA-12080
Project: Cassandra
Issue Type: Improvement
Reporter: T Jake Luciani
Assignee: T Jake Luciani
Priority: Trivial
Fix For: 3.8
As mentioned by [~zznate] at NGCC the compaction task info at the end of the
compaction log is pretty confusing.
Mainly we only show the throughput of the sstable writer. But if there is a
lot of merging being done it might look like compaction is really really slow
since the output might be small but the inputs were huge.
Also bytes/sec isn't a great metric of *work* really we should be reporting the
CQL row throughput. since for the same bytes on disk we might be compacting
100k rows or 1 large one.
I've added a trivial patch that improves the logging info to now show Read
Throughput, Write Throughput, Rows sec and total source partitions.
{quote}
DEBUG [CompactionExecutor:1] 2016-06-23 12:22:06,114 CompactionTask.java:229 -
Compacted (9edcfa50-395e-11e6-9944-3109153b1592) 2 sstables to
[/home/jake/workspace/cassandra/data/data/stresscql/userpics-b9d2811038b711e69c04018b580faf7b/mb-11-big,]
to level=0. 13.159MiB to 6.590MiB (~50% of original) in 2,474ms. Read
Throughput = 5.317MiB/s, Write Throughput = 2.663MiB/s, Row Throughput =
~166,666/s. 500,000 total partitions merged to 250,000. Partition merge
counts were {2:250000, }
{quote}
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