[jira] [Created] (CASSANDRA-12080) More detailed compaction log

["T Jake Luciani (JIRA)" <ji...@apache.org>]

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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