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add warning to multithreaded_compaction

This commit is contained in:
Jonathan Ellis 2012-12-11 12:37:47 -06:00
parent 36b183f804
commit ca02176fc0
1 changed files with 9 additions and 6 deletions
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15
conf/cassandra.yaml
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@ -381,12 +381,15 @@ in_memory_compaction_limit_in_mb: 64
# Uncomment to make compaction mono-threaded, the pre-0.8 default.
#concurrent_compactors: 1
# Multi-threaded compaction. When enabled, each compaction will use
# up to one thread per core, plus one thread per sstable being merged.
# This is usually only useful for SSD-based hardware: otherwise,
# your concern is usually to get compaction to do LESS i/o (see:
# compaction_throughput_mb_per_sec), not more.
multithreaded_compaction: false
# multithreaded_compaction: false. When enabled, each compaction will
# use up to one thread per core, plus one thread per sstable being
# merged. This is usually only useful for SSD-based hardware:
# otherwise, your concern is usually to get compaction to do LESS i/o
# (see: compaction_throughput_mb_per_sec), not more.
#
# WARNING: this setting has caused compaction deadlocks for multiple
# users (see CASSANDRA-4492). It is recommended to leave this off
# unless you are prepared to help troubleshoot.
# Throttles compaction to the given total throughput across the entire
# system. The faster you insert data, the faster you need to compact in