Daryn Sharp created HADOOP-15743:
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Summary: Jetty and SSL tunings to stabilize KMS performance
Key: HADOOP-15743
URL: https://issues.apache.org/jira/browse/HADOOP-15743
Project: Hadoop Common
Issue Type: Bug
Components: kms
Affects Versions: 2.8.0
Reporter: Daryn Sharp
The KMS has very low throughput with high client failure rates. The following
config options will "stabilize" the KMS under load:
# Disable ECDH algos because java's SSL engine is inexplicably HORRIBLE.
# Reduce SSL session cache size (unlimited) and ttl (24h). The memory cache
has very poor performance and causes extreme GC collection pressure. Load
balancing diminishes the effectiveness of the cache to 1/N-hosts anyway.
** -Djavax.net.ssl.sessionCacheSize=1000
** -Djavax.net.ssl.sessionCacheTimeout=6
# Completely disable thread LowResourceMonitor to stop jetty from immediately
closing incoming connections during connection bursts. Client retries cause
jetty to remain in a low resource state until many clients fail and cause
thousands of sockets to linger in various close related states.
# Set min/max threads to 4x processors. Jetty recommends only 50 to 500
threads. Java's SSL engine has excessive synchronization that limits
performance anyway.
# Set https idle timeout to 6s.
# Significantly increase max fds to at least 128k. Recommend using a VIP load
balancer with a lower limit.
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