Chen Zhang created HDFS-14652:
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Summary: HealthMonitor connection retry times should be
configurable
Key: HDFS-14652
URL: https://issues.apache.org/jira/browse/HDFS-14652
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Chen Zhang
On our production HDFS cluster, some client's burst requests cause the tcp
kernel queue full on NameNode's host, since the configuration value of
"net.ipv4.tcp_syn_retries" in our environment is 1, so after 3 seconds, the
ZooKeeper Healthmonitor got an connection error like this:
{code:java}
WARN org.apache.hadoop.ha.HealthMonitor: Transport-level exception trying to
monitor health of NameNode at nn_host_name/ip_address:port: Call From
zkfc_host_name/ip to nn_host_name:port failed on connection exception:
java.net.ConnectException: Connection timed out; For more details see:
http://wiki.apache.org/hadoop/ConnectionRefused
{code}
This error caused a failover and affects the availability of that cluster, we
fixed this issue by enlarge the kernel parameter net.ipv4.tcp_syn_retries to 6
But during working on this issue, we found that the connection retry
time(ipc.client.connect.max.retries) of health-monitor is hard coded as 1, I
think it should be configurable, then if we don't want the health-monitor so
sensitive, we can change it's behavior by change this configuration
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