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Script to check that both NameNodes are alive in HDFS HA configuration and will force failover to the preferred NameNode
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| #!/bin/bash | |
| # | |
| # This script will check that both NameNodes are alive in HDFS HA | |
| # configuration and will force failover to the preferred NameNode. | |
| # | |
| # Author: Stas Alekseev <me@salekseev.com> | |
| # | |
| ACTIVE_NAMENODE=nn1 | |
| STANDBY_NAMENODE=nn2 | |
| if [ ${USER} != "hdfs" ]; then | |
| echo "This script must be run as hdfs user." | |
| exit 1 | |
| fi | |
| # Check that both NameNodes are alive | |
| hdfs haadmin -checkHealth ${ACTIVE_NAMENODE} && hdfs haadmin -checkHealth ${STANDBY_NAMENODE} || { | |
| printf '%s\n' 'ERROR: one of the namenodes is dead' | |
| exit 1 | |
| } | |
| if [ $(hdfs haadmin -getServiceState ${ACTIVE_NAMENODE}) = "standby" ] | |
| then | |
| hdfs haadmin -failover ${STANDBY_NAMENODE} ${ACTIVE_NAMENODE} | |
| fi |
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