Namenode not starting: Detected pause in JVM or host machine (eg GC)

Error in detail:
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=4853ms
2018-07-19 10:35:34,324 INFO  util.JvmPauseMonitor (JvmPauseMonitor.java:run(196)) - Detected pause in JVM or host machine (eg GC): pause of approximately 3645ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=2 time=9594ms
2018-07-19 10:35:39,303 INFO  util.JvmPauseMonitor (JvmPauseMonitor.java:run(196)) - Detected pause in JVM or host machine (eg GC): pause of approximately 4477ms
In Ambari GUI showing following error:
IndexError: list index out of range
Increase the namenode java heap size to fix this issue
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