from the name-node logs we see the following messages about the Detected pause in JVM
INFO util.JvmPauseMonitor (JvmPauseMonitor.java run(196)) - Detected pause in JVM or host machine (eg GC) pause of approximately 2127ms
INFO util.JvmPauseMonitor (JvmPauseMonitor.java run(196)) - Detected pause in JVM or host machine (eg GC) pause of approximately 1220ms
INFO util.JvmPauseMonitor (JvmPauseMonitor.java run(196)) - Detected pause in JVM or host machine (eg GC) pause of approximately 1244ms
Detected pause in JVM are due insufficient heap memory. and its a sign to increase the name-node heap size
but this messages are in INFO and not in WARNING
from the log the pause is on range 2127ms - 8730ms
based on the logs above is it recommended to increase the name-node heap size in spite the messages are in INFO?
we also check the FGCT/GCT ( from jstat -gcutil ) values and they are:
FGC = 0
FGCT = 0.000
GCT = 2640.700