Hello! We are using HA Hadoop (v2.5.1) Cluster with 3 DataNodes on Windows Server 2008R2 with 24 GB RAM. Sometimes we observe long GC times, e.g.:
1029537.175: [GC (Allocation Failure) 1029537.176: [ParNew: 5459023K->309990K(5662336K), 32.6609790 secs] 10328788K->5583905K(11953792K), 32.6611705 secs] [Times: user=0.92 sys=0.06, real=32.65 secs] Parameters: set GC_OPTS=-XX:+UseNUMA -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:ConcGCThreads=4 -XX:ParallelGCThreads=15 -Xmx12G -Xms12G -Xmn6G java version "1.8.0_25" Java(TM) SE Runtime Environment (build 1.8.0_25-b18) Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode) Could you please give some advice, how to troubleshoot this issue? Best regards, Dmitrii Simonov.
