Shulou(Shulou.com)06/03 Report--

[vm.swappiness]

Set to 0, indicating that the kernel does not exchange application data to disk.

If the disk is performing other Iramo operations, exchanging data from the Hadoop daemon to disk may cause the operation to time out and may fail. For HBase, because the Server of HBase must keep communicating with ZooKeeper, otherwise they will be marked as failed.

[vm.overcommit_memory]

When considering java subtask bifurcation, the memory occupied immediately before exec will use twice as much memory. Set the value of vm.overcommit_memory to 1 and adjust the vm.overcommit_ratio parameter accordingly.

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