Abnormal of CPU usage of some nodes

CPU usage on some nodes looks abnormal,

.
Other nodes looks normal,
.
Shards and documents are evenly distributed on each node.
What is the reason for this?

can you explain what you mean with abnormal here? It seems the load is still pretty low during the day and in total does not rise above 25% - nothing I would be worried about.

You can use the hot threads API to see what code path is using the most CPU in case it happens, that should give a first a indication.

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can you explain what you mean with abnormal here?

The CPU utilization curve is jagged.

It seems the load is still pretty low during the day and in total does not rise above 25% - nothing I would be worried about.

I just think the CPU utilization curve in figure 1 is strange compared to figure 2, although the ES cluster is indeed normal.

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