What's the difference between ClientCache#removeAll() and ClientCache#clear()

[kcheng.mvp]

Here is the code snippet from 
org.apache.ignite.client.ClientCache

what's the difference between these two methods?

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    /**
     * Clears the contents of the cache.
     */
    public void clear() throws ClientException;



    /**
     * Removes all of the mappings from this cache.
     * <p>
     * The order that the individual entries are removed is undefined.
     */
    public void removeAll() throws ClientException;

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