Package org.apache.hadoop.hbase.io.asyncfs
package org.apache.hadoop.hbase.io.asyncfs
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ClassesClassDescriptionTestcase for HBASE-26679, here we introduce a separate test class and not put the testcase in
TestFanOutOneBlockAsyncDFSOutputbecause we will send heartbeat to DN when there is no out going packet, the timeout is controlled byTestFanOutOneBlockAsyncDFSOutput.READ_TIMEOUT_MS,which is 2 seconds, it will keep sending package out and DN will respond immedately and then mess up the testing handler added by us.Used to confirm that it is OK to overwrite a file which is being written currently.