huxinqiu opened a new pull request, #4714:
URL: https://github.com/apache/hadoop/pull/4714
### Description of PR
The current implementation reset src and tgt to the mark and continues
searching when tgt has remaining and src expired first. which is probably not
necessary.
For example, when q is searched, it is found that src has no remaining, and
src is reset to d to continue searching. But the remaining length of src is
always smaller than tgt, at this point we can return -1 directly.
`@Test
public void testFind() throws Exception {
Text text = new Text("abcd\u20acbdcd\u20ac");
assertThat(text.find("cd\u20acq")).isEqualTo(-1);
} `
### How was this patch tested?
unit test in org.apache.hadoop.io.TestText#testFind
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