Fix the topics parse issue when very long topics are given.

fujuntang

2021-08-31 511496a608be4ce2c0189ab0021d05ef2434da89

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ipcrm -a
rm *.txt
./test_lostdata
sort -n c.txt  > c1.txt
sort -n p.txt  > p1.txt
diff -u p1.txt c1.txt