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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-19657

logrt[] can skip records under rare conditions

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Details

    • Problem report
    • Status: Open
    • Trivial
    • Resolution: Unresolved
    • 4.0.33rc1
    • None
    • Agent (G)
    • None
    • GNU/Linux
    • Team C

    Description

      When logrt[] analyzes a log file which ends with a large record (over 256 kB) without newline at the end then the record is reported to server (if it matches the regexp).
      If there is a newer log file then logrt[] proceeds with analyzing it and skips the first record (this is incorrect).

      Steps to reproduce:
      1) Create the older log file with a large record without newline at the end, e,g.

      $ perl -le 'print "a"x300000' | dd bs=1 count=299999 > test.log299999
      

      2) Create the newer log file, e,g.

      $ echo test1 > test.log
      $ echo test2 >> test.log
      

      Now there are 2 test files, with timestamps, e.g.

      $ ls -ltr test*                                                         
      -rw-r--r-- 1 zabbix zabbix 299999 jul  8 17:55 test.log299999
      -rw-r--r-- 1 zabbix zabbix     12 jul  8 17:56 test.log
      

      Create a new test item like

              logrt[/home/zabbix/^test.log]
      

      Observe in "Monitoring->Latest data" that record "test1" is missing:

      2021-07-08 17:58:47 1625756327 "test2"
      2021-07-08 17:58:47 1625756327 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
      .....
      

      The record should be:
        - large,
        - the last record in the file,
        - without newline at the end
      for this error to happen.

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            andris Andris Mednis
            andris Andris Mednis
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            Dates

              Created:
              Updated: