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scripts: add support for parsing ZooKeeper transaction logs
Motivation: dCache is now strongly dependent on ZooKeeper functioning correctly. We have started receiving reports that indicate internal failures within ZK. Therefore, the ability to diagnose ZK problems is now important. Modification: Add a 'dcache' command that parses the ZooKeeper transaction logs. By default, it targets the directory that the embedded ZK server uses, but the command can target other directories. Result: The 'dcache' script can now parse ZooKeeper transaction logs as an aid to diagnosing potential problems. Require-notes: yes Require-book: no Target: master Request: 4.1 Request: 4.0 Request: 3.2 Request: 3.1 Request: 3.0 Request: 2.16 Ticket: http://rt.dcache.org/Ticket/Display.html?id=9332 Patch: https://rb.dcache.org/r/10913/ Acked-by: Tigran Mkrtchyan
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