[GitHub] dlg99 opened a new issue #1400: createLedger() may fail if called immediatly after bookie startup

[GitBox <gi...@apache.org>]

dlg99 opened a new issue #1400: createLedger() may fail if called immediatly after bookie startup
URL: https://github.com/apache/bookkeeper/issues/1400
 
 
   **BUG REPORT**
   
   [testLedgerCreateAfterBookieStartup.txt](https://github.com/apache/bookkeeper/files/1992491/testLedgerCreateAfterBookieStartup.txt)
   
   Caught this as a flapper in a separate (new) test suite.
   createLedger() may fail with "org.apache.bookkeeper.client.BKException$BKNotEnoughBookiesException: Not enough non-faulty bookies available" if executed immediately after bookie restart.
   
   It does not seem to be a production risk as the test uses single bookie and simple sleep(100ms) after bookie startup takes care of this problem.
   OTOH I tried this test on internal (older) branch and the test passes so clearly there is a regression somewhere. 
   
   Narrowed down it reproduces like this (also patch attached):
   
   ```java
       @Test
       public void testLedgerCreateAfterBookieStartup() throws Exception {
           // only one bookie started initially
   
           for (int n = 0; n < 30; n++) {
               int bkId = 0;
               BookieServer bks = bs.get(bkId);
               bks.shutdown();
               bks = new BookieServer(bsConfs.get(bkId));
               bks.start();
               bs.set(bkId, bks);
   
               // all passes with this sleep:
               //Thread.sleep(100);
   
               // Create ledgers
               LedgerHandle[] lhs = new LedgerHandle[10];
               for (int i = 0; i < 10; i++) {
                   LOG.info("Iteration {}, creating ledger", n);
                   lhs[i] = bkc.createLedger(1, 1, BookKeeper.DigestType.CRC32, "z".getBytes());
                   LOG.info("Iteration {}, created ledger ID: {}", n, lhs[i].getId());
                   lhs[i].addEntry("zzz".getBytes());
               }
           }
       }
   ```
   

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