[jira] [Created] (RATIS-471) `LogReader#readNext()` should return null or throw an error when reading off the end of the Log

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created RATIS-471:
--------------------------------

             Summary: `LogReader#readNext()` should return null or throw an error when reading off the end of the Log
                 Key: RATIS-471
                 URL: https://issues.apache.org/jira/browse/RATIS-471
             Project: Ratis
          Issue Type: Bug
          Components: LogService
            Reporter: Josh Elser


{code:java}
    @Test
    public void testReadOffEndOfLog() throws Exception {
      try (LogServiceClient client = new LogServiceClient(cluster.getMetaIdentity())) {
        LogStream stream = client.createLog(LogName.of("testReadWrite"));
        LogWriter writer = stream.createWriter();
        String message = "Hello world!";
        ByteBuffer testMessage =  ByteBuffer.wrap(message.getBytes());
        writer.write(testMessage);
        LogReader reader = stream.createReader();
        ByteBuffer res = reader.readNext();
        assertEquals(message, ByteBufferUtils.toStringUtf8(res));
        // readNext() should return `null` when there is no remaining record
        res = reader.readNext();
        assertNull(res);
      }
    }
{code}

The above test test should either pass (or throw an exception on the second {{readNext()}} call), but hangs indefinitely. We should be able to catch this.

FYI [~vrodionov], [~rajeshbabu]



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