[jira] [Created] (CASSANDRA-6656) Exception logging

["Ding Yuan (JIRA)" <ji...@apache.org>]

Ding Yuan created CASSANDRA-6656:
------------------------------------

             Summary: Exception logging
                 Key: CASSANDRA-6656
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6656
             Project: Cassandra
          Issue Type: Improvement
          Components: Core, Tools
            Reporter: Ding Yuan
             Fix For: 2.0.4


Reporting a few cases where informative exceptions can be silently swallowed. Attaching a proposed patch. 

=========================
Case 1
  Line: 95, File: "org/apache/cassandra/utils/Hex.java"

An actual failure in the underlying constructor will be lost.
Propose to log it.

            try
            {
                s = stringConstructor.newInstance(0, c.length, c);
+           }
+           catch (InvocationTargetException ite) {
+               // The underlying constructor failed. Unwrapping the exception.
+               logger.info("Underlying constructor throws exception: ", ite.getCause());
            }
            catch (Exception e)
            {
                // Swallowing as we'll just use a copying constructor
            }
        return s == null ? new String(c) : s;
==========================================
=========================
Case 2
  Line: 192, File: "org/apache/cassandra/db/marshal/DynamicCompositeType.java"

The actual cause of comparator error can be lost as it can fail in multiple locations.

        AbstractType<?> comparator = null;
        int header = getShortLength(bb);
        if ((header & 0x8000) == 0)
        {
            ByteBuffer value = getBytes(bb, header);
            try
            {
                comparator = TypeParser.parse(ByteBufferUtil.string(value));
            }
            catch (Exception e)
            {
                <--- can fail here
                // we'll deal with this below since comparator == null
            }
        }
        else
        {
            comparator = aliases.get((byte)(header & 0xFF));
                <--- can fail here
        }
        if (comparator == null)
            throw new MarshalException("Cannot find comparator for component " + i);

Propose to log the exception.
==========================================
=========================
Case 3
  Line: 239, File: "org/apache/cassandra/tools/NodeProbe.java"
Exception ignored in finally. Propose log them with debug or trace.

232:         finally
233:         {
234:             try
235:             {
236:                 ssProxy.removeNotificationListener(runner);
236:                 ssProxy.removeNotificationListener(runner);
237:                 jmxc.removeConnectionNotificationListener(runner);
238:             }
239:             catch (Throwable ignored) {}
240:         }

Similar case is at line 264 in the same file.
==========================================



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