[HADOOP-14481] Print stack trace when native bzip2 library does not load

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Component/s: io
• Assignee: Wei-Chiu Chuang
• Reporter: Wei-Chiu Chuang
• Created: 02/Jun/17 17:04
• Updated: 02/Oct/19 17:13

Description

When I ran hadoop checknative on my machine, it was not able to load system bzip2 library and printed the following message.

17/06/02 09:25:42 WARN bzip2.Bzip2Factory: Failed to load/initialize native-bzip2 library system-native, will use pure-Java version

Reviewing the relevant code, it fails because of an exception. However, that exception is not logged. We should print the stacktrace, at least at debug log level.

Bzip2Factory#isNativeBzip2Loaded()

try {
          // Initialize the native library.
          Bzip2Compressor.initSymbols(libname);
          Bzip2Decompressor.initSymbols(libname);
          nativeBzip2Loaded = true;
          LOG.info("Successfully loaded & initialized native-bzip2 library " +
                   libname);
        } catch (Throwable t) {
          LOG.warn("Failed to load/initialize native-bzip2 library " + 
                   libname + ", will use pure-Java version");
        }