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The "UnixShellScriptProgrammingGuide" page has been changed by SomeOtherAccount: https://wiki.apache.org/hadoop/UnixShellScriptProgrammingGuide?action=diff&rev1=18&rev2=19 In addition to all of the variables documented in `*-env.sh` and `hadoop-layout.sh`, there are a handful of special env vars: - * `JAVA_HEAP_MAX` - This is the Xmx parameter to be passed to Java. (e.g., `"-Xmx1g"`). This is present for backward compatibility, however it should be added to `HADOOP_OPTS` via `hadoop_add_param HADOOP_OPTS Xmx "${JAVA_HEAP_MAX}"` prior to calling `hadoop_finalize`. + * `HADOOP_HEAP_MAX` - This is the Xmx parameter to be passed to Java. (e.g., `"-Xmx1g"`). This is present for backward compatibility, however it should be added to `HADOOP_OPTS` via `hadoop_add_param HADOOP_OPTS Xmx "${JAVA_HEAP_MAX}"` prior to calling `hadoop_finalize`. * `HADOOP_DAEMON_MODE` - This will be set to `start` or `stop` based upon what `hadoop-config.sh` has determined from the command line options.
