/jira/browse/FLINK-17970'>FLINK-17970</a>] -         Increase default value of IO pool executor to 4 * #cores
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-18010'>FLINK-18010</a>] -         Add more logging to HistoryServer
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-18501'>FLINK-18501</a>] -         Mapping of Pluggable Filesystems to scheme is not properly logged
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-18644'>FLINK-18644</a>] -         Remove o