="block">Redirects the default java serialization via externalizable to our default
 hadoop writable serialization for efficient broadcast/rdd serialization.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Externalizable.html?is-external=true#writeExternal(java.io.ObjectOutput)" title="class or interface in java.io" class="externalLink">writeExternal</a></code>&nbsp;in interface&nbsp;<code><a 