ableData">T</a>&nbsp;acquireReadAndRelease()</pre>
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<h4>acquireRead</h4>
<pre class="methodSignature">public&nbsp;<a href="CacheableData.html" title="type parameter in CacheableData">T</a>&nbsp;acquireRead()</pre>
<div class="block">Acquires a shared "read-only" lock, produces the reference to the cache block,
 restores the cache block to main memory, reads from HDFS if needed.
 
 Synchronized because there might