http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6674e3ab/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.ObserverOperationWithoutResult.html
----------------------------------------------------------------------
diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.ObserverOperationWithoutResult.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.ObserverOperationWithoutResult.html
index 77fb9b5..c4e8c8b 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.ObserverOperationWithoutResult.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.ObserverOperationWithoutResult.html
@@ -165,520 +165,519 @@
 <span class="sourceLineNo">157</span>        E env = 
checkAndLoadInstance(implClass, priority, conf);<a name="line.157"></a>
 <span class="sourceLineNo">158</span>        if (env != null) {<a 
name="line.158"></a>
 <span class="sourceLineNo">159</span>          
this.coprocEnvironments.add(env);<a name="line.159"></a>
-<span class="sourceLineNo">160</span>          LOG.info(<a name="line.160"></a>
-<span class="sourceLineNo">161</span>              "System coprocessor " + 
className + " was loaded " + "successfully with priority (" + priority + 
").");<a name="line.161"></a>
-<span class="sourceLineNo">162</span>          ++priority;<a 
name="line.162"></a>
-<span class="sourceLineNo">163</span>        }<a name="line.163"></a>
-<span class="sourceLineNo">164</span>      } catch (Throwable t) {<a 
name="line.164"></a>
-<span class="sourceLineNo">165</span>        // We always abort if system 
coprocessors cannot be loaded<a name="line.165"></a>
-<span class="sourceLineNo">166</span>        abortServer(className, t);<a 
name="line.166"></a>
-<span class="sourceLineNo">167</span>      }<a name="line.167"></a>
-<span class="sourceLineNo">168</span>    }<a name="line.168"></a>
-<span class="sourceLineNo">169</span>  }<a name="line.169"></a>
-<span class="sourceLineNo">170</span><a name="line.170"></a>
-<span class="sourceLineNo">171</span>  /**<a name="line.171"></a>
-<span class="sourceLineNo">172</span>   * Load a coprocessor implementation 
into the host<a name="line.172"></a>
-<span class="sourceLineNo">173</span>   * @param path path to implementation 
jar<a name="line.173"></a>
-<span class="sourceLineNo">174</span>   * @param className the main class 
name<a name="line.174"></a>
-<span class="sourceLineNo">175</span>   * @param priority chaining priority<a 
name="line.175"></a>
-<span class="sourceLineNo">176</span>   * @param conf configuration for 
coprocessor<a name="line.176"></a>
-<span class="sourceLineNo">177</span>   * @throws java.io.IOException 
Exception<a name="line.177"></a>
-<span class="sourceLineNo">178</span>   */<a name="line.178"></a>
-<span class="sourceLineNo">179</span>  public E load(Path path, String 
className, int priority,<a name="line.179"></a>
-<span class="sourceLineNo">180</span>      Configuration conf) throws 
IOException {<a name="line.180"></a>
-<span class="sourceLineNo">181</span>    String[] includedClassPrefixes = 
null;<a name="line.181"></a>
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(conf.get(HConstants.CP_HTD_ATTR_INCLUSION_KEY) != null){<a name="line.182"></a>
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conf.get(HConstants.CP_HTD_ATTR_INCLUSION_KEY);<a name="line.183"></a>
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prefixes.split(";");<a name="line.184"></a>
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-<span class="sourceLineNo">186</span>    return load(path, className, 
priority, conf, includedClassPrefixes);<a name="line.186"></a>
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-<span class="sourceLineNo">188</span><a name="line.188"></a>
-<span class="sourceLineNo">189</span>  /**<a name="line.189"></a>
-<span class="sourceLineNo">190</span>   * Load a coprocessor implementation 
into the host<a name="line.190"></a>
-<span class="sourceLineNo">191</span>   * @param path path to implementation 
jar<a name="line.191"></a>
-<span class="sourceLineNo">192</span>   * @param className the main class 
name<a name="line.192"></a>
-<span class="sourceLineNo">193</span>   * @param priority chaining priority<a 
name="line.193"></a>
-<span class="sourceLineNo">194</span>   * @param conf configuration for 
coprocessor<a name="line.194"></a>
-<span class="sourceLineNo">195</span>   * @param includedClassPrefixes class 
name prefixes to include<a name="line.195"></a>
-<span class="sourceLineNo">196</span>   * @throws java.io.IOException 
Exception<a name="line.196"></a>
-<span class="sourceLineNo">197</span>   */<a name="line.197"></a>
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className, int priority,<a name="line.198"></a>
-<span class="sourceLineNo">199</span>      Configuration conf, String[] 
includedClassPrefixes) throws IOException {<a name="line.199"></a>
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name="line.200"></a>
-<span class="sourceLineNo">201</span>    LOG.debug("Loading coprocessor class 
" + className + " with path " +<a name="line.201"></a>
-<span class="sourceLineNo">202</span>        path + " and priority " + 
priority);<a name="line.202"></a>
-<span class="sourceLineNo">203</span><a name="line.203"></a>
-<span class="sourceLineNo">204</span>    ClassLoader cl = null;<a 
name="line.204"></a>
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name="line.205"></a>
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getClass().getClassLoader().loadClass(className);<a name="line.207"></a>
-<span class="sourceLineNo">208</span>      } catch (ClassNotFoundException e) 
{<a name="line.208"></a>
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path specified for " + className);<a name="line.209"></a>
-<span class="sourceLineNo">210</span>      }<a name="line.210"></a>
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CoprocessorClassLoader.getClassLoader(<a name="line.212"></a>
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getClass().getClassLoader(), pathPrefix, conf);<a name="line.213"></a>
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((CoprocessorClassLoader)cl).loadClass(className, includedClassPrefixes);<a 
name="line.215"></a>
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{<a name="line.216"></a>
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load external coprocessor class " + className, e);<a name="line.217"></a>
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-<span class="sourceLineNo">219</span>    }<a name="line.219"></a>
-<span class="sourceLineNo">220</span><a name="line.220"></a>
-<span class="sourceLineNo">221</span>    //load custom code for coprocessor<a 
name="line.221"></a>
-<span class="sourceLineNo">222</span>    Thread currentThread = 
Thread.currentThread();<a name="line.222"></a>
-<span class="sourceLineNo">223</span>    ClassLoader hostClassLoader = 
currentThread.getContextClassLoader();<a name="line.223"></a>
-<span class="sourceLineNo">224</span>    try{<a name="line.224"></a>
-<span class="sourceLineNo">225</span>      // switch temporarily to the thread 
classloader for custom CP<a name="line.225"></a>
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currentThread.setContextClassLoader(cl);<a name="line.226"></a>
-<span class="sourceLineNo">227</span>      E cpInstance = 
checkAndLoadInstance(implClass, priority, conf);<a name="line.227"></a>
-<span class="sourceLineNo">228</span>      return cpInstance;<a 
name="line.228"></a>
-<span class="sourceLineNo">229</span>    } finally {<a name="line.229"></a>
-<span class="sourceLineNo">230</span>      // restore the fresh (host) 
classloader<a name="line.230"></a>
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currentThread.setContextClassLoader(hostClassLoader);<a name="line.231"></a>
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-<span class="sourceLineNo">233</span>  }<a name="line.233"></a>
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-<span class="sourceLineNo">235</span>  @VisibleForTesting<a 
name="line.235"></a>
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C&gt; implClass, int priority, Configuration conf)<a name="line.236"></a>
-<span class="sourceLineNo">237</span>      throws IOException {<a 
name="line.237"></a>
-<span class="sourceLineNo">238</span>    E env = 
checkAndLoadInstance(implClass, priority, conf);<a name="line.238"></a>
-<span class="sourceLineNo">239</span>    coprocEnvironments.add(env);<a 
name="line.239"></a>
-<span class="sourceLineNo">240</span>  }<a name="line.240"></a>
-<span class="sourceLineNo">241</span><a name="line.241"></a>
-<span class="sourceLineNo">242</span>  /**<a name="line.242"></a>
-<span class="sourceLineNo">243</span>   * @param implClass Implementation 
class<a name="line.243"></a>
-<span class="sourceLineNo">244</span>   * @param priority priority<a 
name="line.244"></a>
-<span class="sourceLineNo">245</span>   * @param conf configuration<a 
name="line.245"></a>
-<span class="sourceLineNo">246</span>   * @throws java.io.IOException 
Exception<a name="line.246"></a>
-<span class="sourceLineNo">247</span>   */<a name="line.247"></a>
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checkAndLoadInstance(Class&lt;?&gt; implClass, int priority, Configuration 
conf)<a name="line.248"></a>
-<span class="sourceLineNo">249</span>      throws IOException {<a 
name="line.249"></a>
-<span class="sourceLineNo">250</span>    // create the instance<a 
name="line.250"></a>
-<span class="sourceLineNo">251</span>    C impl;<a name="line.251"></a>
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checkAndGetInstance(implClass);<a name="line.253"></a>
-<span class="sourceLineNo">254</span>      if (impl == null) {<a 
name="line.254"></a>
-<span class="sourceLineNo">255</span>        LOG.error("Cannot load 
coprocessor " + implClass.getSimpleName());<a name="line.255"></a>
-<span class="sourceLineNo">256</span>        return null;<a 
name="line.256"></a>
-<span class="sourceLineNo">257</span>      }<a name="line.257"></a>
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(InstantiationException|IllegalAccessException e) {<a name="line.258"></a>
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name="line.259"></a>
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name="line.261"></a>
-<span class="sourceLineNo">262</span>    E env = createEnvironment(impl, 
priority, loadSequence.incrementAndGet(), conf);<a name="line.262"></a>
-<span class="sourceLineNo">263</span>    assert env instanceof 
BaseEnvironment;<a name="line.263"></a>
-<span class="sourceLineNo">264</span>    ((BaseEnvironment&lt;C&gt;) 
env).startup();<a name="line.264"></a>
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loaded coprocessors for later crash analysis<a name="line.265"></a>
-<span class="sourceLineNo">266</span>    // if server (master or regionserver) 
aborts.<a name="line.266"></a>
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coprocessorNames.add(implClass.getName());<a name="line.267"></a>
-<span class="sourceLineNo">268</span>    return env;<a name="line.268"></a>
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-<span class="sourceLineNo">271</span>  /**<a name="line.271"></a>
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is loaded<a name="line.272"></a>
-<span class="sourceLineNo">273</span>   */<a name="line.273"></a>
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instance, int priority, int sequence, Configuration conf);<a 
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needs to be loaded. Checks if type of the given class<a name="line.277"></a>
-<span class="sourceLineNo">278</span>   * is what the corresponding host 
implementation expects. If it is of correct type, returns an<a 
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loaded. If not, returns null.<a name="line.279"></a>
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to create instance of a coprocessor, it's passed up and<a name="line.280"></a>
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aborting.<a name="line.281"></a>
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checkAndGetInstance(Class&lt;?&gt; implClass)<a name="line.283"></a>
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IllegalAccessException;<a name="line.284"></a>
-<span class="sourceLineNo">285</span><a name="line.285"></a>
-<span class="sourceLineNo">286</span>  public void shutdown(E e) {<a 
name="line.286"></a>
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BaseEnvironment;<a name="line.287"></a>
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name="line.288"></a>
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e.getInstance().getClass().getName());<a name="line.289"></a>
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-<span class="sourceLineNo">291</span>    ((BaseEnvironment&lt;C&gt;) 
e).shutdown();<a name="line.291"></a>
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or simple name.<a name="line.295"></a>
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(env.getInstance().getClass().getName().equals(className) ||<a 
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env.getInstance().getClass().getSimpleName().equals(className)) {<a 
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findCoprocessor(Class&lt;T&gt; cls) {<a name="line.308"></a>
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env.getInstance().getClass().getSimpleName().equals(className)) {<a 
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externalClassLoaders = new HashSet&lt;&gt;();<a name="line.359"></a>
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+<span class="sourceLineNo">219</span><a name="line.219"></a>
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currentThread.getContextClassLoader();<a name="line.222"></a>
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currentThread.setContextClassLoader(cl);<a name="line.225"></a>
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currentThread.setContextClassLoader(hostClassLoader);<a name="line.230"></a>
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+<span class="sourceLineNo">240</span><a name="line.240"></a>
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class<a name="line.242"></a>
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checkAndLoadInstance(Class&lt;?&gt; implClass, int priority, Configuration 
conf)<a name="line.247"></a>
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name="line.248"></a>
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name="line.249"></a>
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name="line.258"></a>
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priority, loadSequence.incrementAndGet(), conf);<a name="line.261"></a>
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env).startup();<a name="line.263"></a>
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loaded coprocessors for later crash analysis<a name="line.264"></a>
+<span class="sourceLineNo">265</span>    // if server (master or regionserver) 
aborts.<a name="line.265"></a>
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coprocessorNames.add(implClass.getName());<a name="line.266"></a>
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+<span class="sourceLineNo">269</span><a name="line.269"></a>
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+<span class="sourceLineNo">272</span>   */<a name="line.272"></a>
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implementation expects. If it is of correct type, returns an<a 
name="line.277"></a>
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loaded. If not, returns null.<a name="line.278"></a>
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to create instance of a coprocessor, it's passed up and<a name="line.279"></a>
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aborting.<a name="line.280"></a>
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checkAndGetInstance(Class&lt;?&gt; implClass)<a name="line.282"></a>
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IllegalAccessException;<a name="line.283"></a>
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name="line.287"></a>
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e.getInstance().getClass().getName());<a name="line.288"></a>
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e).shutdown();<a name="line.290"></a>
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+<span class="sourceLineNo">295</span>   */<a name="line.295"></a>
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(env.getInstance().getClass().getName().equals(className) ||<a 
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env.getInstance().getClass().getSimpleName().equals(className)) {<a 
name="line.299"></a>
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+<span class="sourceLineNo">306</span>  @VisibleForTesting<a 
name="line.306"></a>
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findCoprocessor(Class&lt;T&gt; cls) {<a name="line.307"></a>
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+<span class="sourceLineNo">309</span>      if 
(cls.isAssignableFrom(env.getInstance().getClass())) {<a name="line.309"></a>
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+<span class="sourceLineNo">315</span><a name="line.315"></a>
+<span class="sourceLineNo">316</span>  /**<a name="line.316"></a>
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extend/implement the given class/interface<a name="line.317"></a>
+<span class="sourceLineNo">318</span>   * @param cls the class/interface to 
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(cls.isAssignableFrom(cp.getClass())) {<a name="line.328"></a>
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+<span class="sourceLineNo">335</span><a name="line.335"></a>
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+<span class="sourceLineNo">337</span>   * Find a coprocessor environment by 
class name<a name="line.337"></a>
+<span class="sourceLineNo">338</span>   * @param className the class name<a 
name="line.338"></a>
+<span class="sourceLineNo">339</span>   * @return the coprocessor, or null if 
not found<a name="line.339"></a>
+<span class="sourceLineNo">340</span>   */<a name="line.340"></a>
+<span class="sourceLineNo">341</span>  @VisibleForTesting<a 
name="line.341"></a>
+<span class="sourceLineNo">342</span>  public E 
findCoprocessorEnvironment(String className) {<a name="line.342"></a>
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name="line.343"></a>
+<span class="sourceLineNo">344</span>      if 
(env.getInstance().getClass().getName().equals(className) ||<a 
name="line.344"></a>
+<span class="sourceLineNo">345</span>          
env.getInstance().getClass().getSimpleName().equals(className)) {<a 
name="line.345"></a>
+<span class="sourceLineNo">346</span>        return env;<a name="line.346"></a>
+<span class="sourceLineNo">347</span>      }<a name="line.347"></a>
+<span class="sourceLineNo">348</span>    }<a name="line.348"></a>
+<span class="sourceLineNo">349</span>    return null;<a name="line.349"></a>
+<span class="sourceLineNo">350</span>  }<a name="line.350"></a>
+<span class="sourceLineNo">351</span><a name="line.351"></a>
+<span class="sourceLineNo">352</span>  /**<a name="line.352"></a>
+<span class="sourceLineNo">353</span>   * Retrieves the set of classloaders 
used to instantiate Coprocessor classes defined in external<a 
name="line.353"></a>
+<span class="sourceLineNo">354</span>   * jar files.<a name="line.354"></a>
+<span class="sourceLineNo">355</span>   * @return A set of ClassLoader 
instances<a name="line.355"></a>
+<span class="sourceLineNo">356</span>   */<a name="line.356"></a>
+<span class="sourceLineNo">357</span>  Set&lt;ClassLoader&gt; 
getExternalClassLoaders() {<a name="line.357"></a>
+<span class="sourceLineNo">358</span>    Set&lt;ClassLoader&gt; 
externalClassLoaders = new HashSet&lt;&gt;();<a name="line.358"></a>
+<span class="sourceLineNo">359</span>    final ClassLoader systemClassLoader = 
this.getClass().getClassLoader();<a name="line.359"></a>
+<span class="sourceLineNo">360</span>    for (E env : coprocEnvironments) {<a 
name="line.360"></a>
+<span class="sourceLineNo">361</span>      ClassLoader cl = 
env.getInstance().getClass().getClassLoader();<a name="line.361"></a>
+<span class="sourceLineNo">362</span>      if (cl != systemClassLoader){<a 
name="line.362"></a>
+<span class="sourceLineNo">363</span>        //do not include system 
classloader<a name="line.363"></a>
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name="line.364"></a>
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+<span class="sourceLineNo">366</span>    }<a name="line.366"></a>
+<span class="sourceLineNo">367</span>    return externalClassLoaders;<a 
name="line.367"></a>
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+<span class="sourceLineNo">369</span><a name="line.369"></a>
+<span class="sourceLineNo">370</span>  /**<a name="line.370"></a>
+<span class="sourceLineNo">371</span>   * Environment priority comparator.<a 
name="line.371"></a>
+<span class="sourceLineNo">372</span>   * Coprocessors are chained in sorted 
order.<a name="line.372"></a>
+<span class="sourceLineNo">373</span>   */<a name="line.373"></a>
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EnvironmentPriorityComparator implements 
Comparator&lt;CoprocessorEnvironment&gt; {<a name="line.374"></a>
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CoprocessorEnvironment env1,<a name="line.376"></a>
+<span class="sourceLineNo">377</span>        final CoprocessorEnvironment 
env2) {<a name="line.377"></a>
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env2.getPriority()) {<a name="line.378"></a>
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+<span class="sourceLineNo">380</span>      } else if (env1.getPriority() &gt; 
env2.getPriority()) {<a name="line.380"></a>
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+<span class="sourceLineNo">382</span>      }<a name="line.382"></a>
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env2.getLoadSequence()) {<a name="line.383"></a>
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+<span class="sourceLineNo">385</span>      } else if (env1.getLoadSequence() 
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+<span class="sourceLineNo">391</span><a name="line.391"></a>
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environment, final Throwable e) {<a name="line.392"></a>
+<span class="sourceLineNo">393</span>    
abortServer(environment.getInstance().getClass().getName(), e);<a 
name="line.393"></a>
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+<span class="sourceLineNo">395</span><a name="line.395"></a>
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coprocessorName + " threw " + e.toString();<a name="line.397"></a>
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name="line.398"></a>
+<span class="sourceLineNo">399</span>    if (abortable != null) {<a 
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name="line.400"></a>
+<span class="sourceLineNo">401</span>    } else {<a name="line.401"></a>
+<span class="sourceLineNo">402</span>      LOG.warn("No available Abortable, 
process was not aborted");<a name="line.402"></a>
+<span class="sourceLineNo">403</span>    }<a name="line.403"></a>
+<span class="sourceLineNo">404</span>  }<a name="line.404"></a>
+<span class="sourceLineNo">405</span><a name="line.405"></a>
+<span class="sourceLineNo">406</span>  /**<a name="line.406"></a>
+<span class="sourceLineNo">407</span>   * This is used by coprocessor hooks 
which are declared to throw IOException<a name="line.407"></a>
+<span class="sourceLineNo">408</span>   * (or its subtypes). For such hooks, 
we should handle throwable objects<a name="line.408"></a>
+<span class="sourceLineNo">409</span>   * depending on the Throwable's type. 
Those which are instances of<a name="line.409"></a>
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the client. This is in conformance with<a name="line.410"></a>
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IOException: that it represents a circumstance<a name="line.411"></a>
+<span class="sourceLineNo">412</span>   * that should be passed along to the 
client for its own handling. For<a name="line.412"></a>
+<span class="sourceLineNo">413</span>   * example, a coprocessor that 
implements access controls would throw a<a name="line.413"></a>
+<span class="sourceLineNo">414</span>   * subclass of IOException, such as 
AccessDeniedException, in its preGet()<a name="line.414"></a>
+<span class="sourceLineNo">415</span>   * method to prevent an unauthorized 
client's performing a Get on a particular<a name="line.415"></a>
+<span class="sourceLineNo">416</span>   * table.<a name="line.416"></a>
+<span class="sourceLineNo">417</span>   * @param env Coprocessor Environment<a 
name="line.417"></a>
+<span class="sourceLineNo">418</span>   * @param e Throwable object thrown by 
coprocessor.<a name="line.418"></a>
+<span class="sourceLineNo">419</span>   * @exception IOException Exception<a 
name="line.419"></a>
+<span class="sourceLineNo">420</span>   */<a name="line.420"></a>
+<span class="sourceLineNo">421</span>  // Note to devs: Class comments of all 
observers ({@link MasterObserver}, {@link WALObserver},<a name="line.421"></a>
+<span class="sourceLineNo">422</span>  // etc) mention this nuance of our 
exception handling so that coprocessor can throw appropriate<a 
name="line.422"></a>
+<span class="sourceLineNo">423</span>  // exceptions depending on situation. 
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+<span class="sourceLineNo">424</span>  // update all classes' comments.<a 
name="line.424"></a>
+<span class="sourceLineNo">425</span>  protected void 
handleCoprocessorThrowable(final E env, final Throwable e) throws IOException 
{<a name="line.425"></a>
+<span class="sourceLineNo">426</span>    if (e instanceof IOException) {<a 
name="line.426"></a>
+<span class="sourceLineNo">427</span>      throw (IOException)e;<a 
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+<span class="sourceLineNo">430</span>    // fatal bug, and the server (master 
or regionserver) should remove the<a name="line.430"></a>
+<span class="sourceLineNo">431</span>    // faulty coprocessor from its set of 
active coprocessors. Setting<a name="line.431"></a>
+<span class="sourceLineNo">432</span>    // 'hbase.coprocessor.abortonerror' 
to true will cause abortServer(),<a name="line.432"></a>
+<span class="sourceLineNo">433</span>    // which may be useful in development 
and testing environments where<a name="line.433"></a>
+<span class="sourceLineNo">434</span>    // 'failing fast' for error analysis 
is desired.<a name="line.434"></a>
+<span class="sourceLineNo">435</span>    if 
(env.getConfiguration().getBoolean(ABORT_ON_ERROR_KEY, DEFAULT_ABORT_ON_ERROR)) 
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name="line.436"></a>
+<span class="sourceLineNo">437</span>      abortServer(env, e);<a 
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+<span class="sourceLineNo">438</span>    } else {<a name="line.438"></a>
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out of the environment<a name="line.439"></a>
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RegionCoprocessorEnvironment) {<a name="line.440"></a>
+<span class="sourceLineNo">441</span>        String tableName = 
((RegionCoprocessorEnvironment)env).getRegionInfo().getTable().getNameAsString();<a
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'" + env.toString() + "' from table '"+ tableName + "'", e);<a 
name="line.442"></a>
+<span class="sourceLineNo">443</span>      } else {<a name="line.443"></a>
+<span class="sourceLineNo">444</span>        LOG.error("Removing coprocessor 
'" + env.toString() + "' from " +<a name="line.444"></a>
+<span class="sourceLineNo">445</span>                "environment",e);<a 
name="line.445"></a>
+<span class="sourceLineNo">446</span>      }<a name="line.446"></a>
+<span class="sourceLineNo">447</span><a name="line.447"></a>
+<span class="sourceLineNo">448</span>      coprocEnvironments.remove(env);<a 
name="line.448"></a>
+<span class="sourceLineNo">449</span>      try {<a name="line.449"></a>
+<span class="sourceLineNo">450</span>        shutdown(env);<a 
name="line.450"></a>
+<span class="sourceLineNo">451</span>      } catch (Exception x) {<a 
name="line.451"></a>
+<span class="sourceLineNo">452</span>        LOG.error("Uncaught exception 
when shutting down coprocessor '"<a name="line.452"></a>
+<span class="sourceLineNo">453</span>            + env.toString() + "'", x);<a 
name="line.453"></a>
+<span class="sourceLineNo">454</span>      }<a name="line.454"></a>
+<span class="sourceLineNo">455</span>      throw new 
DoNotRetryIOException("Coprocessor: '" + env.toString() +<a name="line.455"></a>
+<span class="sourceLineNo">456</span>          "' threw: '" + e + "' and has 
been removed from the active " +<a name="line.456"></a>
+<span class="sourceLineNo">457</span>          "coprocessor set.", e);<a 
name="line.457"></a>
+<span class="sourceLineNo">458</span>    }<a name="line.458"></a>
+<span class="sourceLineNo">459</span>  }<a name="line.459"></a>
+<span class="sourceLineNo">460</span><a name="line.460"></a>
+<span class="sourceLineNo">461</span>  /**<a name="line.461"></a>
+<span class="sourceLineNo">462</span>   * Used to limit legacy handling to 
once per Coprocessor class per classloader.<a name="line.462"></a>
+<span class="sourceLineNo">463</span>   */<a name="line.463"></a>
+<span class="sourceLineNo">464</span>  private static final Set&lt;Class&lt;? 
extends Coprocessor&gt;&gt; legacyWarning =<a name="line.464"></a>
+<span class="sourceLineNo">465</span>      new 
ConcurrentSkipListSet&lt;&gt;(<a name="line.465"></a>
+<span class="sourceLineNo">466</span>          new Comparator&lt;Class&lt;? 
extends Coprocessor&gt;&gt;() {<a name="line.466"></a>
+<span class="sourceLineNo">467</span>            @Override<a 
name="line.467"></a>
+<span class="sourceLineNo">468</span>            public int compare(Class&lt;? 
extends Coprocessor&gt; c1, Class&lt;? extends Coprocessor&gt; c2) {<a 
name="line.468"></a>
+<span class="sourceLineNo">469</span>              if (c1.equals(c2)) {<a 
name="line.469"></a>
+<span class="sourceLineNo">470</span>                return 0;<a 
name="line.470"></a>
+<span class="sourceLineNo">471</span>              }<a name="line.471"></a>
+<span class="sourceLineNo">472</span>              return 
c1.getName().compareTo(c2.getName());<a name="line.472"></a>
+<span class="sourceLineNo">473</span>            }<a name="line.473"></a>
+<span class="sourceLineNo">474</span>          });<a name="line.474"></a>
+<span class="sourceLineNo">475</span><a name="line.475"></a>
+<span class="sourceLineNo">476</span>  /**<a name="line.476"></a>
+<span class="sourceLineNo">477</span>   * Implementations defined function to 
get an observer of type {@code O} from a coprocessor of<a name="line.477"></a>
+<span class="sourceLineNo">478</span>   * type {@code C}. Concrete 
implementations of CoprocessorHost define one getter for each<a 
name="line.478"></a>
+<span class="sourceLineNo">479</span>   * observer they can handle. For e.g. 
RegionCoprocessorHost will use 3 getters, one for<a name="line.479"></a>
+<span class="sourceLineNo">480</span>   * each of RegionObserver, 
EndpointObserver and BulkLoadObserver.<a name="line.480"></a>
+<span class="sourceLineNo">481</span>   * These getters are used by {@code 
ObserverOperation} to get appropriate observer from the<a name="line.481"></a>
+<span class="sourceLineNo">482</span>   * coprocessor.<a name="line.482"></a>
+<span class="sourceLineNo">483</span>   */<a name="line.483"></a>
+<span class="sourceLineNo">484</span>  @FunctionalInterface<a 
name="line.484"></a>
+<span class="sourceLineNo">485</span>  public interface ObserverGetter&lt;C, 
O&gt; extends Function&lt;C, Optional&lt;O&gt;&gt; {}<a name="line.485"></a>
+<span class="sourceLineNo">486</span><a name="line.486"></a>
+<span class="sourceLineNo">487</span>  private abstract class 
ObserverOperation&lt;O&gt; extends ObserverContextImpl&lt;E&gt; {<a 
name="line.487"></a>
+<span class="sourceLineNo">488</span>    ObserverGetter&lt;C, O&gt; 
observerGetter;<a name="line.488"></a>
+<span class="sourceLineNo">489</span><a name="line.489"></a>
+<span class="sourceLineNo">490</span>    
ObserverOperation(ObserverGetter&lt;C, O&gt; observerGetter) {<a 
name="line.490"></a>
+<span class="sourceLineNo">491</span>      this(observerGetter, null);<a 
name="line.491"></a>
+<span class="sourceLineNo">492</span>    }<a name="line.492"></a>
+<span class="sourceLineNo">493</span><a name="line.493"></a>
+<span class="sourceLineNo">494</span>    
ObserverOperation(ObserverGetter&lt;C, O&gt; observerGetter, User user) {<a 
name="line.494"></a>
+<span class="sourceLineNo">495</span>      this(observerGetter, user, 
false);<a name="line.495"></a>
+<span class="sourceLineNo">496</span>    }<a name="line.496"></a>
+<span class="sourceLineNo">497</span><a name="line.497"></a>
+<span class="sourceLineNo">498</span>    
ObserverOperation(ObserverGetter&lt;C, O&gt; observerGetter, boolean 
bypassable) {<a name="line.498"></a>
+<span class="sourceLineNo">499</span>      this(observerGetter, null, 
bypassable);<a name="line.499"></a>
+<span class="sourceLineNo">500</span>    }<a name="line.500"></a>
+<span class="sourceLineNo">501</span><a name="line.501"></a>
+<span class="sourceLineNo">502</span>    
ObserverOperation(ObserverGetter&lt;C, O&gt; observerGetter, User user, boolean 
bypassable) {<a name="line.502"></a>
+<span class="sourceLineNo">503</span>      super(user != null? user: 
RpcServer.getRequestUser().orElse(null), bypassable);<a name="line.503"></a>
+<span class="sourceLineNo">504</span>      this.observerGetter = 
observerGetter;<a name="line.504"></a>
+<span class="sourceLineNo">505</span>    }<a name="line.505"></a>
+<span class="sourceLineNo">506</span><a name="line.506"></a>
+<span class="sourceLineNo">507</span>    abstract void callObserver() throws 
IOException;<a name="line.507"></a>
+<span class="sourceLineNo">508</span>    protected void postEnvCall() {}<a 
name="line.508"></a>
+<span class="sourceLineNo">509</span>  }<a name="line.509"></a>
+<span class="sourceLineNo">510</span><a name="line.510"></a>
+<span class="sourceLineNo">511</span>  // Can't derive ObserverOperation from 
ObserverOperationWithResult (R = Void) because then all<a name="line.511"></a>
+<span class="sourceLineNo">512</span>  // ObserverCaller implementations will 
have to have a return statement.<a name="line.512"></a>
+<span class="sourceLineNo">513</span>  // O = observer, E = environment, C = 
coprocessor, R=result type<a name="line.513"></a>
+<span class="sourceLineNo">514</span>  public abstract class 
ObserverOperationWithoutResult&lt;O&gt; extends ObserverOperation&lt;O&gt; {<a 
name="line.514"></a>
+<span class="sourceLineNo">515</span>    protected abstract void call(O 
observer) throws IOException;<a name="line.515"></a>
+<span class="sourceLineNo">516</span><a name="line.516"></a>
+<span class="sourceLineNo">517</span>    public 
ObserverOperationWithoutResult(ObserverGetter&lt;C, O&gt; observerGetter) {<a 
name="line.517"></a>
+<span class="sourceLineNo">518</span>      super(observerGetter);<a 
name="line.518"></a>
+<span class="sourceLineNo">519</span>    }<a name="line.519"></a>
+<span class="sourceLineNo">520</span><a name="line.520"></a>
+<span class="sourceLineNo">521</span>    public 
ObserverOperationWithoutResult(ObserverGetter&lt;C, O&gt; observerGetter, User 
user) {<a name="line.521"></a>
+<span class="sourceLineNo">522</span>      super(observerGetter, user);<a 
name="line.522"></a>
+<span class="sourceLineNo">523</span>    }<a name="line.523"></a>
+<span class="sourceLineNo">524</span><a name="line.524"></a>
+<span class="sourceLineNo">525</span>    public 
ObserverOperationWithoutResult(ObserverGetter&lt;C, O&gt; observerGetter, User 
user,<a name="line.525"></a>
+<span class="sourceLineNo">526</span>        boolean bypassable) {<a 
name="line.526"></a>
+<span class="sourceLineNo">527</span>      super(observerGetter, user, 
bypassable);<a name="line.527"></a>
+<span class="sourceLineNo">528</span>    }<a name="line.528"></a>
+<span class="sourceLineNo">529</span><a name="line.529"></a>
+<span class="sourceLineNo">530</span>    /**<a name="line.530"></a>
+<span class="sourceLineNo">531</span>     * In case of coprocessors which have 
many kinds of observers (for eg, {@link RegionCoprocessor}<a 
name="line.531"></a>
+<span class="sourceLineNo">532</span>     * has BulkLoadObserver, 
RegionObserver, etc), some implementations may not need all<a 
name="line.532"></a>
+<span class="sourceLineNo">533</span>     * observers, in which case they will 
return null for that observer's getter.<a name="line.533"></a>
+<span class="sourceLineNo">534</span>     * We simply ignore such cases.<a 
name="line.534"></a>
+<span class="sourceLineNo">535</span>     */<a name="line.535"></a>


<TRUNCATED>

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