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[40/51] [partial] hbase-site git commit: Published site at .
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- method. The same ObserverContext instance is passed sequentially to all loaded
+ method. The same ObserverContext instance is passed sequentially to all loaded
coprocessors for a given Observer method trigger, with the
- <code>CoprocessorEnvironment</code> reference swapped out for each
- coprocessor.</div>
+ <code>CoprocessorEnvironment</code> reference set appropriately for each Coprocessor type:
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+ <p>This behavior of honoring only a subset of methods is new since hbase-2.0.0.
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+ What is skipped is extremely version dependent. The core code will vary, perhaps significantly,
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+ point releases for the bypass semantic. To achieve
+ that we could not change any code between hook points. Therefore the
+ coprocessor implementer becomes an HBase core developer in practice as soon
+ as they rely on bypass(). Every release of HBase may break the assumption
+ that the replacement for the bypassed code takes care of all necessary
+ skipped concerns. Because those concerns can change at any point, such an
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+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../org/apache/hadoop/hbase/coprocessor/ObserverContext.html#complete--"><code>complete()</code></a></dd>
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- is definitive.</div>
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+ <p>Since hbase-2.0.0, only <code>complete</code> of 'bypassable' methods has an effect. See
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-<div class="block">Call to indicate that the current coprocessor's return value should be
- used in place of the normal HBase obtained value.</div>
+<div class="block">Call to indicate that the current coprocessor's return value (or parameter -- depends on the
+ call-type) should be used in place of the value that would be obtained via normal processing;
+ i.e. bypass the core call and return the Coprocessor's result instead. DOES NOT work for all
+ Coprocessor invocations, only on a small subset of methods, mostly preXXX calls in
+ RegionObserver. Check javadoc on the pertinent Coprocessor Observer to see if
+ <code>bypass</code> is supported.
+ <p>This behavior of honoring only a subset of methods is new since hbase-2.0.0.
+ <p>Where bypass is supported what is being bypassed is all of the core code
+ implementing the remainder of the operation. In order to understand what
+ calling bypass() will skip, a coprocessor implementer should read and
+ understand all of the remaining code and its nuances. Although this
+ is good practice for coprocessor developers in general, it demands a lot.
+ What is skipped is extremely version dependent. The core code will vary, perhaps significantly,
+ even between point releases. We do not provide the promise of consistent behavior even between
+ point releases for the bypass semantic. To achieve
+ that we could not change any code between hook points. Therefore the
+ coprocessor implementer becomes an HBase core developer in practice as soon
+ as they rely on bypass(). Every release of HBase may break the assumption
+ that the replacement for the bypassed code takes care of all necessary
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-<div class="block">Call to indicate that additional coprocessors further down the execution
- chain do not need to be invoked. Implies that this coprocessor's response
- is definitive.</div>
+<div class="block">Call to skip out on calling remaining coprocessors in current execution chain (there may be
+ more than one coprocessor chained to a method call). Implies that this coprocessor's response
+ is definitive.
+ <p>Since hbase-2.0.0, only <code>complete</code> of 'bypassable' methods has an effect. See
+ javadoc on the Coprocessor Observer method as to whether bypass (and thereby 'complete') is
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