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| <h2 title="Class PleaseThrottleException" class="title">Class PleaseThrottleException</h2> |
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| <li>org.apache.kudu.client.PleaseThrottleException</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public final class <span class="typeNameLabel">PleaseThrottleException</span> |
| extends <a href="../../../../org/apache/kudu/client/KuduException.html" title="class in org.apache.kudu.client">KuduException</a> |
| implements <a href="../../../../org/apache/kudu/client/HasFailedRpcException.html" title="interface in org.apache.kudu.client">HasFailedRpcException</a></pre> |
| <div class="block">This exception notifies the application to throttle its use of Kudu. |
| <p> |
| Since all APIs of <a href="../../../../org/apache/kudu/client/AsyncKuduSession.html" title="class in org.apache.kudu.client"><code>AsyncKuduSession</code></a> are asynchronous and non-blocking, |
| it's possible that the application would produce RPCs at a rate higher |
| than Kudu is able to handle. When this happens, <a href="../../../../org/apache/kudu/client/AsyncKuduSession.html" title="class in org.apache.kudu.client"><code>AsyncKuduSession</code></a> |
| will typically do some buffering up to a certain point beyond which RPCs |
| will fail-fast with this exception, to prevent the application from |
| running itself out of memory. |
| <p> |
| This exception is expected to be handled by having the application |
| throttle or pause itself for a short period of time before retrying the |
| RPC that failed with this exception as well as before sending other RPCs. |
| The reason this exception inherits from <code>NonRecoverableException</code> |
| instead of <code>RecoverableException</code> is that the usual course of action |
| when handling a <code>RecoverableException</code> is to retry right away, which |
| would defeat the whole purpose of this exception. Here, we want the |
| application to <b>retry after a reasonable delay</b> as well as <b>throttle |
| the pace of creation of new RPCs</b>. What constitutes a "reasonable |
| delay" depends on the nature of RPCs and rate at which they're produced. |
| <p> |
| One effective strategy to handle this exception is to set a flag to true |
| when this exception is first emitted that causes the application to pause |
| or throttle its use of Kudu. Then you can retry the RPC that failed |
| (which is accessible through <a href="../../../../org/apache/kudu/client/PleaseThrottleException.html#getFailedRpc--"><code>getFailedRpc()</code></a>) and add a callback to |
| it in order to unset the flag once the RPC completes successfully. |
| Note that low-throughput applications will typically rarely (if ever) |
| hit this exception, so they don't need complex throttling logic.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../serialized-form.html#org.apache.kudu.client.PleaseThrottleException">Serialized Form</a></dd> |
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| <td class="colFirst"><code>com.stumbleupon.async.Deferred</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/PleaseThrottleException.html#getDeferred--">getDeferred</a></span>()</code> |
| <div class="block">Returns a deferred one can wait on before retrying the failed RPC.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/kudu/client/Operation.html" title="class in org.apache.kudu.client">Operation</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/PleaseThrottleException.html#getFailedRpc--">getFailedRpc</a></span>()</code> |
| <div class="block">The RPC that was made to fail with this exception.</div> |
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| <pre>public <a href="../../../../org/apache/kudu/client/Operation.html" title="class in org.apache.kudu.client">Operation</a> getFailedRpc()</pre> |
| <div class="block">The RPC that was made to fail with this exception.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/kudu/client/HasFailedRpcException.html#getFailedRpc--">getFailedRpc</a></code> in interface <code><a href="../../../../org/apache/kudu/client/HasFailedRpcException.html" title="interface in org.apache.kudu.client">HasFailedRpcException</a></code></dd> |
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| <h4>getDeferred</h4> |
| <pre>public com.stumbleupon.async.Deferred getDeferred()</pre> |
| <div class="block">Returns a deferred one can wait on before retrying the failed RPC.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.3</dd> |
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