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| Detachable Types |
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| Overview |
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| Geotypes |
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| Graph |
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| Overview |
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| Overview |
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| Explicit |
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| Implicit |
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| Options |
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| Results |
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| Script |
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| <h2 id="frequently-asked-questions">Frequently asked questions<a class="headerlink" href="#frequently-asked-questions" title="Permanent link">¶</a></h2> |
| <h3 id="im-modifying-a-statement-and-the-changes-get-ignored-why">I'm modifying a statement and the changes get ignored, why?<a class="headerlink" href="#im-modifying-a-statement-and-the-changes-get-ignored-why" title="Permanent link">¶</a></h3> |
| <p>In driver 4, statement classes are <strong>immutable</strong>. All mutating methods return a new instance, so |
| make sure you don't accidentally ignore their result:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">BoundStatement</span><span class="w"> </span><span class="n">boundSelect</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">preparedSelect</span><span class="p">.</span><span class="na">bind</span><span class="p">();</span> |
| |
| <span class="c1">// This doesn't work: setInt and setPageSize don't modify boundSelect in place:</span> |
| <span class="n">boundSelect</span><span class="p">.</span><span class="na">setInt</span><span class="p">(</span><span class="s">"k"</span><span class="p">,</span><span class="w"> </span><span class="n">key</span><span class="p">);</span> |
| <span class="n">boundSelect</span><span class="p">.</span><span class="na">setPageSize</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span> |
| <span class="n">session</span><span class="p">.</span><span class="na">execute</span><span class="p">(</span><span class="n">boundSelect</span><span class="p">);</span> |
| |
| <span class="c1">// Instead, reassign the statement every time:</span> |
| <span class="n">boundSelect</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">boundSelect</span><span class="p">.</span><span class="na">setInt</span><span class="p">(</span><span class="s">"k"</span><span class="p">,</span><span class="w"> </span><span class="n">key</span><span class="p">).</span><span class="na">setPageSize</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span> |
| </code></pre></div> |
| <p>All of these mutating methods are annotated with <code>@CheckReturnValue</code>. Some code analysis tools -- |
| such as <a href="https://errorprone.info/">ErrorProne</a> -- can check correct usage at build time, and report |
| mistakes as compiler errors.</p> |
| <p>The driver also provides builders:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">BoundStatement</span><span class="w"> </span><span class="n">boundSelect</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">preparedSelect</span><span class="p">.</span><span class="na">boundStatementBuilder</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">setInt</span><span class="p">(</span><span class="s">"k"</span><span class="p">,</span><span class="w"> </span><span class="n">key</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">setPageSize</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">build</span><span class="p">();</span> |
| </code></pre></div> |
| <h3 id="why-do-asynchronous-methods-return-completionstaget-instead-of-completablefuturet">Why do asynchronous methods return <code>CompletionStage<T></code> instead of <code>CompletableFuture<T></code>?<a class="headerlink" href="#why-do-asynchronous-methods-return-completionstaget-instead-of-completablefuturet" title="Permanent link">¶</a></h3> |
| <p>Because it's the right abstraction to use. A completable future, as its name indicates, is a future |
| that can be completed manually; that is not what we want to return from our API: the driver |
| completes the futures, not the user.</p> |
| <p>Also, <code>CompletionStage</code> does not expose a <code>get()</code> method; one can view that as an encouragement to |
| use a fully asynchronous programming model (chaining callbacks instead of blocking for a result).</p> |
| <p>At any rate, <code>CompletionStage</code> has a <code>toCompletableFuture()</code> method. In current JDK versions, every |
| <code>CompletionStage</code> is a <code>CompletableFuture</code>, so the conversion has no performance overhead.</p> |
| <h3 id="where-is-downgradingconsistencyretrypolicy-from-driver-3">Where is <code>DowngradingConsistencyRetryPolicy</code> from driver 3?<a class="headerlink" href="#where-is-downgradingconsistencyretrypolicy-from-driver-3" title="Permanent link">¶</a></h3> |
| <p><strong>As of driver 4.10, this retry policy was made available again as a built-in alternative to the |
| default retry policy</strong>: see the <a href="../manual/core/retries">manual</a> to understand how to use it. |
| For versions between 4.0 and 4.9 inclusive, there is no built-in equivalent of driver 3 |
| <code>DowngradingConsistencyRetryPolicy</code>.</p> |
| <p>That retry policy was indeed removed in driver 4.0.0. The main motivation is that this behavior |
| should be the application's concern, not the driver's. APIs provided by the driver should instead |
| encourage idiomatic use of a distributed system like Apache Cassandra, and a downgrading policy |
| works against this. It suggests that an anti-pattern such as "try to read at QUORUM, but fall back |
| to ONE if that fails" is a good idea in general use cases, when in reality it provides no better |
| consistency guarantees than working directly at ONE, but with higher latencies. </p> |
| <p>However, we recognize that there are use cases where downgrading is good -- for instance, a |
| dashboard application would present the latest information by reading at QUORUM, but it's acceptable |
| for it to display stale information by reading at ONE sometimes. </p> |
| <p>Thanks to <a href="https://datastax-oss.atlassian.net/browse/JAVA-2900">JAVA-2900</a>, an equivalent retry policy with downgrading behavior was re-introduced in |
| driver 4.10. Nonetheless, we urge users to avoid using it unless strictly required, and instead, |
| carefully choose upfront the consistency level that works best for their use cases. Even if there |
| is a legitimate reason to downgrade and retry, that should be preferably handled by the application |
| code. An example of downgrading retries implemented at application level can be found in the driver |
| <a href="https://github.com/datastax/java-driver/blob/4.x/examples/src/main/java/com/datastax/oss/driver/examples/retry/DowngradingRetry.java">examples repository</a>.</p> |
| <h3 id="where-is-the-cross-datacenter-failover-feature-that-existed-in-driver-3">Where is the cross-datacenter failover feature that existed in driver 3?<a class="headerlink" href="#where-is-the-cross-datacenter-failover-feature-that-existed-in-driver-3" title="Permanent link">¶</a></h3> |
| <p>In driver 3, it was possible to configure the load balancing policy to automatically failover to |
| a remote datacenter, when the local datacenter is down.</p> |
| <p>This ability is considered a misfeature and has been removed from driver 4.0 onwards.</p> |
| <p>However, due to popular demand, cross-datacenter failover has been brought back to driver 4 in |
| version 4.10.0.</p> |
| <p>If you are using a driver version >= 4.10.0, read the <a href="../manual/core/loadbalancing/">manual</a> to |
| understand how to enable this feature; for driver versions < 4.10.0, this feature is simply not |
| available.</p> |
| <h3 id="i-want-to-set-a-date-on-a-bound-statement-where-did-settimestamp-go">I want to set a date on a bound statement, where did <code>setTimestamp()</code> go?<a class="headerlink" href="#i-want-to-set-a-date-on-a-bound-statement-where-did-settimestamp-go" title="Permanent link">¶</a></h3> |
| <p>The driver now uses Java 8's improved date and time API. CQL type <code>timestamp</code> is mapped to |
| <code>java.time.Instant</code>, and the corresponding getter and setter are <code>getInstant</code> and <code>setInstant</code>.</p> |
| <p>See <a href="../manual/core/temporal_types/">Temporal types</a> for more details.</p> |
| <h3 id="why-do-ddl-queries-have-a-higher-latency-than-driver-3">Why do DDL queries have a higher latency than driver 3?<a class="headerlink" href="#why-do-ddl-queries-have-a-higher-latency-than-driver-3" title="Permanent link">¶</a></h3> |
| <p>If you benchmark DDL queries such as <code>session.execute("CREATE TABLE ...")</code>, you will observe a |
| noticeably higher latency than driver 3 (about 1 second).</p> |
| <p>This is because those queries are now <em>debounced</em>: the driver adds a short wait in an attempt to |
| group multiple schema changes into a single metadata refresh. If you want to mitigate this, you can |
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