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| <div class="subTitle">org.apache.beam.sdk.io.clickhouse</div> |
| <h2 title="Class ClickHouseIO" class="title">Class ClickHouseIO</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.io.clickhouse.ClickHouseIO</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SOURCE_SINK">SOURCE_SINK</a>) |
| public class <span class="typeNameLabel">ClickHouseIO</span> |
| extends java.lang.Object</pre> |
| <div class="block">An IO to write to ClickHouse. |
| |
| <h3>Writing to ClickHouse</h3> |
| |
| <p>To write to ClickHouse, use <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#write-java.lang.String-java.lang.String-"><code>write(String, String)</code></a>, which writes elements |
| from input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>. It's required that your ClickHouse cluster already has table you |
| are going to insert into. |
| |
| <pre><code> |
| pipeline |
| .apply(...) |
| .apply( |
| ClickHouseIO.<POJO>write("jdbc:clickhouse:localhost:8123/default", "my_table")); |
| </code></pre> |
| |
| <p>Optionally, you can provide connection settings, for instance, specify insert block size with |
| <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html#withMaxInsertBlockSize-long-"><code>ClickHouseIO.Write.withMaxInsertBlockSize(long)</code></a>, or configure number of retries with <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html#withMaxRetries-int-"><code>ClickHouseIO.Write.withMaxRetries(int)</code></a>. |
| |
| <h4>Deduplication</h4> |
| |
| Deduplication is performed by ClickHouse if inserting to <a |
| href="https://clickhouse.yandex/docs/en/single/#data-replication">ReplicatedMergeTree</a> or <a |
| href="https://clickhouse.yandex/docs/en/single/#distributed">Distributed</a> table on top of |
| ReplicatedMergeTree. Without replication, inserting into regular MergeTree can produce |
| duplicates, if insert fails, and then successfully retries. However, each block is inserted |
| atomically, and you can configure block size with <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html#withMaxInsertBlockSize-long-"><code>ClickHouseIO.Write.withMaxInsertBlockSize(long)</code></a>. |
| |
| <p>Deduplication is performed using checksums of inserted blocks. |
| |
| <h4>Mapping between Beam and ClickHouse types</h4> |
| |
| <table summary="Type mapping"> |
| <tr><th>ClickHouse</th> <th>Beam</th></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#FLOAT32"><code>TableSchema.TypeName.FLOAT32</code></a></td> <td><code>Schema.TypeName#FLOAT</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#FLOAT64"><code>TableSchema.TypeName.FLOAT64</code></a></td> <td><code>Schema.TypeName#DOUBLE</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#FIXEDSTRING"><code>TableSchema.TypeName.FIXEDSTRING</code></a></td> <td><a href="../../../../../../org/apache/beam/sdk/schemas/logicaltypes/FixedBytes.html" title="class in org.apache.beam.sdk.schemas.logicaltypes"><code>FixedBytes</code></a></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#INT8"><code>TableSchema.TypeName.INT8</code></a></td> <td><code>Schema.TypeName#BYTE</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#INT16"><code>TableSchema.TypeName.INT16</code></a></td> <td><code>Schema.TypeName#INT16</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#INT32"><code>TableSchema.TypeName.INT32</code></a></td> <td><code>Schema.TypeName#INT32</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#INT64"><code>TableSchema.TypeName.INT64</code></a></td> <td><code>Schema.TypeName#INT64</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#STRING"><code>TableSchema.TypeName.STRING</code></a></td> <td><code>Schema.TypeName#STRING</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#UINT8"><code>TableSchema.TypeName.UINT8</code></a></td> <td><code>Schema.TypeName#INT16</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#UINT16"><code>TableSchema.TypeName.UINT16</code></a></td> <td><code>Schema.TypeName#INT32</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#UINT32"><code>TableSchema.TypeName.UINT32</code></a></td> <td><code>Schema.TypeName#INT64</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#UINT64"><code>TableSchema.TypeName.UINT64</code></a></td> <td><code>Schema.TypeName#INT64</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#DATE"><code>TableSchema.TypeName.DATE</code></a></td> <td><code>Schema.TypeName#DATETIME</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#DATETIME"><code>TableSchema.TypeName.DATETIME</code></a></td> <td><code>Schema.TypeName#DATETIME</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#ARRAY"><code>TableSchema.TypeName.ARRAY</code></a></td> <td><code>Schema.TypeName#ARRAY</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#ENUM8"><code>TableSchema.TypeName.ENUM8</code></a></td> <td><code>Schema.TypeName#STRING</code></td></tr> |
| <tr><td><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.TypeName.html#ENUM16"><code>TableSchema.TypeName.ENUM16</code></a></td> <td><code>Schema.TypeName#STRING</code></td></tr> |
| </table> |
| |
| Nullable row columns are supported through Nullable type in ClickHouse. |
| |
| <p>Nested rows should be unnested using <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.html" title="class in org.apache.beam.sdk.schemas.transforms"><code>Unnest</code></a>. |
| Type casting should be done using <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Cast.html" title="class in org.apache.beam.sdk.schemas.transforms"><code>Cast</code></a> before |
| <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html" title="class in org.apache.beam.sdk.io.clickhouse"><code>ClickHouseIO</code></a>.</div> |
| </li> |
| </ul> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html" title="class in org.apache.beam.sdk.io.clickhouse">ClickHouseIO.Write</a><<a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html" title="type parameter in ClickHouseIO.Write">T</a>></span></code> |
| <div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> to write to ClickHouse.</div> |
| </td> |
| </tr> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#DEFAULT_INITIAL_BACKOFF">DEFAULT_INITIAL_BACKOFF</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#DEFAULT_MAX_CUMULATIVE_BACKOFF">DEFAULT_MAX_CUMULATIVE_BACKOFF</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#DEFAULT_MAX_INSERT_BLOCK_SIZE">DEFAULT_MAX_INSERT_BLOCK_SIZE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#DEFAULT_MAX_RETRIES">DEFAULT_MAX_RETRIES</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#ClickHouseIO--">ClickHouseIO</a></span>()</code> </td> |
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| <tr> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.html" title="class in org.apache.beam.sdk.io.clickhouse">TableSchema</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#getTableSchema-java.lang.String-java.lang.String-">getTableSchema</a></span>(java.lang.String jdbcUrl, |
| java.lang.String table)</code> |
| <div class="block">Returns <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.html" title="class in org.apache.beam.sdk.io.clickhouse"><code>TableSchema</code></a> for a given table.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html" title="class in org.apache.beam.sdk.io.clickhouse">ClickHouseIO.Write</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.html#write-java.lang.String-java.lang.String-">write</a></span>(java.lang.String jdbcUrl, |
| java.lang.String table)</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <a name="DEFAULT_MAX_INSERT_BLOCK_SIZE"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>DEFAULT_MAX_INSERT_BLOCK_SIZE</h4> |
| <pre>public static final long DEFAULT_MAX_INSERT_BLOCK_SIZE</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.beam.sdk.io.clickhouse.ClickHouseIO.DEFAULT_MAX_INSERT_BLOCK_SIZE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="DEFAULT_MAX_RETRIES"> |
| <!-- --> |
| </a> |
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| <h4>DEFAULT_MAX_RETRIES</h4> |
| <pre>public static final int DEFAULT_MAX_RETRIES</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.beam.sdk.io.clickhouse.ClickHouseIO.DEFAULT_MAX_RETRIES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <a name="DEFAULT_MAX_CUMULATIVE_BACKOFF"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>DEFAULT_MAX_CUMULATIVE_BACKOFF</h4> |
| <pre>public static final <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> DEFAULT_MAX_CUMULATIVE_BACKOFF</pre> |
| </li> |
| </ul> |
| <a name="DEFAULT_INITIAL_BACKOFF"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>DEFAULT_INITIAL_BACKOFF</h4> |
| <pre>public static final <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> DEFAULT_INITIAL_BACKOFF</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <ul class="blockList"> |
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| <h3>Constructor Detail</h3> |
| <a name="ClickHouseIO--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ClickHouseIO</h4> |
| <pre>public ClickHouseIO()</pre> |
| </li> |
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| <h4>write</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/ClickHouseIO.Write.html" title="class in org.apache.beam.sdk.io.clickhouse">ClickHouseIO.Write</a><T> write(java.lang.String jdbcUrl, |
| java.lang.String table)</pre> |
| </li> |
| </ul> |
| <a name="getTableSchema-java.lang.String-java.lang.String-"> |
| <!-- --> |
| </a> |
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| <h4>getTableSchema</h4> |
| <pre>public static <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.html" title="class in org.apache.beam.sdk.io.clickhouse">TableSchema</a> getTableSchema(java.lang.String jdbcUrl, |
| java.lang.String table)</pre> |
| <div class="block">Returns <a href="../../../../../../org/apache/beam/sdk/io/clickhouse/TableSchema.html" title="class in org.apache.beam.sdk.io.clickhouse"><code>TableSchema</code></a> for a given table.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>jdbcUrl</code> - jdbc connection url</dd> |
| <dd><code>table</code> - table name</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>table schema</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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