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<h1 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permanent link">🔗</a></h1>
<h2 id="table-properties">Table properties<a class="headerlink" href="#table-properties" title="Permanent link">🔗</a></h2>
<p>Iceberg tables support table properties to configure table behavior, like the default split size for readers.</p>
<h3 id="read-properties">Read properties<a class="headerlink" href="#read-properties" title="Permanent link">🔗</a></h3>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>read.split.target-size</td>
<td>134217728 (128 MB)</td>
<td>Target size when combining data input splits</td>
</tr>
<tr>
<td>read.split.metadata-target-size</td>
<td>33554432 (32 MB)</td>
<td>Target size when combining metadata input splits</td>
</tr>
<tr>
<td>read.split.planning-lookback</td>
<td>10</td>
<td>Number of bins to consider when combining input splits</td>
</tr>
<tr>
<td>read.split.open-file-cost</td>
<td>4194304 (4 MB)</td>
<td>The estimated cost to open a file, used as a minimum weight when combining splits.</td>
</tr>
<tr>
<td>read.parquet.vectorization.enabled</td>
<td>true</td>
<td>Controls whether Parquet vectorized reads are used</td>
</tr>
<tr>
<td>read.parquet.vectorization.batch-size</td>
<td>5000</td>
<td>The batch size for parquet vectorized reads</td>
</tr>
<tr>
<td>read.orc.vectorization.enabled</td>
<td>false</td>
<td>Controls whether orc vectorized reads are used</td>
</tr>
<tr>
<td>read.orc.vectorization.batch-size</td>
<td>5000</td>
<td>The batch size for orc vectorized reads</td>
</tr>
</tbody>
</table>
<h3 id="write-properties">Write properties<a class="headerlink" href="#write-properties" title="Permanent link">🔗</a></h3>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>write.format.default</td>
<td>parquet</td>
<td>Default file format for the table; parquet, avro, or orc</td>
</tr>
<tr>
<td>write.delete.format.default</td>
<td>data file format</td>
<td>Default delete file format for the table; parquet, avro, or orc</td>
</tr>
<tr>
<td>write.parquet.row-group-size-bytes</td>
<td>134217728 (128 MB)</td>
<td>Parquet row group size</td>
</tr>
<tr>
<td>write.parquet.page-size-bytes</td>
<td>1048576 (1 MB)</td>
<td>Parquet page size</td>
</tr>
<tr>
<td>write.parquet.page-row-limit</td>
<td>20000</td>
<td>Parquet page row limit</td>
</tr>
<tr>
<td>write.parquet.dict-size-bytes</td>
<td>2097152 (2 MB)</td>
<td>Parquet dictionary page size</td>
</tr>
<tr>
<td>write.parquet.compression-codec</td>
<td>zstd</td>
<td>Parquet compression codec: zstd, brotli, lz4, gzip, snappy, uncompressed</td>
</tr>
<tr>
<td>write.parquet.compression-level</td>
<td>null</td>
<td>Parquet compression level</td>
</tr>
<tr>
<td>write.parquet.bloom-filter-enabled.column.col1</td>
<td>(not set)</td>
<td>Hint to parquet to write a bloom filter for the column: col1</td>
</tr>
<tr>
<td>write.parquet.bloom-filter-max-bytes</td>
<td>1048576 (1 MB)</td>
<td>The maximum number of bytes for a bloom filter bitset</td>
</tr>
<tr>
<td>write.avro.compression-codec</td>
<td>gzip</td>
<td>Avro compression codec: gzip(deflate with 9 level), zstd, snappy, uncompressed</td>
</tr>
<tr>
<td>write.avro.compression-level</td>
<td>null</td>
<td>Avro compression level</td>
</tr>
<tr>
<td>write.orc.stripe-size-bytes</td>
<td>67108864 (64 MB)</td>
<td>Define the default ORC stripe size, in bytes</td>
</tr>
<tr>
<td>write.orc.block-size-bytes</td>
<td>268435456 (256 MB)</td>
<td>Define the default file system block size for ORC files</td>
</tr>
<tr>
<td>write.orc.compression-codec</td>
<td>zlib</td>
<td>ORC compression codec: zstd, lz4, lzo, zlib, snappy, none</td>
</tr>
<tr>
<td>write.orc.compression-strategy</td>
<td>speed</td>
<td>ORC compression strategy: speed, compression</td>
</tr>
<tr>
<td>write.orc.bloom.filter.columns</td>
<td>(not set)</td>
<td>Comma separated list of column names for which a Bloom filter must be created</td>
</tr>
<tr>
<td>write.orc.bloom.filter.fpp</td>
<td>0.05</td>
<td>False positive probability for Bloom filter (must &gt; 0.0 and &lt; 1.0)</td>
</tr>
<tr>
<td>write.location-provider.impl</td>
<td>null</td>
<td>Optional custom implementation for LocationProvider</td>
</tr>
<tr>
<td>write.metadata.compression-codec</td>
<td>none</td>
<td>Metadata compression codec; none or gzip</td>
</tr>
<tr>
<td>write.metadata.metrics.max-inferred-column-defaults</td>
<td>100</td>
<td>Defines the maximum number of columns for which metrics are collected</td>
</tr>
<tr>
<td>write.metadata.metrics.default</td>
<td>truncate(16)</td>
<td>Default metrics mode for all columns in the table; none, counts, truncate(length), or full</td>
</tr>
<tr>
<td>write.metadata.metrics.column.col1</td>
<td>(not set)</td>
<td>Metrics mode for column 'col1' to allow per-column tuning; none, counts, truncate(length), or full</td>
</tr>
<tr>
<td>write.target-file-size-bytes</td>
<td>536870912 (512 MB)</td>
<td>Controls the size of files generated to target about this many bytes</td>
</tr>
<tr>
<td>write.delete.target-file-size-bytes</td>
<td>67108864 (64 MB)</td>
<td>Controls the size of delete files generated to target about this many bytes</td>
</tr>
<tr>
<td>write.distribution-mode</td>
<td>none</td>
<td>Defines distribution of write data: <strong>none</strong>: don't shuffle rows; <strong>hash</strong>: hash distribute by partition key ; <strong>range</strong>: range distribute by partition key or sort key if table has an SortOrder</td>
</tr>
<tr>
<td>write.delete.distribution-mode</td>
<td>hash</td>
<td>Defines distribution of write delete data</td>
</tr>
<tr>
<td>write.update.distribution-mode</td>
<td>hash</td>
<td>Defines distribution of write update data</td>
</tr>
<tr>
<td>write.merge.distribution-mode</td>
<td>none</td>
<td>Defines distribution of write merge data</td>
</tr>
<tr>
<td>write.wap.enabled</td>
<td>false</td>
<td>Enables write-audit-publish writes</td>
</tr>
<tr>
<td>write.summary.partition-limit</td>
<td>0</td>
<td>Includes partition-level summary stats in snapshot summaries if the changed partition count is less than this limit</td>
</tr>
<tr>
<td>write.metadata.delete-after-commit.enabled</td>
<td>false</td>
<td>Controls whether to delete the oldest <strong>tracked</strong> version metadata files after commit</td>
</tr>
<tr>
<td>write.metadata.previous-versions-max</td>
<td>100</td>
<td>The max number of previous version metadata files to keep before deleting after commit</td>
</tr>
<tr>
<td>write.spark.fanout.enabled</td>
<td>false</td>
<td>Enables the fanout writer in Spark that does not require data to be clustered; uses more memory</td>
</tr>
<tr>
<td>write.object-storage.enabled</td>
<td>false</td>
<td>Enables the object storage location provider that adds a hash component to file paths</td>
</tr>
<tr>
<td>write.data.path</td>
<td>table location + /data</td>
<td>Base location for data files</td>
</tr>
<tr>
<td>write.metadata.path</td>
<td>table location + /metadata</td>
<td>Base location for metadata files</td>
</tr>
<tr>
<td>write.delete.mode</td>
<td>copy-on-write</td>
<td>Mode used for delete commands: copy-on-write or merge-on-read (v2 only)</td>
</tr>
<tr>
<td>write.delete.isolation-level</td>
<td>serializable</td>
<td>Isolation level for delete commands: serializable or snapshot</td>
</tr>
<tr>
<td>write.update.mode</td>
<td>copy-on-write</td>
<td>Mode used for update commands: copy-on-write or merge-on-read (v2 only)</td>
</tr>
<tr>
<td>write.update.isolation-level</td>
<td>serializable</td>
<td>Isolation level for update commands: serializable or snapshot</td>
</tr>
<tr>
<td>write.merge.mode</td>
<td>copy-on-write</td>
<td>Mode used for merge commands: copy-on-write or merge-on-read (v2 only)</td>
</tr>
<tr>
<td>write.merge.isolation-level</td>
<td>serializable</td>
<td>Isolation level for merge commands: serializable or snapshot</td>
</tr>
</tbody>
</table>
<h3 id="table-behavior-properties">Table behavior properties<a class="headerlink" href="#table-behavior-properties" title="Permanent link">🔗</a></h3>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>commit.retry.num-retries</td>
<td>4</td>
<td>Number of times to retry a commit before failing</td>
</tr>
<tr>
<td>commit.retry.min-wait-ms</td>
<td>100</td>
<td>Minimum time in milliseconds to wait before retrying a commit</td>
</tr>
<tr>
<td>commit.retry.max-wait-ms</td>
<td>60000 (1 min)</td>
<td>Maximum time in milliseconds to wait before retrying a commit</td>
</tr>
<tr>
<td>commit.retry.total-timeout-ms</td>
<td>1800000 (30 min)</td>
<td>Total retry timeout period in milliseconds for a commit</td>
</tr>
<tr>
<td>commit.status-check.num-retries</td>
<td>3</td>
<td>Number of times to check whether a commit succeeded after a connection is lost before failing due to an unknown commit state</td>
</tr>
<tr>
<td>commit.status-check.min-wait-ms</td>
<td>1000 (1s)</td>
<td>Minimum time in milliseconds to wait before retrying a status-check</td>
</tr>
<tr>
<td>commit.status-check.max-wait-ms</td>
<td>60000 (1 min)</td>
<td>Maximum time in milliseconds to wait before retrying a status-check</td>
</tr>
<tr>
<td>commit.status-check.total-timeout-ms</td>
<td>1800000 (30 min)</td>
<td>Total timeout period in which the commit status-check must succeed, in milliseconds</td>
</tr>
<tr>
<td>commit.manifest.target-size-bytes</td>
<td>8388608 (8 MB)</td>
<td>Target size when merging manifest files</td>
</tr>
<tr>
<td>commit.manifest.min-count-to-merge</td>
<td>100</td>
<td>Minimum number of manifests to accumulate before merging</td>
</tr>
<tr>
<td>commit.manifest-merge.enabled</td>
<td>true</td>
<td>Controls whether to automatically merge manifests on writes</td>
</tr>
<tr>
<td>history.expire.max-snapshot-age-ms</td>
<td>432000000 (5 days)</td>
<td>Default max age of snapshots to keep on the table and all of its branches while expiring snapshots</td>
</tr>
<tr>
<td>history.expire.min-snapshots-to-keep</td>
<td>1</td>
<td>Default min number of snapshots to keep on the table and all of its branches while expiring snapshots</td>
</tr>
<tr>
<td>history.expire.max-ref-age-ms</td>
<td><code>Long.MAX_VALUE</code> (forever)</td>
<td>For snapshot references except the <code>main</code> branch, default max age of snapshot references to keep while expiring snapshots. The <code>main</code> branch never expires.</td>
</tr>
</tbody>
</table>
<h3 id="reserved-table-properties">Reserved table properties<a class="headerlink" href="#reserved-table-properties" title="Permanent link">🔗</a></h3>
<p>Reserved table properties are only used to control behaviors when creating or updating a table.
The value of these properties are not persisted as a part of the table metadata.</p>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>format-version</td>
<td>2</td>
<td>Table's format version (can be 1 or 2) as defined in the <a href="../../../spec/#format-versioning">Spec</a>. Defaults to 2 since version 1.4.0.</td>
</tr>
</tbody>
</table>
<h3 id="compatibility-flags">Compatibility flags<a class="headerlink" href="#compatibility-flags" title="Permanent link">🔗</a></h3>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>compatibility.snapshot-id-inheritance.enabled</td>
<td>false</td>
<td>Enables committing snapshots without explicit snapshot IDs (always true if the format version is &gt; 1)</td>
</tr>
</tbody>
</table>
<h2 id="catalog-properties">Catalog properties<a class="headerlink" href="#catalog-properties" title="Permanent link">🔗</a></h2>
<p>Iceberg catalogs support using catalog properties to configure catalog behaviors. Here is a list of commonly used catalog properties:</p>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>catalog-impl</td>
<td>null</td>
<td>a custom <code>Catalog</code> implementation to use by an engine</td>
</tr>
<tr>
<td>io-impl</td>
<td>null</td>
<td>a custom <code>FileIO</code> implementation to use in a catalog</td>
</tr>
<tr>
<td>warehouse</td>
<td>null</td>
<td>the root path of the data warehouse</td>
</tr>
<tr>
<td>uri</td>
<td>null</td>
<td>a URI string, such as Hive metastore URI</td>
</tr>
<tr>
<td>clients</td>
<td>2</td>
<td>client pool size</td>
</tr>
<tr>
<td>cache-enabled</td>
<td>true</td>
<td>Whether to cache catalog entries</td>
</tr>
<tr>
<td>cache.expiration-interval-ms</td>
<td>30000</td>
<td>How long catalog entries are locally cached, in milliseconds; 0 disables caching, negative values disable expiration</td>
</tr>
<tr>
<td>metrics-reporter-impl</td>
<td>org.apache.iceberg.metrics.LoggingMetricsReporter</td>
<td>Custom <code>MetricsReporter</code> implementation to use in a catalog. See the <a href="../../metrics-reporting/">Metrics reporting</a> section for additional details</td>
</tr>
</tbody>
</table>
<p><code>HadoopCatalog</code> and <code>HiveCatalog</code> can access the properties in their constructors.
Any other custom catalog can access the properties by implementing <code>Catalog.initialize(catalogName, catalogProperties)</code>.
The properties can be manually constructed or passed in from a compute engine like Spark or Flink.
Spark uses its session properties as catalog properties, see more details in the <a href="../spark-configuration/#catalog-configuration">Spark configuration</a> section.
Flink passes in catalog properties through <code>CREATE CATALOG</code> statement, see more details in the <a href="../flink/#adding-catalogs">Flink</a> section.</p>
<h3 id="lock-catalog-properties">Lock catalog properties<a class="headerlink" href="#lock-catalog-properties" title="Permanent link">🔗</a></h3>
<p>Here are the catalog properties related to locking. They are used by some catalog implementations to control the locking behavior during commits.</p>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>lock-impl</td>
<td>null</td>
<td>a custom implementation of the lock manager, the actual interface depends on the catalog used</td>
</tr>
<tr>
<td>lock.table</td>
<td>null</td>
<td>an auxiliary table for locking, such as in <a href="../aws/#dynamodb-lock-manager">AWS DynamoDB lock manager</a></td>
</tr>
<tr>
<td>lock.acquire-interval-ms</td>
<td>5000 (5 s)</td>
<td>the interval to wait between each attempt to acquire a lock</td>
</tr>
<tr>
<td>lock.acquire-timeout-ms</td>
<td>180000 (3 min)</td>
<td>the maximum time to try acquiring a lock</td>
</tr>
<tr>
<td>lock.heartbeat-interval-ms</td>
<td>3000 (3 s)</td>
<td>the interval to wait between each heartbeat after acquiring a lock</td>
</tr>
<tr>
<td>lock.heartbeat-timeout-ms</td>
<td>15000 (15 s)</td>
<td>the maximum time without a heartbeat to consider a lock expired</td>
</tr>
</tbody>
</table>
<h2 id="hadoop-configuration">Hadoop configuration<a class="headerlink" href="#hadoop-configuration" title="Permanent link">🔗</a></h2>
<p>The following properties from the Hadoop configuration are used by the Hive Metastore connector.
The HMS table locking is a 2-step process:</p>
<ol>
<li>Lock Creation: Create lock in HMS and queue for acquisition</li>
<li>Lock Check: Check if lock successfully acquired</li>
</ol>
<table>
<thead>
<tr>
<th>Property</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>iceberg.hive.client-pool-size</td>
<td>5</td>
<td>The size of the Hive client pool when tracking tables in HMS</td>
</tr>
<tr>
<td>iceberg.hive.lock-creation-timeout-ms</td>
<td>180000 (3 min)</td>
<td>Maximum time in milliseconds to create a lock in the HMS</td>
</tr>
<tr>
<td>iceberg.hive.lock-creation-min-wait-ms</td>
<td>50</td>
<td>Minimum time in milliseconds between retries of creating the lock in the HMS</td>
</tr>
<tr>
<td>iceberg.hive.lock-creation-max-wait-ms</td>
<td>5000</td>
<td>Maximum time in milliseconds between retries of creating the lock in the HMS</td>
</tr>
<tr>
<td>iceberg.hive.lock-timeout-ms</td>
<td>180000 (3 min)</td>
<td>Maximum time in milliseconds to acquire a lock</td>
</tr>
<tr>
<td>iceberg.hive.lock-check-min-wait-ms</td>
<td>50</td>
<td>Minimum time in milliseconds between checking the acquisition of the lock</td>
</tr>
<tr>
<td>iceberg.hive.lock-check-max-wait-ms</td>
<td>5000</td>
<td>Maximum time in milliseconds between checking the acquisition of the lock</td>
</tr>
<tr>
<td>iceberg.hive.lock-heartbeat-interval-ms</td>
<td>240000 (4 min)</td>
<td>The heartbeat interval for the HMS locks.</td>
</tr>
<tr>
<td>iceberg.hive.metadata-refresh-max-retries</td>
<td>2</td>
<td>Maximum number of retries when the metadata file is missing</td>
</tr>
<tr>
<td>iceberg.hive.table-level-lock-evict-ms</td>
<td>600000 (10 min)</td>
<td>The timeout for the JVM table lock is</td>
</tr>
<tr>
<td>iceberg.engine.hive.lock-enabled</td>
<td>true</td>
<td>Use HMS locks to ensure atomicity of commits</td>
</tr>
</tbody>
</table>
<p>Note: <code>iceberg.hive.lock-check-max-wait-ms</code> and <code>iceberg.hive.lock-heartbeat-interval-ms</code> should be less than the <a href="https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.txn.timeout">transaction timeout</a>
of the Hive Metastore (<code>hive.txn.timeout</code> or <code>metastore.txn.timeout</code> in the newer versions). Otherwise, the heartbeats on the lock (which happens during the lock checks) would end up expiring in the
Hive Metastore before the lock is retried from Iceberg.</p>
<p>Warn: Setting <code>iceberg.engine.hive.lock-enabled</code>=<code>false</code> will cause HiveCatalog to commit to tables without using Hive locks.
This should only be set to <code>false</code> if all following conditions are met:</p>
<ul>
<li><a href="https://issues.apache.org/jira/browse/HIVE-26882">HIVE-26882</a>
is available on the Hive Metastore server</li>
<li>All other HiveCatalogs committing to tables that this HiveCatalog commits to are also on Iceberg 1.3 or later</li>
<li>All other HiveCatalogs committing to tables that this HiveCatalog commits to have also disabled Hive locks on commit.</li>
</ul>
<p><strong>Failing to ensure these conditions risks corrupting the table.</strong></p>
<p>Even with <code>iceberg.engine.hive.lock-enabled</code> set to <code>false</code>, a HiveCatalog can still use locks for individual tables by setting the table property <code>engine.hive.lock-enabled</code>=<code>true</code>.
This is useful in the case where other HiveCatalogs cannot be upgraded and set to commit without using Hive locks.</p>
</article>
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