Skip to content

Latest commit

 

History

History
364 lines (303 loc) · 46.1 KB

table.md

File metadata and controls

364 lines (303 loc) · 46.1 KB
description
The tables below shows the properties available to set at the table level.

Table

Top-level fields

Property Description
tableName Specifies the name of the table. Should only contain alpha-numeric characters, hyphens (‘-‘), or underscores (‘_’). (Two notes: While the hyphen is allowed in table names, it is also a reserved character in SQL, so if you use it you must remember to double quote the table name in your queries. Using a double-underscore (‘__’) is not allowed as it is reserved for other features within Pinot.)
tableType Defines the table type: OFFLINE for offline tables or REALTIME for real-time tables. A hybrid table is essentially two table configurations: one of each type, with the same table name.
isDimTable Boolean field to indicate whether the table is a dimension table.
quota Defines properties related to quotas, such as storage quota and query quota. For details, see the Quota table below.
task Defines the enabled minion tasks for the table. See Minion for more details.
routing Defines the properties that determine how the broker selects the servers to route, and how segments can be pruned by the broker based on segment metadata. For details, see the Routing table below.
query Defines the properties related to query execution. For details, see the Query table below.
segmentsConfig Defines the properties related to the segments of the table, such as segment push frequency, type, retention, schema, time column etc. For details, see the segmentsConfig table below.
tableIndexConfig Defines the indexing related information for the Pinot table. For details, see Table indexing config below.
fieldConfigList Specifies the columns and the type of indices to be created on those columns. See Field config list for sub-properties.
tenants Defines the server and broker tenant used for this table. For details, see Tenant below.
ingestionConfig Defines the properties related to ingesting data. See the ingestionConfig section for details.
upsertConfig Set upset configurations. For details, see Stream ingestion with upsert.
dedupConfig Set deduplication configurations. For details, see Stream ingestion with Dedup.
dimensionTableConfig Set disablePreload to true to save memory if the table is a dimension table.
tierConfigs Defines configurations for tiered storage. For details, see Tiered Storage.
metadata Contains other metadata of the table. There is a string to string map field "customConfigs" under it which is expressed as key-value pairs to hold the custom configurations.

Second-level fields

The following properties can be nested inside the top-level configurations.

Quota

Property Description
storage

The maximum storage space the table is allowed to use before replication.

For example, in the above table, the storage is 140G and replication is 3, so the maximum storage the table is allowed to use is 140G x 3 = 420G. The space the table uses is calculated by adding up the sizes of all segments from every server hosting this table. Once this limit is reached, offline segment push throws a 403 exception with message, Quota check failed for segment: segment_0 of table: pinotTable.
maxQueriesPerSecond The maximum queries per second allowed to execute on this table. If query volume exceeds this, a 429 exception with message Request 123 exceeds query quota for table:pinotTable, query:select count(*) from pinotTable will be sent, and a BrokerMetric QUERY_QUOTA_EXCEEDED will be recorded. The application should build an exponential backoff and retry mechanism to react to this exception.

Find more details on query quotas here

Routing

Find details on configuring routing here.

Property Description
segmentPrunerTypes

The list of segment pruners to be enabled.

The segment pruner prunes the selected segments based on the query.

Supported values:

  • partition: Prunes segments based on the partition metadata stored in zookeeper. By default, there is no pruner.
  • time: Prune segments for queries filtering on timeColumnName that do not contain data in the query's time range.
instanceSelectorType

The server instances to serve the query based on selected segments. Supported values:

  • balanced: Balances the number of segments served by each selected instance. Default.
  • replicaGroup: Instance selector for replica group routing strategy.

Query

Property Description
timeoutMs Query timeout in milliseconds
disableGroovy Whether to disable groovy in query. This overrides the broker instance level config (pinot.broker.disable.query.groovy) if configured.
useApproximateFunction Whether to automatically use approximate function for expensive aggregates, such as DISTINCT_COUNT OR DISTINCT_COUNT_MV will be converted to DISTINCT_COUNT_SMARTHLL and PERCENTILE to PERCENTILE_SMART_TDIGEST .This overrides the broker instance level config (pinot.broker.use.approximate.function) if configured.
expressionOverrideMap A map that configures the expressions to override in the query. This can be useful when users cannot control the queries sent to Pinot (e.g. queries auto-generated by some other tools), but want to override the expressions within the query (e.g. override a transform function to a derived column). Example: {"myFunc(a)": "b"}.
maxQueryResponseSizeBytes Long value config indicating the maximum serialized response size across all servers for a query. This value is // equally divided across all servers processing the query.
maxServerResponseSizeBytes Long value config indicating the maximum length of the serialized response per server for a query.

Segments config

Property Description
schemaName

Deprecated: schema name should always match the table name (without the type suffix, e.g. myTable), and this field should not be configured.

Name of the schema associated with the table
timeColumnName The name of the time column for this table. This must match with the time column name in the schema. This is mandatory for tables with push type APPEND, optional for REFRESH. timeColumnName along with timeColumnType is used to manage segment retention and time boundary for offline vs real-time.
replication Number of replicas for the tables. A replication value of 1 means segments won't be replicated across servers.
retentionTimeUnit

Unit for the retention, such as HOURS or DAYS. This, in combination with retentionTimeValue decides the duration for which to retain the segments.

For example, 365 DAYS means that segments containing data older than 365 days will be deleted periodically by the RetentionManager Controller periodic task. By default, there is no set retention.
retentionTimeValue A numeric value for the retention. This, in combination with retentionTimeUnit, determines the duration for which to retain the segments

Table index config

This section is used to specify some general index configuration and multi-column indexes like Star-tree.

{% hint style="info" %} Before Pinot version 0.13, the configuration described above was also used to configure certain single-column indexes. While this approach is still supported, it is highly recommended to specify these indexes in the [Field Config List](#Field Config List) section instead. The documentation page for each index type provides guidance on how to utilize this section to create that specific index type. This updated method offers more flexibility and aligns with best practices for configuring single-column indexes in Pinot. {% endhint %}

Property Description
createInvertedIndexDuringSegmentGeneration Boolean to indicate whether to create inverted indexes when segments are created. By default, false, which means indexes are created when the segments are loaded on the server. Learn more about this setting in advanced Pinot setup.
sortedColumn The column which is sorted in the data and hence will have a sorted index. This does not need to be specified for the offline table, as the segment generation job will automatically detect the sorted column in the data and create a sorted index for it.
starTreeIndexConfigs The list of StarTree indexing configs for creating StarTree indexes. For details on how to configure this, see StarTree Index.
enableDefaultStarTree Boolean to indicate whether to create a default StarTree index for the segment. For details, see Star-Tree index.
enableDynamicStarTreeCreation Boolean to indicate whether to allow creating StarTree when server loads the segment. StarTree creation could potentially consume a lot of system resources, so this config should be enabled when the servers have the free system resources to create the StarTree.
segmentPartitionConfig

Use segmentPartitionConfig.columnPartitionMap along with routing.segementPrunerTypes to enable partitioning. For each column, configure the following options:

  • functionName: Specify one of the supported functions:

    • Murmur:MurmurHash 2
    • Modulo: Modulo on integer values
    • HashCode: Java hashCode()
    • ByteArray: Java hashCode() on deserialized byte array
  • numPartitions: Number of partitions you want per segment. Controls how data is divided within each segment.

Example:
{

"columnPartitionMap": {
"column_memberID": {
"functionName": "Murmur",
"numPartitions": 32
}
}
loadMode

Indicates how the segments will be loaded onto the server:
heap - load data directly into direct memory
mmap - load data segments to off-heap memory
columnMinMaxValueGeneratorMode

Generate min max values for columns. Supported values:
NONE - do not generate for any columns
ALL - generate for all columns
TIME - generate for only time column
NON_METRIC - generate for time and dimension columns
nullHandlingEnabled (deprecated, use enableColumnBasedNullHandling in schema) For more information, see the null handling section.
aggregateMetrics (deprecated, use Ingestion Aggregation) (only applicable for stream) set to true to pre-aggregate the metrics
optimizeDictionary Set to true if you want to disable dictionaries for single valued metric columns. Only applicable to single-valued columns. Applies other modifications to dictionary indexes. Read their documentation page to get more info. Defaults to false.
optimizeDictionaryForMetrics Set to true if you want to disable dictionaries for single valued metric columns. Only applicable to single-valued metric columns. Defaults to false
noDictionarySizeRatioThreshold

If optimizeDictionaryForMetrics enabled, dictionary is not created for the metric columns for which noDictionaryIndexSize/ indexWithDictionarySize is less than the noDictionarySizeRatioThreshold
Default: 0.85
segmentNameGeneratorType

Type of segmentNameGenerator, default is SimpleSegmentNameGenerator.

See more on #segment-name-generator-spec

Field Config List

Specify the columns and the type of indices to be created on those columns.

Property
name Name of the column
encodingType Should be one of RAW or DICTIONARY
indexes An object whose keys identify indexes. Values are interpreted as the configuration for each index. See each index section to learn more about them
timestampConfig An object that defines the granularities used in timestamp indexes
properties JSON of key-value pairs containing additional properties associated with the index.

Deprecated configuration options

There are several deprecated configuration options in Pinot that are still supported but recommended for migration to newer ways of configuration. Here's a summary of these options:

indexTypes

indexType

  • Description: Similar to indexTypes, but only supports a single index type as a string.
  • Note: If both indexTypes and indexType are present, the latter is ignored.

compressionCodec

  • Description: An older way to specify compression for indexes.
  • Recommendation: It's now recommended to specify compression in the forward index config.

Deprecated properties

  • Description: Before Pinot 0.13, certain indexes were configured using properties within this section.
  • Migration: Since Pinot 0.13, each index can be configured in a type-safe manner within its dedicated section in the indexes object. The documentation for each index type lists the properties that were previously used.
  • Notable Properties:
    • Text Index Properties: enableQueryCacheForTextIndex (used to enable/disable the cache, with values specified as strings, e.g., "true" or "false").
    • Forward Index Properties: rawIndexWriterVersion, deriveNumDocsPerChunkForRawIndex, forwardIndexDisabled.

It's strongly recommended to migrate from these deprecated options to the new, more structured configuration methods introduced in Pinot 0.13 for better maintainability and compatibility.

{% hint style="danger" %} Warning:

If removing the forwardIndexDisabled property above to regenerate the forward index for multi-value (MV) columns note that the following invariants cannot be maintained after regenerating the forward index for a forward index disabled column:

  • Ordering guarantees of the MV values within a row
  • If entries within an MV row are duplicated, the duplicates will be lost. Regenerate the segments via your offline jobs and re-push / refresh the data to get back the original MV data with duplicates.

We will work on removing the second invariant in the future. {% endhint %}

Real-time table config

The sections below apply to real-time tables only.

segmentsConfig

Property Description
replicasPerPartition (Deprecated, use replication) The number of replicas per partition for the stream
completionMode determines if segment should be downloaded from other server or built in memory. can be DOWNLOAD or empty
peerSegmentDownloadScheme protocol to use to download segments from server. can be on of http or https

Indexing config

The streamConfigs section has been deprecated as of release 0.7.0. See streamConfigMaps instead.

Tenants

Property Description
broker Broker tenant in which the segment should reside
server Server tenant in which the segment should reside
tagOverrideConfig Override the tenant for segment if it fulfills certain conditions. Currently, only support override on realtimeConsuming or realtimeCompleted

Example

  "broker": "brokerTenantName",
  "server": "serverTenantName",
  "tagOverrideConfig" : {
    "realtimeConsuming" : "serverTenantName_REALTIME"
    "realtimeCompleted" : "serverTenantName_OFFLINE"
  }
}

Environment variables override

Pinot allows users to define environment variables in the format of ${ENV_NAME} or ${ENV_NAME:DEFAULT_VALUE}as field values in table config.

Pinot instance will override it during runtime.

{% hint style="warning" %} Brackets are required when defining the environment variable."$ENV_NAME"is not supported. {% endhint %}

{% hint style="warning" %} Environment variables used without default value in table config have to be available to all Pinot components - Controller, Broker, Server, and Minion. Otherwise, querying/consumption will be affected depending on the service to which these variables are not available. {% endhint %}

Below is an example of setting AWS credential as part of table config using environment variable.

Example:

{
...
  "ingestionConfig": {
    "batchIngestionConfig": {
      "segmentIngestionType": "APPEND",
      "segmentIngestionFrequency": "DAILY",
      "batchConfigMaps": [
        {
          "inputDirURI": "s3://<my-bucket>/baseballStats/rawdata",
          "includeFileNamePattern": "glob:**/*.csv",
          "excludeFileNamePattern": "glob:**/*.tmp",
          "inputFormat": "csv",
          "outputDirURI": "s3://<my-bucket>/baseballStats/segments",
          "input.fs.className": "org.apache.pinot.plugin.filesystem.S3PinotFS",
          "input.fs.prop.region": "us-west-2",
          "input.fs.prop.accessKey": "${AWS_ACCESS_KEY}",
          "input.fs.prop.secretKey": "${AWS_SECRET_KEY}",
          "push.mode": "tar"
        }
      ],
      "segmentNameSpec": {},
      "pushSpec": {}
    }
  },
...
}

Sample configurations

Offline table

{% code title="pinot-table-offline.json" %}

"OFFLINE": {
  "tableName": "pinotTable",
  "tableType": "OFFLINE",
  "quota": {
    "maxQueriesPerSecond": 300,
    "storage": "140G"
  },
  "routing": {
    "segmentPrunerTypes": ["partition"],
    "instanceSelectorType": "replicaGroup"
  },
  "segmentsConfig": {
    "timeColumnName": "daysSinceEpoch",
    "timeType": "DAYS",
    "replication": "3",
    "retentionTimeUnit": "DAYS",
    "retentionTimeValue": "365",
    "segmentPushFrequency": "DAILY",
    "segmentPushType": "APPEND"
  },
  "tableIndexConfig": {
    "invertedIndexColumns": ["foo", "bar", "moo"],
    "createInvertedIndexDuringSegmentGeneration": false,
    "sortedColumn": ["pk"],
    "bloomFilterColumns": [],
    "starTreeIndexConfigs": [],
    "noDictionaryColumns": [],
    "rangeIndexColumns": [],
    "onHeapDictionaryColumns": [],
    "varLengthDictionaryColumns": [],
    "segmentPartitionConfig": {
      "columnPartitionMap": {
        "column_foo": {
          "functionName": "Murmur",
          "numPartitions": 32
        }
      }
    },
    "loadMode": "MMAP",
    "columnMinMaxValueGeneratorMode": null,
    "nullHandlingEnabled": false
  },
  "ingestionConfig": {
    "filterConfig": {
      "filterFunction": "Groovy({foo == \"VALUE1\"}, foo)"
    },
    "transformConfigs": [
    {
      "columnName": "bar",
      "transformFunction": "lower(moo)"
    },
    {
      "columnName": "hoursSinceEpoch",
      "transformFunction": "toEpochHours(millis)"
    }]
  },
  "tenants": {
    "broker": "myBrokerTenant",
    "server": "myServerTenant"
  },
  "metadata": {
    "customConfigs": {
      "key": "value",
      "key": "value"
    }
  }
}

{% endcode %}

Real-time table

Here's an example table config for a real-time table. All the fields from the offline table config are valid for the real-time table. Additionally, real-time tables use some extra fields.

{% code title="pinot-table-realtime.json" %}

"REALTIME": {
  "tableName": "pinotTable",
  "tableType": "REALTIME",
  "segmentsConfig": {
    "timeColumnName": "daysSinceEpoch",
    "timeType": "DAYS",
    "replication": "3",
    "retentionTimeUnit": "DAYS",
    "retentionTimeValue": "5",
    "completionConfig": {
      "completionMode": "DOWNLOAD"
    }
  },
  "tableIndexConfig": {
    "invertedIndexColumns": ["foo", "bar", "moo"],
    "sortedColumn": ["column1"],
    "noDictionaryColumns": ["metric1", "metric2"],
    "loadMode": "MMAP",
    "nullHandlingEnabled": false
  },
  "ingestionConfig:" {
    "streamIngestionConfig": {
      "streamConfigMaps": [
      {
        "realtime.segment.flush.threshold.rows": "0",
        "realtime.segment.flush.threshold.time": "24h",
        "realtime.segment.flush.threshold.segment.size": "150M",
        "stream.kafka.broker.list": "XXXX",
        "stream.kafka.consumer.factory.class.name": "XXXX",
        "stream.kafka.consumer.prop.auto.offset.reset": "largest",
        "stream.kafka.consumer.type": "XXXX",
        "stream.kafka.decoder.class.name": "XXXX",
        "stream.kafka.decoder.prop.schema.registry.rest.url": "XXXX",
        "stream.kafka.decoder.prop.schema.registry.schema.name": "XXXX",
        "stream.kafka.hlc.zk.connect.string": "XXXX",
        "stream.kafka.topic.name": "XXXX",
        "stream.kafka.zk.broker.url": "XXXX",
        "streamType": "kafka"
      }]
    }
  },
  "tenants":{
    "broker": "myBrokerTenant",
    "server": "myServerTenant",
    "tagOverrideConfig": {}
  },
  "metadata": {}
}

{% endcode %}