General Information about Custom Properties

INFO

A custom property consists of a name (key) and a value pair, separated by a "=".

Example: 'das.job.health.check=true'

List of DAS Properties

INFO

Set up the custom properties in the '/conf' folder within your Datameer X instance.

execution related properties - define parameters for a job that Datameer X sends to the cluster, e.g. container memory, split size.
conductor related properties - define the application behavior, e.g. proxy settings, preview size, thread pool.

Name	Default Value	Description
Execution Related Properties
das.io.compression.codecs.addition	datameer.dap.common.util.ZipCodec	Additional compression codecs that are added to io.compression.codecs
das.error.log.max-entries	-1 (unlimited)	The maximum number of errors that should be written per MR task.
das.error.log.replication-factor	1	The replication factor for the error-logs which are getting written for dropped records.
das.join.deferred-file.memory-threshold	52428800 (50MB)	Maximum size of memory which is used to cache values before falling back to file. This property is used in self joins and from the join strategies REDUCE_SIDE and PRE_SORT_MAP_SIDE.
das.join.map-side.memory.max-file-size	15728640 (15MB)	Maximum size for the smaller join file of a join. Datameer X uses different join strategies. The fastest join strategy is when one input of the two fits into memory. This property marks the upper bound when a file, depending on its size, is assumed to fit into memory. Note that depending on compression and record-structure a 15 MB file on disk can easily blow up to 500 MB in memory.
das.join.disabled-strategies	empty	A comma separated list of Join strategies which should explicitly not be used. Available are MEMORY_BACKED_MAP_SIDE, REDUCE_SIDE and PRE_SORT_MAP_SIDE.
das.jdbc.import.transaction-isolation	TRANSACTION_READ_COMMITTED	The jdbc transaction-level which should be used for imports from database. You can choose between TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ and TRANSACTION_SERIALIZABLE which corresponds to the transaction-isolation levels from java.sql.Connection.
das.job.trigger.type		Tells who/what triggered a job. (USER, SCHEDULER, RESTAPI, IMPORTJOB, EXPORTJOB, WORKBOOK).
das.job.hdfs.ownership		The name of the owner for each file and folder that will be created during a job run in HDFS.
das.job.hdfs.groupname		The name of the group for each file and folder that will be created during a job run in HDFS.
das.job.execution.username		The name of the user thats executes the job.
das.job.configuration.owner.username		The name of the user thats the owns the configuration of the job.
das.debug.tasks.logs.collect.max	20	Number of task-logs which getting copied into job-artifacts folder when job completes.
das.debug.tasks.logs.collect.force	false	When true, copies the task-logs into job-artifacts folder even when job completes successfully.
das.splitting.max-split-count		Datameer X merges multiple small files into combined splits and splits large files into multiple smaller splits. Setting this property can control the maximum number of splits that should be created. This is good to reduce the number of file handlers due to a lack of RPC resources.
das.splitting.min-split-count		Sets the minimum number of splits that should be created. This could be used in increase the number of map-tasks for smaller jobs to better utilize the cluster.
das.jdbc.records.per.commit	50	Sets the JDBC batch size for export jobs. Helpful on debugging export issues during JDBC batch commit.
das.debug.job	false	Shortcut property for enabling a set of debug related properties for map-reduce jobs like periodic thread-dumps, periodic counter dumps, task-log retrieval, etc..
das.debug.periodic-thread-dumps-period	(-1=disabled, >0 enabled)	A thread dump is taken every x ms and logged to stdout (so it ends in the task-logs).
das.debug.periodic-counter-dumps-period	(-1=disabled, >0 enabled)	A hadoop-counter dump is taken every x ms and logged to stdout (so it ends in the task-logs).
das.sampling.lookahead.maxdepth	5	Smart sampling uses information from the downstream sheets in a workbook while sampling data for the preview of a sheet. This parameter sets the number of downstream levels which are considered.
das.map-tasks-per-node	10	Set the number of map tasks per node.
das.reduce-tasks-per-node	7	Set the number of reduce tasks per node.
das.job.reduce .tasks.correct	true	If the reducer count should be adapted based on the split-count (map-task count).
das.job.concurrent-mr-jobs.new-graph-api	5	Only for new graph API: The maximum number of MR jobs that can run concurrently for each Datameer X job.
das.aggregation.map-cache-size	ByteUnit.MB.toBytes(16)	Size of Cache for Map-Side Aggregation in bytes. Less than or equal to 0 means disable Map-Side Aggregation.
das.debug.job-metadata	enabled	Possible values are these from the enum JobMetaDataMode (ENABLED, DISABLED, DEFLATED)
das.debug.job.report-progress-interval	-1	Interval in milliseconds a reporting thread will report progress to hadoop's tasktracker. If set to <= 0 no thread will be installed and progress is reported by mappers, reducers, readers, etc... as usual.
das.jobconf .cache-properties	Properties like " das.plugin-registry.conf,map-runnable,reducer,mapred.input.dir"	Properties are evacuated to the distributed cache. Evacuation means, before submitting the job, the properties are stripped out of the job-conf and written into one file in the distributed cache. On a task side, before any serious work happens, the properties are read from the distributed cache and added to the job-conf. Disable the whole mechanism by setting ' das.jobconf .cache-properties' to ''.
das.job.map -task.memory	2048
das.job.reduce -task.memory	2048
das.job.application-manager.memory	2048
das.job.reduce .tasks	-1	{@link datameer.dap.sdk.util.HadoopConstants.MAPRED#REDUCE_TASKS} is calculated dynamically. If for any reason you want to enforce a specific reduce count, set this property to greater then zero.
das.error.log.replication-factor	2	The replication factor for the error-logs which are getting written for dropped records.
das.splitting.map-wave-count	3	The map-wave-count to influence the number of map-task DAS uses for internal and for file-based import jobs.
das.splitting.map-slots.safety-factor	1	The number of map-slots which isn't used for the last map-wave in order to absorb node-failures.
das.splitting.disable-combining	false	Determines how splitting occurs. Setting the value to true ensures that a files are not split based on blocks.
das.splitting.disable-individual-file-splitting	false	Determines how splitting occurs for an individual file. Setting the value to true ensures that a single file isn't split based on its blocks.
das.splitting.max-rewind-count	1024 * 1024 * 10	For support of {@link MultipleSourceRecordParser}. Determines the number of bytes a middle-split is rewinded at the maximum in case the split doesn't start with a valid raw-record.
das.splitting.max-split-count		Datameer X merges multiple small files into combined splits and splits large files into multiple smaller splits. Setting this property can control the maximum number of splits that should be created. This is good to reduce the number of file handlers due to a lack of RPC resources.
das.splitting.non-splittable-encodings	UTF-16, UTF-16BE, UTF-16LE	Lists the file encodings for which splitting is restricted to only file level. For example, a file with this kind of encoding is not split at the block level.
das.join.deferred-file.memory-threshold	52428800	Maximum size of memory which is used to cache values during join before falling back to file. 50 MB default.
das.join.map-side.memory.max-uncompressed-file-size	31457280
das.join.map-side.memory.max-file-size	10485760
das.join.disabled-strategies
das.range-join.map-side.max-uncompressed-file-size	31457280	Max uncompressed file size the file can have that we attempt to load into memory for a map-side range join.
das.range-join.map-side.max-records	10000	Max number of records the file can have that we attempt to load into memory for a map-side range join.
das.range-join.reduce-side.max-reducers	-1	Max number of reducers to use for reduce-side range join implementation, -1 mean determine based on input sizing.
das.range-join.reduce-side.min-bytes-per-reducer	536870912	Minimum number of bytes each reducer should see, used by auto reducer count algorithm to help determine the number of reducers.
das.range-join.reduce-side.volume-weighting-factor	0.7	Factor to control weighting of the reducer data volume when determining the number of reducers for the reduce-side range join.
das.cluster.hadoop.fs.cache.scheme.whitelist	scp,sftp	Allows using the Hadoop FileServer cache on the cluster; with the FileServer cache enabled for SCP/ SFTP scheme, there will be a single SSH connection for each 'das.cluster.hadoop.fs.cache.scheme.whitelist=scp,sftp'.
das.import.parquet.int96.timestamp.adjusted-to-utc das.import.parquet.int64.timestamp.adjusted-to-utc	true	Timezone control for importing timestamps from Parquet. true: timezone values in Parquet files have been adjusted to UTC false: timezone values in Parquet have NOT been adjusted to UTC and assumed timezone will be controlled by `system.property.das.default-timezone` value in default.properties config file
das-conductor.properties
das.preview.expression.records.max	100	Maximum array size that a function may return for previews. If this value is exceeded the excess records are chopped off. This is only used on the Datameer X server to keep the previews small.
das.big-decimal.precision	32	During data ingestion, data field types of big integer and big decimal have the maximum precision rounded to this value.
das.expression.records.max	Integer.MAX_VALUE	Maximum array size that a function may return. If this value is exceeded the excess records are chopped off.
das.group-series-expression.records.max	-1	Maximum number of records a group series expression can generate.
das.preview .generation.additional-records-ratio	0.2f	All tasks together will try to create a preview of maxPreviewSize*the-configured-ratio in order to balance tasks with less records.
das.preview .group-series-expression.records.max	100	Maximum number of records a group series expression can generate for a preview.
das.jdbc.imp ort.sql.badwords	commit, savepoint, rollback, set, checkpoint, grant, revoke, insert, update, delete, index, alter, create, lock, drop, truncate, ;, rename, comment, call, merge, explain, shutdown, show, describe, exec, go, declare	List of words that are not allowed in SQL entered by the user in SQL import. The string is broken up at the ',' and any spaces are part of the bad words. The string is parsed as a String[]. Examples of bad word sql follows: - select * from mytable; -- semicolon is invalid <br> - drop database dap -- drop is invalid<br> - create table ... -- create is invalid<br> - <p> - select "savepoint", * from table -- currently the bad words can't show up in column names or - data either INFO This property should be updated on the `das-conductor.properties` file. After updating this property, restart Datameer.
das.conductor.default.record.sample.size	1,000	controls what 'Records for schema detection' value is set by default whenever a user creates a new Import Job, Data Link or File Upload should be adjusted, e.g. when working with large JSON objects (should be decreased to 250 - 500) available as of Datameer 11.2.3 a restart is needed after changing the property in the 'conf/default.properties' file once updated, it affects only newly created Import Jobs, the 'Records for schema detection' value for existing artifacts remains intact

List of Hadoop Properties

Name	Default Value	Description
fs.AbstractFileSystem.hdfs.impl	org.apache.hadoop.fs.Hdfs	Property is required for successfully starting yarn application as these properties are stripped out while setting up the overlay by DAS framework.
io.compression.codecs.addition	datameer.dap.common.util.ZipCodec,datameer.dap.common.util.LzwCodec	Property is required for successfully starting yarn application as these properties are stripped out while setting up the overlay by DAS framework. Additional comma=separated compression codecs that are added to io.compression.codecs
das.yarn.available-node-vcores	auto	This property sets the number of available node vcores and is used in order to calculate the optimal number of splits and tasks (numberOfNodes * das.yarn.available-node-vcores). It can be set either to the number of free CPUs per node, or it can be set to auto. In auto mode, Datameer X fetches information about the vCores from every node and sets das.yarn.available-node-vcores to the average of the available vCores.
das.job.health.check	true	Turn das job configuration health check on for cluster configuration.
das.local.exec.map.count	5	DAS property to influence the number of mappers in Local Execution mode.
das.job.queue	<cluster queue name>

List of Hive Properties

Name	Default Value	Description
dap.hive.use-datameer-file-splitter	fales	Property decides whether Datameer X should use Datameer's FileSplitter logic to generate RewindableFileSplits or Hive's own splitting logic.

List of Execution Framework Properties

Name	Default Value	Description
General
das.execution-framework	Tez	Sets the execution framework e.g. 'das.execution-framework=Spark' to run Spark as the execution framework or 'das.execution-framework=Tez' to run Tez as the execution framework.
TEZ
das.tez.session-pool.max-cached-sessions	auto	Maximum number of idle session to be held in cache. 0 means no session pooling, auto uses the number of nodes in the cluster as value for the maximum number of sessions.
das.tez.session-pool.max-idle-time	2m	The timeout for the sessions held in pool for which they wait for DAG to be submitted.
das.tez.session-pool.max-time-to-live	2h	Maximum amount of time a tez session will be alive irrespective of being idle or active since its start time.
tez.runtime.compress	true	Settings for intermediate compression with Tez.
tez.runtime.compress.codec	org.apache.hadoop.io.compress.SnappyCodec	Settings for intermediate compression with Tez.
framework.local.das.parquet-storage.max-parquet-block-size	67108864	For local execution framework setting the max parquet block size to 64MB(can't be raised beyond 64MB but, can be lowered) by default.
tez.shuffle-vertex-manager.desired-task-input-size	52428800	Sets the input size for each TEZ sub-task.
das.cluster.plugin.resources.fixer.enabled	true	Intercepts the YARN errors YARN-3591 and YARN 6641 and rebuilds the missing plug-in class files on the fly. Setting the value to 'false' disables the property.
YARN MR2
das.yarn.base-counter-wait-time	40000	YARN Counters take a while to show up at the Job History Server, so we use this base wait time + a small factor * the number of executed tasks to wait for the counters to finally show up.

List of Smart Execution Properties

INFO

These properties are exclusively for the Smart Execution license.

Name	Default Value	Description
tez.am.shuffle-vertex-manager.desired-task-input-size	50	Set the input size for each TEZ sub-task.
das.execution-framework	smart	Force a job to be run with a specific execution framework Smart Execution = Smart Optimized MapReduce = Tez SmallJob Execution = SmallJob Spark Smart Execution = Smart Local Mode = local (default and the only execution framework in local mode)
das.execution-framework.small-job.max-records	1000000	Set a threshold size for number of records to choose execution framework.
das.execution-framework.small-job.max-uncompressed	1000000000	Set a threshold size for uncompressed file size to choose execution framework.

List of Windows Properties

Name	Default Value	Description
windows.das.join.disabled-strategies	MEMORY_BACKED_MAP_SIDE	By default, memory backed joins are enabled on Windows platform, if required to disable, please uncomment the property.
mapreduce.input.linerecordreader.line.maxlength	2097152	Controls the maximum line size (in characters) allowed before filtering it on read. Below value is around a maximum of 4MB per line.

List of Error Handling Properties

Name	Default Value	Description
workbook.error-handling.default	IGNORE	Legal values for workbook error handling are IGNORE, DROP_RECORD, ABORT_JOB. The equivalent error handling modes in the UI are Ignore, Skip and Abort.
export-job.error-handling.default	DROP_RECORD	Legal values for export job error handling are IGNORE, DROP_RECORD, ABORT_JOB. The equivalent error handling modes in the UI are Ignore error, Drop record and Abort job.
import-job.error-handling.default	DROP_RECORD	Legal values for import job error handling are DROP_RECORD, ABORT_JOB. The equivalent error handling modes in the UI are Drop record and Abort job.
data-link.error-handling.default	DROP_RECORD	Legal values for data link error handling are DROP_RECORD, ABORT_JOB. The equivalent error handling modes in the UI are Drop record and Abort job.

Adding a Custom Property

INFO

Custom properties can be added to apply system-wide or to apply only for specific jobs.

Adding Custom Properties Applied to all Jobs

To add a system-wide custom property:

Click on the "Admin" tab and select the menu tab "Hadoop Cluster". The overview page for the Hadoop Cluster configuration opens.
Click on "Enter". The Hadoop Cluster configuration page opens.
Enter the custom properties in the field "Custom Properties" and confirm with "Enter". The configuration is saved.

Adding Custom Properties Applied to Specific a Workbook Job

To add a workbook job specific custom property:

Double-click the required workbook from the File Browser. The workbook opens.
Select "File" and select "Configure". The workbook configuration page opens.
Enter the required custom properties in the field "Custom Properties" and confirm with "Save". The workbook job configuration is saved.

Editing Custom Properties for Compressed Data

When importing compressed data, the requirements are different for settings custom properties than other custom properties.

To decompress data you're importing, all compression codec details need to be put within the conf/das-common.properties files.

This includes, for LZO compression:

io.compression.codecs
io.compression.codec.lzo.class
mapred.map.output.compression.codec

As a best practice, put all compression details in the properties files, and adjust their tuning parameters, if necessary, in the interface.

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