Org.apache.spark.sparkexception job aborted due to stage failure - : org.apache.spark.SparkException: Job aborted due to stage failure: Serialized task 302987:27 was 139041896 bytes, which exceeds max allowed: spark.akka.frameSize (134217728 bytes) - reserved (204800 bytes).

 
In my project i am using spark-Cassandra-connector to read the from Cassandra table and process it further into JavaRDD but i am facing issue while processing Cassandra row to javaRDD.. How to

Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsPyspark. spark.SparkException: Job aborted due to stage failure: Task 0 in stage 15.0 failed 1 times, java.net.SocketException: Connection reset Hot Network Questions Main character is charged an exorbitant computing bill after abusing his uploaded consciousness powersFeb 14, 2020 · Go into the cluster settings, under Advanced select spark and paste spark.driver.maxResultSize 0 (for unlimited) or whatever the value suits you. Using 0 is not recommended. You should optimize the job by re partitioning. For more details, refer "Spark Configurations - Application Properties". Hope this helps. Do let us know if you any further ... Jun 9, 2020 · Our reports and datasets imports data from Databricks Spark Delta tables using the Spark connector into our Premium P1 capacity. We're using incremental refresh for the larger (fact) tables, but we're having trouble with the initial refresh after publishing the pbix file. When refreshing large datasets it often fails after 30-60 minutes with ... 报错如下: : org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 3.0 failed 4 times, most recent failure: ...one can solve this job aborted error, either changing the "spark configuration" in the cluster or either use "try_cast" function when you are getting this error while inserting data from one table to another table in databricks. use dbr version : 10.4 LTS (includes Apache Spark 3.2.1, Scala 2.12)Jan 3, 2022 · Based on the code , am not seeing anything wrong . Still you can analysis this issue based on the following data related . Make sure 4th line lines rdd has the data based on the collect(). org.apache.spark.shuffle.MetadataFetchFailedException: Missing an output location for shuffle 0 解决方法:这种问题一般发生在有大量shuffle操作的时候,task不断的failed,然后又重执行,一直循环下去,直到application失败。Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsJun 1, 2022 · Collectives™ on Stack Overflow – Centralized & trusted content around the technologies you use the most. Nov 2, 2020 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams Feb 6, 2019 · I am new to PySpark. I have been writing my code with a test sample. Once I run the code on the larger file(3gb compressed). My code is only doing some filtering and joins. I keep getting errors org.apache.spark.SparkException: Job aborted due to stage failure: Task 3 in stage 6.0 failed 1 times, most recent failure: Lost task 3.0 in stage 6.0 (TID 62, LAPTOP-H7MM9952, executor driver): org.apache.spark.SparkException: Task failed while writing rows.org.apache.spark.SparkException: Job aborted due to stage failure: Task 29 in stage 0.0 failed 4 times, most recent failure: Lost task 29.3 in stage 0.0 (TID 92, 10.252.252.125, executor 23): ExecutorLostFailure (executor 23 exited caused by one of the running tasks) Reason: Remote RPC client disassociated.Solve : org.apache.spark.SparkException: Job aborted due to stage failure Load 7 more related questions Show fewer related questions 0Part of Microsoft Azure Collective. 0. Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 5 in stage 76.0 failed 4 times, most recent failure: Lost task 5.3 in stage 76.0 (TID 2334) (10.139.64.5 executor 6): com.databricks.sql.io.FileReadException: Error while reading file <File_Path> It is possible the ...Dec 6, 2018 · 1. "Accept timed out" generally points to a problem with your spark instance. It may be overloaded or not enough resources (memory/cpu) to start your job or it might be a temporary network issue. You can monitor you jobs on Spark UI. Also there is some issue with your code. Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsI installed apache-spark and pyspark on my machine (Ubuntu), and in Pycharm, I also updated the environment variables (e.g. spark_home, pyspark_python). I'm trying to do: import os, sys os.environ[' org.apache.spark.SparkException: Job aborted due to stage failure: Task 73 in stage 979.0 failed 1 times, most recent failure: Lost task 73.0 in stage 979.0 (TID 32624, localhost, executor driver): org.apache.spark.SparkException: Failed to execute user defined function($anonfun$4: (struct<other_double_VectorAssembler_a2059b1f0691:double ...org.apache.spark.SparkException: Job aborted due to stage failure: Task 73 in stage 979.0 failed 1 times, most recent failure: Lost task 73.0 in stage 979.0 (TID 32624, localhost, executor driver): org.apache.spark.SparkException: Failed to execute user defined function($anonfun$4: (struct<other_double_VectorAssembler_a2059b1f0691:double ...If absolutely necessary you can set the property spark.driver.maxResultSize to a value <X>g higher than the value reported in the exception message in the cluster Spark config ( AWS | Azure ): spark.driver.maxResultSize < X > g. The default value is 4g. For details, see Application Properties. If you set a high limit, out-of-memory errors can ...Solution 1. Check your environment variables. You are getting “py4j.protocol.Py4JError: org.apache.spark.api.python.PythonUtils.getEncryptionEnabled does not exist in the JVM” due to Spark environemnt variables are not set right.Jul 7, 2019 · 1 I'm trying to use Linear Regression on a simple dataframe with one feature and one label using Python pyspark in Databricks. However, I'm running into some issues with stage failure. I've reviewed many similar problems, but most of them are in Scala or are out of the scope of what I'm doing here. Versions: May 2, 2016 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams org.apache.spark.SparkException: Job aborted due to stage failure: Task 3 in stage 6.0 failed 1 times, most recent failure: Lost task 3.0 in stage 6.0 (TID 62, LAPTOP-H7MM9952, executor driver): org.apache.spark.SparkException: Task failed while writing rows.Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsMar 23, 2014 · FYI in Spark 2.4 a lot of you will probably encounter this issue. Kryo serialization has gotten better but in many cases you cannot use spark.kryo.unsafe=true or the naive kryo serializer. For a quick fix try changing the following in your Spark configuration spark.kryo.unsafe="false" OR. spark.serializer="org.apache.spark.serializer ... Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 119, localhost, executor driver): ExecutorLostFailure (executor driver exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 128839 ...Jan 4, 2019 · Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 119, localhost, executor driver): ExecutorLostFailure (executor driver exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 128839 ... org.apache.spark.SparkException: Job aborted due to stage failure: Task XXX in stage YYY failed 4 times, most recent failure: Lost task XXX in stage YYY (TID ZZZ, ip-xxx-xx-x-xxx.compute.internal, executor NNN): ExecutorLostFailure (executor NNN exited caused by one of the running tasks) Reason: ... 解決方法 理由コードの検索 Saved searches Use saved searches to filter your results more quicklyJan 24, 2022 · 1 Answer. Sorted by: 1. You need to create an RDD of type RDD [Tuple [str]] but in your code, the line: rdd = spark.sparkContext.parallelize (comments) returns RDD [str] which then fails when you try to convert it to dataframe with that given schema. Try modifying that line to: I am trying to run a pyspark job but it is failing on RDD collectAndServe method. I do not have any memory issues. I have all updated jars in my jars folder. Python worker is crashing with below er...Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Total size of serialized results of 478 tasks (2026.0 MB) is bigger than spark.driver.maxResultSize (1024.0 MB) 当然可以通过调大spark.driver.maxResultSize的默认配置来解决问题,但如果不能从源头上解决小文件问题,以后还可能遇到 ...Mar 29, 2020 · Check Apache Spark installation on Windows 10 steps. Use different versions of Apache Spark (tried 2.4.3 / 2.4.2 / 2.3.4). Disable firewall windows and antivirus that I have installed. Tried to initialize the SparkContext manually with sc = spark.sparkContext (found this possible solution at this question here in Stackoverflow, didn´t work for ... Mar 31, 2019 · org.apache.spark.SparkException: Job aborted due to stage failure: Task in stage failed,Lost task in stage : ExecutorLostFailure (executor 4 lost) Ask Question Asked 4 years, 5 months ago If absolutely necessary you can set the property spark.driver.maxResultSize to a value <X>g higher than the value reported in the exception message in the cluster Spark config ( AWS | Azure ): spark.driver.maxResultSize < X > g. The default value is 4g. For details, see Application Properties. If you set a high limit, out-of-memory errors can ...strange org.apache.spark.SparkException: Job aborted due to stage failure again. I'm trying to deploy spark application on standalone mode. In this application I'm training Naive Bayes classifier by using tf-idf vectors. I wrote application in similar manner to this post ( Spark MLLib TFIDF implementation for LogisticRegression ) The difference ...For Spark jobs submitted with --deploy-mode cluster, run the following command on the master node to find stage failures in the YARN application logs. Replace application_id with the ID of your Spark application (for example, application_1572839353552_0008 ). yarn logs -applicationId application_id | grep "Job aborted due to stage failure" -A 10. Jan 4, 2019 · Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 119, localhost, executor driver): ExecutorLostFailure (executor driver exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 128839 ... Jun 25, 2020 · Apache Spark; koukou. ... org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 30.0 failed 1 times, most recent failure: Lost task 0.0 ... at Source 'source': org.apache.spark.SparkException: Job aborted due to stage failure: Task 3 in stage 15.0 failed 1 times, most recent failure: Lost task 3.0 in stage 15.0 (TID 35, vm-85b29723, executor 1): java.nio.charset.MalformedInputException: Input length = 1Nov 2, 2020 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams You need to change this parameter in the cluster configuration. Go into the cluster settings, under Advanced select spark and paste spark.driver.maxResultSize 0 (for unlimited) or whatever the value suits you. Using 0 is not recommended. You should optimize the job by re partitioning.Solve : org.apache.spark.SparkException: Job aborted due to stage failure 1 Spark Error: Executor XXX finished with state EXITED message Command exited with code 1 exitStatus 1>>Job aborted due to stage failure: Total size of serialized results of 19 tasks (4.2 GB) is bigger than spark.driver.maxResultSize (4.0 GB)'.. The exception was raised by the IDbCommand interface. Please take a look at following document about maxResultsize issue:Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about TeamsCaused by: org.apache.spark.SparkException: Job aborted due to stage failure: Total size of serialized results of 478 tasks (2026.0 MB) is bigger than spark.driver.maxResultSize (1024.0 MB) 当然可以通过调大spark.driver.maxResultSize的默认配置来解决问题,但如果不能从源头上解决小文件问题,以后还可能遇到 ...Sep 14, 2020 · Hi Team, I am writing a Delta file in ADL-Gen2 from ADF for multiple files dynamically using Dataflows activity. For the initial run i am able to read the file from Azure DataBricks . But when i rerun the pipeline with truncate and load i am getting… Feb 24, 2022 · Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 5 in stage 76.0 failed 4 times, most recent failure: Lost task 5.3 in stage 76.0 (TID 2334) (10.139.64.5 executor 6): com.databricks.sql.io.FileReadException: Error while reading file <File_Path> It is possible the underlying files have been updated. May 2, 2016 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams Solve : org.apache.spark.SparkException: Job aborted due to stage failure Load 7 more related questions Show fewer related questions 0Jan 3, 2022 · Based on the code , am not seeing anything wrong . Still you can analysis this issue based on the following data related . Make sure 4th line lines rdd has the data based on the collect(). I'm new to spark, and was trying to run the example JavaSparkPi.java, it runs well, but because i have to use this in another java s I copy all things from main to a method in the class and try to call the method in main, it saids . org.apache.spark.SparkException: Job aborted: Task not serializable: java.io.NotSerializableExceptionSaved searches Use saved searches to filter your results more quicklyDec 29, 2018 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams FYI in Spark 2.4 a lot of you will probably encounter this issue. Kryo serialization has gotten better but in many cases you cannot use spark.kryo.unsafe=true or the naive kryo serializer. For a quick fix try changing the following in your Spark configuration spark.kryo.unsafe="false" OR. spark.serializer="org.apache.spark.serializer ...I am running spark jobs using datafactory in azure databricks. My cluster vesion is 9.1 LTS ML (includes Apache Spark 3.1.2, Scala 2.12). I am writing data on azure blob storage. While writing job ...If I had a penny for every time I asked people "have you tried increasing the number of partitions to something quite large like at least 4 tasks per CPU - like even as high as 1000 partitions?"报错如下: : org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 3.0 failed 4 times, most recent failure: ...Feb 6, 2019 · I am new to PySpark. I have been writing my code with a test sample. Once I run the code on the larger file(3gb compressed). My code is only doing some filtering and joins. I keep getting errors Solve : org.apache.spark.SparkException: Job aborted due to stage failure 1 Spark Error: Executor XXX finished with state EXITED message Command exited with code 1 exitStatus 1I am doing it using spark code. But when i try to run the code I get following exception org.apache.spark.SparkException: Job aborted due to stage failure: Task 2 in stage 1.0 failed 4 times, most recent failure: Lost task 2.3 in stage 1.0 (TID 9, XXXX.XXX.XXX.local): org.apache.spark.SparkException: Task failed while writing rows.SparkException:执行 spark 操作时 Python 工作线程无法连接回spark.SparkException: Python worker failed to connect back.问问题当我尝试在 pyspark 执行此命令行时from pyspark import SparkConf, SparkContext# 创建SparkConf和SparkContextconf = SparkConf().setMaster("local").setAppName("lic1 Answer. PySpark DF are lazy loading. When you call .show () you are asking the prior steps to execute and anyone of them may not work, you just can't see it until you call .show () because they haven't executed. I go back to earlier steps and call .collect () on each operation of the DF. This will at least allow you to isolate where the bad ...FYI in Spark 2.4 a lot of you will probably encounter this issue. Kryo serialization has gotten better but in many cases you cannot use spark.kryo.unsafe=true or the naive kryo serializer. For a quick fix try changing the following in your Spark configuration spark.kryo.unsafe="false" OR. spark.serializer="org.apache.spark.serializer ...SparkException:执行 spark 操作时 Python 工作线程无法连接回spark.SparkException: Python worker failed to connect back.问问题当我尝试在 pyspark 执行此命令行时from pyspark import SparkConf, SparkContext# 创建SparkConf和SparkContextconf = SparkConf().setMaster("local").setAppName("licApr 9, 2021 · Viewed 8k times. 1. I am trying to do some computation using UDFs. But after the computation when i try to convert the pyspark dataframe to pandas it gives me org.apache.spark.SparkException: Exception thrown in awaitResult: I will put down the reproducible code. import pandas as pd import numpy as np import time n = 10000 sample_df = pd ... Oct 6, 2017 · @Tim, actually no I have set of operations like val source_primary_key = source.map(rec => (rec.split(",")(0), rec)) source_primary_key.persist(StorageLevel.DISK_ONLY) val extra_in_source = source_primary_key.subtractByKey(destination_primary_key) var pureextinsrc = extra_in_source.count() extra_in_source.cache()and so on but before this its throwing out of memory exception while im fetching ... Oct 31, 2022 · I am trying to run a pyspark job but it is failing on RDD collectAndServe method. I do not have any memory issues. I have all updated jars in my jars folder. Python worker is crashing with below er... Error: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 1985.0 failed 4 times, most recent failure: Lost task 0.3 in stage 1985.0 (TID 57569, 10.139.64.12, executor 15): com.microsoft.sqlserver.jdbc.SQLServerException: Conversion failed when converting the nvarchar value 'Aug' to data type int.Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brandSparkException: Job aborted due to stage failure: Task 58 in stage 13.0 failed 4 times, most recent failure: Lost task 58.3 in stage 13.0 (TID 488, 10.32.14.43, executor 4): java.lang.IllegalArgumentException: Illegal pattern character 'Q'If absolutely necessary you can set the property spark.driver.maxResultSize to a value <X>g higher than the value reported in the exception message in the cluster Spark config ( AWS | Azure ): spark.driver.maxResultSize < X > g. The default value is 4g. For details, see Application Properties. If you set a high limit, out-of-memory errors can ...Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Aborting TaskSet 0.0 because task 0 (partition 0) cannot run anywhere due to node and executor blacklist.Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 119, localhost, executor driver): ExecutorLostFailure (executor driver exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 128839 ...Apr 8, 2019 · scala - org.apache.spark.SparkException: Job aborted due to stage failure: Task 98 in stage 11.0 failed 4 times - Stack Overflow org.apache.spark.SparkException: Job aborted due to stage failure: Task 98 in stage 11.0 failed 4 times Ask Question Asked 4 years, 4 months ago Modified 4 years, 4 months ago Viewed 46k times May 16, 2022 · Problem Databricks throws an error when fitting a SparkML model or Pipeline: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in s Here is a method to parallelize serial JDBC reads across multiple spark workers... you can use this as a guide to customize it to your source data ... basically the main prerequisite is to have some kind of unique key to split on.Apr 9, 2021 · Viewed 8k times. 1. I am trying to do some computation using UDFs. But after the computation when i try to convert the pyspark dataframe to pandas it gives me org.apache.spark.SparkException: Exception thrown in awaitResult: I will put down the reproducible code. import pandas as pd import numpy as np import time n = 10000 sample_df = pd ... Mar 29, 2020 · Check Apache Spark installation on Windows 10 steps. Use different versions of Apache Spark (tried 2.4.3 / 2.4.2 / 2.3.4). Disable firewall windows and antivirus that I have installed. Tried to initialize the SparkContext manually with sc = spark.sparkContext (found this possible solution at this question here in Stackoverflow, didn´t work for ... According to the content of README.md of GitHub repo Azure/azure-cosmosdb-spark as the figure below, you may should switch to use the latest jar file azure-cosmosdb-spark_2.4.0_2.11-1.4.0-uber.jar in it. And the maven repo for Azure CosmosDB Spark has released to 1.4.1 version, as the figure below.Jul 17, 2020 · Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Serialized task 2:0 was 155731289 bytes, which exceeds max allowed: spark.rpc.message.maxSize (134217728 bytes). Consider increasing spark.rpc.message.maxSize or using broadcast variables for large values. Sep 14, 2020 · Hi Team, I am writing a Delta file in ADL-Gen2 from ADF for multiple files dynamically using Dataflows activity. For the initial run i am able to read the file from Azure DataBricks . But when i rerun the pipeline with truncate and load i am getting… 不知道是什么原因。. (利用 Spark-submit 提交 参数都正常). 但是 集群上的版本是1.5,和2.0都无法跑出来结果,但是1.3就能出结果, 所以目前确定是 Spark 1.5以上的版本对协同过滤算法不兼容引起,具体原因不详。. task倾斜原因比较多,网络io,cpu,mem都有可能造成 ...Dec 11, 2017 · hello everyone I am working on PySpark Python and I have mentioned the code and getting some issue, I am wondering if someone knows about the following issue? windowSpec = Window.partitionBy(df['id']).orderBy(df_Broadcast['id']) windowSp...

不知道是什么原因。. (利用 Spark-submit 提交 参数都正常). 但是 集群上的版本是1.5,和2.0都无法跑出来结果,但是1.3就能出结果, 所以目前确定是 Spark 1.5以上的版本对协同过滤算法不兼容引起,具体原因不详。. task倾斜原因比较多,网络io,cpu,mem都有可能造成 .... Asher

org.apache.spark.sparkexception job aborted due to stage failure

You need to change this parameter in the cluster configuration. Go into the cluster settings, under Advanced select spark and paste spark.driver.maxResultSize 0 (for unlimited) or whatever the value suits you. Using 0 is not recommended. You should optimize the job by re partitioning.Feb 24, 2022 · Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 5 in stage 76.0 failed 4 times, most recent failure: Lost task 5.3 in stage 76.0 (TID 2334) (10.139.64.5 executor 6): com.databricks.sql.io.FileReadException: Error while reading file <File_Path> It is possible the underlying files have been updated. Jan 4, 2019 · Exception in thread "main" org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost task 0.0 in stage 2.0 (TID 119, localhost, executor driver): ExecutorLostFailure (executor driver exited caused by one of the running tasks) Reason: Executor heartbeat timed out after 128839 ... Dec 29, 2020 · When I run the demo : from pyspark.ml.linalg import Vectors import tempfile conf = SparkConf().setAppName('ansonzhou_test').setAll([ ('spark.executor.memory', '8g ... : org.apache.spark.SparkException: Job aborted due to stage failure: Task 9 in stage 47.0 failed 4 times, most recent failure: Lost task 9.3 in stage 47.0 (TID 2256, ip-172-31-00-00.eu-west-1.compute.internal, executor 10): org.apache.spark.sql.execution.QueryExecutionException: Parquet column cannot be converted in file s3a://bucket/prod ...Sep 1, 2022 · use dbr version : 10.4 LTS (includes Apache Spark 3.2.1, Scala 2.12) for spark configuartion edit the spark tab by editing the cluster and use below code there. "spark.sql.ansi.enabled false" Hi! I run 2 to spark an option SPARK_MAJOR_VERSION=2 pyspark --master yarn --verbose spark starts, I run the SC and get an error, the field in the table exactly there. not the problem SPARK_MAJOR_VERSION=2 pyspark --master yarn --verbose SPARK_MAJOR_VERSION is set to 2, using Spark2 Python 2.7.12 ...I am trying to run a pyspark job but it is failing on RDD collectAndServe method. I do not have any memory issues. I have all updated jars in my jars folder. Python worker is crashing with below er...Nov 28, 2019 · : org.apache.spark.SparkException: Job aborted due to stage failure: Task 9 in stage 47.0 failed 4 times, most recent failure: Lost task 9.3 in stage 47.0 (TID 2256, ip-172-31-00-00.eu-west-1.compute.internal, executor 10): org.apache.spark.sql.execution.QueryExecutionException: Parquet column cannot be converted in file s3a://bucket/prod ... spark.shuffle.consolidateFiles will only help if you override the default to use HashShuffleManager instead of the default HashShuffleManager enabled by default after Spark 1.2 (which defaults to spark.shuffle.manager=sort), and I think does not even apply to Spark 2.x –Jun 20, 2019 · Here is a method to parallelize serial JDBC reads across multiple spark workers... you can use this as a guide to customize it to your source data ... basically the main prerequisite is to have some kind of unique key to split on. .

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