Known Issues in Apache Spark
Learn about the known issues in Spark, the impact or changes to the functionality, and the workaround.
- CDPD-60862: Rolling restart fails during ZDU when DDL operations are in progress
During a Zero Downtime Upgrade (ZDU), the rolling restart of services that support Data Definition Language (DDL) statements might fail if DDL operations are in progress during the upgrade. As a result, ensure that you do not run DDL statements during ZDU.The following services support DDL statements:
- Hive – using HiveQL
- Spark – using SparkSQL
Data Manipulation Lanaguage (DML) statements are not impacted and can be used during ZDU. Following the successful upgrade, you can resume running DDL statements.
- None. Cloudera recommends modifying applications to not use DDL statements for the duration of the upgrade. If the upgrade is already in progress, and you have experienced a service failure, you can remove the DDLs in-flight and resume the upgrade from the point of failure.
- CDPD-23817: In the upgraded Cluster, the permission of /tmp/spark is restricted due to the HDP configuration hive.exec.scratchdir=/tmp/spark.
- If you are using the /tmp/spark directory in the CDP cluster, you must provide the required additional Policies/ACL permissions.
- CDPD-22670 and CDPD-23103: There are two configurations in Spark, "Atlas dependency" and "spark_lineage_enabled", which are conflicted. The issue is when Atlas dependency is turned off but spark_lineage_enabled is turned on.
- Run Spark application, Spark will log some error message and cannot continue. That can be restored by correcting the configurations and restarting Spark component with distributing client configurations.
- CDPD-23007: Mismatch in the Spark Default DB Location. In HDP 3.1.5, hive_db entities have one attribute - 'location' which is configured to the '/managed' path. In fresh install of CDP 7.1.7, hive_db entities now have 2 attributes 'location' configured to '/external' path and 'managedLocation' configured to '/managed' path. In. the AM2CM migration (HDP 3.1.5 -> CDP 7.1.7), the 'location' attribute from hive_db entities in HDP 3.1.5 comes unaltered to CDP 7.1.7 and hence maps to '/managed' path.
- This issue arises only if you are upgrading from HDP 3.1.5 to CDP 7.1.7. If you are performing a fresh install of CDP 7.1.7, you can ignore this issue.
- CDPD-217: The Apache Spark connector is not supported
- The old Apache Spark - Apache HBase Connector
shc) is not supported in CDP releases.
- Use the new HBase-Spark connector shipped in CDP release.
- CDPD-3038: Launching
pysparkdisplays several HiveConf warning messages
pysparkstarts, several Hive configuration warning messages are displayed, similar to the following:
23/08/02 08:37:26 WARN conf.HiveConf: HiveConf of name hive.metastore.runworker.in does not exist 23/08/02 08:37:26 WARN conf.HiveConf: HiveConf of name hive.masking.algo does not exist 23/08/02 08:37:34 WARN conf.HiveConf: HiveConf of name hive.metastore.runworker.in does not exist 23/08/02 08:37:34 WARN conf.HiveConf: HiveConf of name hive.masking.algo does not exist
- These errors can be safely ignored.