Known Issues

Summary of known issues for this release.

Table 1. Known Issues
Hortonworks Bug ID	Apache JIRA	Apache Component	Summary
N/A	N/A	NiFi	JDK 8u242 and newer versions cause Site-to-Site failure When you use JDK 8u242 or a newer version, the RAW transport protocol in Site-to-Site fails with the following exception: `2018-12-19 16:19:26,811 ERROR [Site-to-Site Listener] org.apache.nifi.NiFi java.nio.channels.IllegalBlockingModeException: null at java.base/sun.nio.ch.ServerSocketAdaptor.accept(ServerSocketAdaptor.java:121) at org.apache.nifi.remote.SocketRemoteSiteListener$1.run(SocketRemoteSiteListener.java:125) at java.base/java.lang.Thread.run(Thread.java:834)` Workarounds: Choose one of the following options before upgrading to JDK 8u242 or a newer JDK version: Upgrade to HDF 3.51 or a newer version. Cloudera recommends this option. Change all the Remote Process Groups and Site-to-Site based reporting tasks to use HTTP transport protocol instead of RAW transport protocol. If neither of these options work for you, contact Cloudera Support for other options.
BUG-108848	N/A	Kafka	Kafka 1.1.1 producer cannot produce messages with snappy compression on IBM Power.

Table 2. Technical Service Bulletin
Technical Service Bulletin	Apache JIRA	Apache component	Summary
TSB-497	N/A	Solr	CVE-2021-27905: Apache Solr SSRF vulnerability with the Replication handler The Apache Solr ReplicationHandler (normally registered at "/replication" under a Solr core) has a "masterUrl" (also "leaderUrl" alias) parameter. The “masterUrl” parameter is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To help prevent the CVE-2021-27905 SSRF vulnerability, Solr should check these parameters against a similar configuration used for the "shards" parameter. For the latest update on this issue, see the corresponding Knowledge article: TSB 2021-497: CVE-2021-27905: Apache Solr SSRF vulnerability with the Replication handler