Download CDH 5.2.6
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Long term component architecture

As the main curator of open standards in Hadoop, Cloudera has a track record of bringing new open source solutions into its platform (such as Apache Spark, Apache HBase, and Apache Parquet) that are eventually adopted by the community at large. As standards, you can build longterm architecture on these components with confidence.



With the exception of DSSD support, Cloudera Enterprise 5.6.0 is identical to CDH 5.5.2/Cloudera Manager 5.5.3  If you do not need DSSD support, you do not need to upgrade if you are already using the latest 5.5.x release.


CDH 5 provides packages for Red-Hat-compatible, SLES, Ubuntu, and Debian systems as described below.

Operating System Version Packages
Red Hat Enterprise Linux (RHEL)-compatible
Red Hat Enterprise Linux 5.7 64-bit
  6.2 64-bit
  6.4 64-bit
  6.4 in SE Linux mode 64-bit
  6.5 64-bit
CentOS 5.7 64-bit
  6.2 64-bit
  6.4 64-bit
  6.4 in SE Linux mode 64-bit
  6.5 64-bit
Oracle Linux with default kernel and Unbreakable Enterprise Kernel 5.6 (UEK R2) 64-bit
  6.4 (UEK R2) 64-bit
  6.5 (UEK R2, UEK R3) 64-bit
SLES Linux Enterprise Server (SLES) 11 with Service Pack 2 or later 64-bit
Ubuntu Precise (12.04) - Long-Term Support (LTS) 64-bit
  Trusty (14.04) - Long-Term Support (LTS) 64-bit
Debian Wheezy (7.0, 7.1) 64-bit


  • CDH 5 provides only 64-bit packages.
  • Cloudera has received reports that our RPMs work well on Fedora, but we have not tested this.
  • If you are using an operating system that is not supported by Cloudera packages, you can also download source tarballs from Downloads.


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Component MySQL SQLite PostgreSQL Oracle Derby - see Note 4
Oozie 5.5, 5.6 8.4, 9.1, 9.2, 9.3

See Note 2

11gR2 Default
Flume Default (for the JDBC Channel only)
Hue 5.5, 5.6

See Note 1

Default 8.4, 9.1, 9.2, 9.3

See Note 2

Hive/Impala 5.5, 5.6

See Note 1

8.4, 9.1, 9.2, 9.3

See Note 2

11gR2 Default
Sentry 5.5, 5.6

See Note 1

8.4, 9.1, 9.2,, 9.3

See Note 2

Sqoop 1 See Note 3 See Note 3 See Note 3
Sqoop 2 See Note 4 See Note 4 See Note 4 Default


  1. MySQL 5.5 is supported on CDH 5.1. MySQL 5.6 is supported on CDH 5.1 and later.
  2. PostgreSQL 9.2 is supported on CDH 5.1 and later. PostgreSQL 9.3 is supported on CDH 5.2 and later.
  3. For the purposes of transferring data only, Sqoop 1 supports MySQL 5.0 and above, PostgreSQL 8.4 and above, Oracle 10.2 and above, Teradata 13.10 and above, and Netezza TwinFin 5.0 and above. The Sqoop metastore works only with HSQLDB (1.8.0 and higher 1.x versions; the metastore does not work with any HSQLDB 2.x versions).
  4. Sqoop 2 can transfer data to and from MySQL 5.0 and above, PostgreSQL 8.4 and above, Oracle 10.2 and above, and Microsoft SQL Server 2012 and above. The Sqoop 2 repository database is supported only on Derby.
  5. Derby is supported as shown in the table, but not always recommended. See the pages for individual components in the Cloudera Installation and Upgrade guide for recommendations.
Selected tab: supporteddatabases

CDH 5 is supported with the versions shown in the table that follows.

Table 1. Supported JDK Versions

Latest Certified Version Minimum Supported Version Exceptions
1.7.0_67 1.7.0_67 None
1.8.0_11 1.8.0_11 None

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CDH requires IPv4. IPv6 is not supported.

See also Configuring Network Names.

Selected tab: supportedinternetprotocol
Selected tab: systemrequirements

Known Issues Fixed in CDH 5.2.6


Upstream Issues Fixed

The following upstream issues are fixed in CDH 5.2.6:

  • CRUNCH-516 - Scrunch needs some additional null checks
  • CRUNCH-508 - Improve performance of Scala Enumeration counters in Scrunch
  • CRUNCH-514 - AvroDerivedDeepCopier should initialize delegate MapFns
  • CRUNCH-530 - Fix object reuse bug in GenericRecordToTuple
  • HADOOP-12103 - Small refactoring of DelegationTokenAuthenticationFilter to allow code sharing
  • HADOOP-10839 - Add unregisterSource() to MetricsSystem API
  • HDFS-8337 - Accessing httpfs via webhdfs doesn't work from a jar with kerberos
  • HDFS-7546 - Document, and set an accepting default for dfs.namenode.kerberos.principal.pattern
  • HDFS-6997 - Archival Storage: add more tests for data migration and replicaion
  • HDFS-7980 - Incremental BlockReport will dramatically slow down the startup of a namenode
  • HDFS-8380 - Always call addStoredBlock on blocks which have been shifted from one storage to another
  • HDFS-7312 - Update DistCp v1 to optionally not use tmp location (branch-1 only)
  • YARN-3485 - FairScheduler headroom calculation doesn't consider maxResources for Fifo and FairShare policies
  • YARN-3241 - FairScheduler handles "invalid" queue names inconsistently
  • YARN-2669 - FairScheduler: queue names shouldn't allow periods
  • YARN-3022 - Expose Container resource information from NodeManager for monitoring
  • YARN-2984 - Metrics for container's actual memory usage
  • YARN-3465 - Use LinkedHashMap to preserve order of resource requests
  • MAPREDUCE-6387 - Serialize the recently added Task#encryptedSpillKey field at the end
  • MAPREDUCE-6339 - Job history file is not flushed correctly because isTimerActive flag is not set true when flushTimerTask is scheduled.
  • MAPREDUCE-5710 - Backport MAPREDUCE-1305 to branch-1
  • MAPREDUCE-6238 - MR2 can't run local jobs with -libjars command options which is a regression from MR1
  • HBASE-13826 - Unable to create table when group acls are appropriately set.
  • HBASE-13241 - Add tests for group level grants
  • HBASE-13239 - HBase grant at specific column level does not work for Groups
  • HBASE-13768 - ZooKeeper znodes are bootstrapped with insecure ACLs in a secure configuration
  • HBASE-13789 - ForeignException should not be sent to the client
  • HBASE-13779 - Calling table.exists() before table.get() end up with an empty Result
  • HBASE-13780 - Default to 700 for HDFS root dir permissions for secure deployments
  • HBASE-13768 - ZooKeeper znodes are bootstrapped with insecure ACLs in a secure configuration
  • HBASE-13767 - Allow ZKAclReset to set and not just clear ZK ACLs
  • HBASE-13086 - Show ZK root node on Master WebUI
  • HBASE-13342 - Fix incorrect interface annotations
  • HBASE-13162 - Add capability for cleaning hbase acls to hbase cleanup script.
  • HBASE-12641 - Grant all permissions of hbase zookeeper node to hbase superuser in a secure cluster
  • HBASE-13374 - Small scanners (with particular configurations) do not return all rows
  • HBASE-13269 - Limit result array preallocation to avoid OOME with large scan caching values
  • HBASE-13422 - remove use of StandardCharsets in 0.98
  • HBASE-13335 - Update ClientSmallScanner and ClientSmallReversedScanner
  • HBASE-13262 - ResultScanner doesn't return all rows in Scan
  • HIVE-10841 - [WHERE col is not null] does not work sometimes for queries with many JOIN statements
  • HIVE-9620 - Cannot retrieve column statistics using HMS API if column name contains uppercase characters
  • HIVE-8863 - Cannot drop table with uppercase name after "compute statistics for columns"
  • HIVE-6679 - HiveServer2 should support configurable the server side socket timeout and keepalive for various transports types where applicable
  • OOZIE-1944 - Recursive variable resolution broken when same parameter name in config-default and action conf
  • OOZIE-2218 - META-INF directories in the war file have 777 permissions
  • SENTRY-540 - Fix Sentry test validating special chars in username due to HIVE-8916
  • SENTRY-227 - Fix for "Unsupported entity type DUMMYPARTITION"
  • SOLR-7478 - UpdateLog#close shutdown it's executor with interrupts before running close, preventing a clean close.
  • SOLR-7338 - A reloaded core will never register itself as active after a ZK session expiration
  • SOLR-7370 - FSHDFSUtils#recoverFileLease tries to recover the lease every one second after the first four second wait.
  • ZOOKEEPER-2146 - BinaryInputArchive readString should check length before allocating memory
  • ZOOKEEPER-2149 - Logging of client address when socket connection established
  • IMPALA-1726: Move JNI / Thrift utilities to separate header
  • IMPALA-2002: Provide way to cache ext data source classes

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