Knowledge is Power
Source: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.1/bk_administration/content/distcp_between_ha_clusters.html DistCp Between HA Clusters To copy data between HA clusters, use the dfs.internal.nameservices property in the hdfs-site.xml file to explicitly specify the name services belonging to the local cluster, while continuing to use the dfs.nameservices property to specify all of the name services in...
Bash function to export Hive table data to local CSV file Usage: hive_export_csv <db.table> <output.csv> [queue] Recommendation: Add to .bash_profile hive_export_csv () { if [ -z “$2” ]; then echo “Bad arguments. Usage: ${FUNCNAME[0]} <db.table> <output.csv> [queue]” else uuid=$(uuidgen)...
Source: https://community.hortonworks.com/questions/112754/insert-overwrite-directory-beeline.html Error Error: Error while compiling statement: FAILED: HiveAccessControlException Permission denied: user [user] does not have [WRITE] privilege on [/tmp/*] (state=42000,code=40000) The above error appears, even though you’ve setup ranger policies, hdfs policies are set up. You’ve checked everything and...
Source: http://marcel.is/how-newline-can-ruin-your-hive/ If you do not fully understand how Hive/Impala stores your data, it might cost you badly. Symptom #1: Weird values in ingested Hive table You double-checked with select distinct(gender) from customers that the gender column in your source RDBMS really contains only values male, female and NULL....
Find record having max value for a field Get latest record from Elasticsearch Latest record with ES _timestamp value in results Get record count from last x mins Max value GET http://elasticsearch-server:9200/my_index_name_*/_search?size=0 { “aggs” : { “max_timestamp” : { “max”...
Source: https://docs.hortonworks.com/HDPDocuments/SS1/SmartSense-1.4.0/bk_installation/content/SSL_troubleshooting.html SmartSense SSL Troubleshooting SmartSense components use SSL for protecting communications between the HST server and agents, and between the HST server and SmartSense Gateway. If installation issues arise, you can reset these SSL certificates. HST Server To reset the...
Source: https://discuss.pivotal.io/hc/en-us/articles/203272527-Namenode-failed-while-loading-fsimage-with-GC-overhead-limit-exceeded Namenode failed while loading fsimage with GC overhead limit exceeded Problem During startup namenode failed to load fsimage into memory 2014-05-14 17:36:56,806 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Loading image file /data/hadoop/nn/dfs/name/current/fsimage_0000000000252211550 using no compression 2014-05-14 17:36:56,806 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Number of files =...
Source: https://github.com/caesar0301/awesome-public-datasets Awesome Public Datasets This list of public data sources are collected and tidied from blogs, answers, and user responses. Most of the data sets listed below are free, however, some are not. Other amazingly awesome lists can be found...
Below python code will help you extract statistics from a set of Sqoop log files for transfer analysis, #!/usr/bin/env python import fnmatch import os import datetime def find_files(directory, pattern): for root, dirs, files in os.walk(directory): for basename in files: if...
Hive meaning Teradata meaning .net BCL Type TINYINT 1-byte signed integer, from -128 to 127 ByteInt Represents a 8-bit (1-byte) signed integer. Range: -128 to 127 System.Int16 SMALLINT 2-byte signed integer, from -32,768 to 32,767 SmallInt Represents a 16-bit (2-Byte) signed integer. Range: -32,768 to 32,767...
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