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79 lines
2.2 KiB
Bash
79 lines
2.2 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2019-12-10 11:33:52 +0000 (Tue, 10 Dec 2019)
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#
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# https://github.com/HariSekhon/DevOps-Bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/HariSekhon
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#
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# you will almost certainly have to comment out / remove '-o pipefail' to skip authorization errors such as that documented in impala_list_tables.sh
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set -eu # -o pipefail
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[ -n "${DEBUG:-}" ] && set -x
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srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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# shellcheck disable=SC1090,SC1091
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Print each table's DDL metadata field eg. Location
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Output Format:
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<db>.<table> <field>
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FILTER environment variable will restrict to matching fully qualified tables (<db>.<table>)
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Caveats:
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Hive is more reliable as Impala breaks on some table metadata definitions where Hive doesn't
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Impala is faster than Hive for the first ~1000 tables but then slows down
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so if you have a lot of tables I recommend you use the Hive version of this instead
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Tested on Impala 2.7.0, 2.12.0 on CDH 5.10, 5.16 with Kerberos and SSL
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For more documentation see the comments at the top of impala_shell.sh
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For a better version written in Python see DevOps Python tools repo:
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https://github.com/HariSekhon/DevOps-Python-tools
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<metadata_field> [<impala_shell_options>]"
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help_usage "$@"
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min_args 1 "$@"
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field="$1"
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shift || :
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query_template="describe formatted {table}"
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# exit the loop subshell if you Control-C
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trap 'exit 130' INT
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"$srcdir/impala_list_tables.sh" "$@" |
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while read -r db table; do
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printf '%s.%s\t' "$db" "$table"
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query="${query_template//\{db\}/\`$db\`}"
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query="${query//\{table\}/\`$table\`}"
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{ "$srcdir/impala_shell.sh" --quiet -Bq "USE \`$db\`; $query" "$@" || echo "ERROR running query: $query" >&2; } |
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{ grep "^$field" || echo UNKNOWN; } |
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sed "s/^$field:[[:space:]]*//; s/[[:space:]]*NULL[[:space:]]*$//"
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done
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