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add sling copy scripts, properties adjustments
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Oct 2, 2024
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161 changes: 161 additions & 0 deletions
161
scripts/clickhouse_import_support/copy_mysql_database_tables_to_clickhouse.sh
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| #!/usr/bin/env bash | ||
|
|
||
| # load dependencies | ||
| unset this_script_dir | ||
| this_script_dir="$(dirname "$(readlink -f $0)")" | ||
| if ! source "$this_script_dir/parse_property_file_functions.sh" ; then | ||
| echo "Error : unable to load dependency : $this_script_dir/parse_property_file_functions.sh" >&2 | ||
| exit 1 | ||
| fi | ||
| if ! source "$this_script_dir/sling_command_line_functions.sh" ; then | ||
| echo "Error : unable to load dependency : $this_script_dir/sling_command_line_functions.sh" >&2 | ||
| exit 1 | ||
| fi | ||
| unset this_script_dir | ||
|
|
||
| function usage() { | ||
| echo "usage:" | ||
| } | ||
|
|
||
| # other non-local environment variables in use | ||
| unset my_properties | ||
| unset database_table_list | ||
| unset clickhouse_destination_database_name | ||
| unset mysql_source_database_name | ||
| declare -A my_properties | ||
| declare -a database_table_list | ||
| declare -A table_has_been_copied_and_verified | ||
| clickhouse_destination_database_name="" | ||
| mysql_source_database_name="" | ||
| database_table_list_filepath="$(pwd)/cmd_database_table_list.txt" | ||
|
|
||
| function initialize_main() { | ||
| if ! [ "$database_to_transfer" == "blue" ] && ! [ "$database_to_transfer" == "green" ] ; then | ||
| echo "Error : argument for database_to_transfer must be either 'blue' or 'green'" >&2 | ||
| return 1 | ||
| fi | ||
| if ! parse_property_file "$properties_filepath" my_properties ; then | ||
| usage | ||
| return 1 | ||
| fi | ||
| if [ "$database_to_transfer" == "blue" ] ; then | ||
| clickhouse_destination_database_name="${my_properties['clickhouse_blue_database_name']}" | ||
| mysql_source_database_name="${my_properties['mysql_blue_database_name']}" | ||
| else | ||
| clickhouse_destination_database_name="${my_properties['clickhouse_green_database_name']}" | ||
| mysql_source_database_name="${my_properties['mysql_green_database_name']}" | ||
| fi | ||
| if ! initialize_sling_command_line_functions "$database_to_transfer" ; then | ||
| usage | ||
| return 1 | ||
| fi | ||
| remove_credentials_from_properties my_properties | ||
| } | ||
|
|
||
| function destination_database_exists_and_is_empty() { | ||
| if ! clickhouse_database_exists "$clickhouse_destination_database_name" ; then | ||
| echo "Error : could not proceed with database copying because destination database does not exist: $clickhouse_destination_database_name" >&2 | ||
| return 1 | ||
| fi | ||
| if ! clickhouse_database_is_empty "$clickhouse_destination_database_name" ; then | ||
| echo "Error : could not proceed with database copying because destination database is not empty: $clickhouse_destination_database_name" >&2 | ||
| return 2 | ||
| fi | ||
| return 0 | ||
| } | ||
|
|
||
| function set_database_table_list() { | ||
| local statement="SELECT table_name FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE' AND table_schema='$mysql_source_database_name'" | ||
| rm -f "$database_table_list_filepath" | ||
| if ! execute_sql_statement_via_sling "$statement" "mysql" "$database_table_list_filepath" ; then | ||
| echo "Warning : failed to execute mysql statement : $statement" >&2 | ||
| return 1 | ||
| fi | ||
| unset sql_data_array | ||
| if ! set_sql_data_array_from_file "$database_table_list_filepath" 0 ; then | ||
| return 1 | ||
| fi | ||
| database_table_list=(${sql_data_array[@]}) | ||
| return 0 | ||
| } | ||
|
|
||
| function shutdown_main_and_clean_up() { | ||
| #TODO restore | ||
| #shutdown_sling_command_line_functions | ||
| delete_output_stream_files | ||
| unset my_properties | ||
| unset database_table_list | ||
| unset table_has_been_copied_and_verified | ||
| unset database_table_list_filepath | ||
| unset record_count_comparison_filepath | ||
| } | ||
|
|
||
| function successful_copy_verified_flag_has_been_set() { | ||
| local table_name=$1 | ||
| if [ "${table_has_been_copied_and_verified[$table_name]}" == "true" ] ; then | ||
| return 0 | ||
| fi | ||
| return 1 | ||
| } | ||
|
|
||
| function set_successful_copy_verified_flag() { | ||
| local table_name=$1 | ||
| table_has_been_copied_and_verified[$table_name]="true" | ||
| } | ||
|
|
||
| function copy_all_database_tables_with_sling() { | ||
| local pos=0 | ||
| local exit_status=0 | ||
| while [ $pos -lt ${#database_table_list[@]} ] ; do | ||
| table_name="${database_table_list[$pos]}" | ||
| if successful_copy_verified_flag_has_been_set "$table_name" ; then | ||
| # table successfully copied on a previous pass | ||
| continue | ||
| fi | ||
| echo "attempting to copy data in table $table_name using sling" | ||
| if ! transfer_table_data_via_sling "$mysql_source_database_name" "$clickhouse_destination_database_name" "$table_name" "TODOdeletefile" ; then | ||
| echo "Warning : failure to copy table $table_name" >&2 | ||
| exit_status=1 # any failed table copies cause an eventual failure status to be returned | ||
| else | ||
| if ! destination_table_matches_source_table "$table_name" ; then | ||
| echo "Warning : failure to verify copy of table $table_name" >&2 | ||
| exit_status=1 # any failed table copies cause an eventual failure status to be returned | ||
| else | ||
| set_successful_copy_verified_flag "$table_name" | ||
| fi | ||
| fi | ||
| pos=$(($pos+1)) | ||
| done | ||
| return $exit_status | ||
| } | ||
|
|
||
| function copy_all_database_tables_with_sling_allow_retry() { | ||
| local remaining_try_count=3 | ||
| while [ $remaining_try_count -ne 0 ] ; do | ||
| #TODO record iteration start timestamp | ||
| if copy_all_database_tables_with_sling ; then | ||
| return 0 | ||
| fi | ||
| #TODO pause for the minimum try duration (5 minutes?) | ||
| remaining_try_count=$((remaining_try_count-1)) | ||
| done | ||
| return 1 | ||
| } | ||
|
|
||
| function main() { | ||
| local properties_filepath=$1 | ||
| local database_to_transfer=$2 | ||
| local exit_status=0 | ||
| if ! initialize_main "$properties_filepath" "$database_to_transfer" || | ||
| ! destination_database_exists_and_is_empty || | ||
| ! set_database_table_list || | ||
| ! copy_all_database_tables_with_sling_allow_retry ; then | ||
| exit_status=1 | ||
| fi | ||
| shutdown_main_and_clean_up | ||
| return $exit_status | ||
| } | ||
|
|
||
| main "$1" "$2" | ||
|
|
||
| exit 0 |
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