224 lines
11 KiB
Bash
224 lines
11 KiB
Bash
export PYTHON_EGG_CACHE=/home/$(whoami)/.python-eggs
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export link_folder=/tmp/impala-shell-python-egg-cache-$(whoami)
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if ! [ -L $link_folder ]
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then
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rm -Rf "$link_folder"
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ln -sfn ${PYTHON_EGG_CACHE}${link_folder} ${link_folder}
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fi
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export HADOOP_USER_NAME=$2
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# Set the active HDFS node of OCEAN and IMPALA cluster.
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OCEAN_HDFS_NODE='hdfs://nameservice1'
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echo -e "\nOCEAN HDFS virtual-name which resolves automatically to the active-node: ${OCEAN_HDFS_NODE}"
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IMPALA_HDFS_NODE=''
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COUNTER=0
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while [ $COUNTER -lt 3 ]; do
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if hdfs dfs -test -e hdfs://impala-cluster-mn1.openaire.eu/tmp >/dev/null 2>&1; then
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IMPALA_HDFS_NODE='hdfs://impala-cluster-mn1.openaire.eu:8020'
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break
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elif hdfs dfs -test -e hdfs://impala-cluster-mn2.openaire.eu/tmp >/dev/null 2>&1; then
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IMPALA_HDFS_NODE='hdfs://impala-cluster-mn2.openaire.eu:8020'
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break
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else
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IMPALA_HDFS_NODE=''
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sleep 1
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fi
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((COUNTER++))
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done
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if [ -z "$IMPALA_HDFS_NODE" ]; then
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echo -e "\n\nERROR: PROBLEM WHEN SETTING THE HDFS-NODE FOR IMPALA CLUSTER! | AFTER ${COUNTER} RETRIES.\n\n"
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exit 1
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fi
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echo -e "Active IMPALA HDFS Node: ${IMPALA_HDFS_NODE} , after ${COUNTER} retries.\n\n"
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IMPALA_HOSTNAME='impala-cluster-dn1.openaire.eu'
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IMPALA_CONFIG_FILE='/etc/impala_cluster/hdfs-site.xml'
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IMPALA_HDFS_DB_BASE_PATH="${IMPALA_HDFS_NODE}/user/hive/warehouse"
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# Set sed arguments.
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LOCATION_HDFS_NODE_SED_ARG="s|${OCEAN_HDFS_NODE}|${IMPALA_HDFS_NODE}|g" # This requires to be used with "sed -e" in order to have the "|" delimiter (as the "/" conflicts with the URIs)
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# Set the SED command arguments for column-names with reserved words:
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DATE_SED_ARG_1='s/[[:space:]]\date[[:space:]]/\`date\`/g'
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DATE_SED_ARG_2='s/\.date,/\.\`date\`,/g' # the "date" may be part of a larger field name like "datestamp" or "date_aggregated", so we need to be careful with what we are replacing.
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DATE_SED_ARG_3='s/\.date[[:space:]]/\.\`date\` /g'
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HASH_SED_ARG_1='s/[[:space:]]\hash[[:space:]]/\`hash\`/g'
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HASH_SED_ARG_2='s/\.hash,/\.\`hash\`,/g'
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HASH_SED_ARG_3='s/\.hash[[:space:]]/\.\`hash\` /g'
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LOCATION_SED_ARG_1='s/[[:space:]]\location[[:space:]]/\`location\`/g'
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LOCATION_SED_ARG_2='s/\.location,/\.\`location\`,/g'
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LOCATION_SED_ARG_3='s/\.location[[:space:]]/\.\`location\` /g'
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function copydb() {
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db=$1
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echo -e "\nStart processing db: '${db}'..\n"
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# Delete the old DB from Impala cluster (if exists).
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "drop database if exists ${db} cascade" |& tee error.log # impala-shell prints all logs in stderr, so wee need to capture them and put them in a file, in order to perform "grep" on them later
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log_errors=`cat error.log | grep -E "WARN|ERROR|FAILED"`
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if [ -n "$log_errors" ]; then
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echo -e "\n\nERROR: THERE WAS A PROBLEM WHEN DROPPING THE OLD DATABASE! EXITING...\n\n"
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rm -f error.log
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return 1
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fi
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# Make Impala aware of the deletion of the old DB immediately.
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sleep 1
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "INVALIDATE METADATA"
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echo -e "\n\nCopying files of '${db}', from Ocean to Impala cluster..\n"
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# Using max-bandwidth of: 50 * 100 Mb/s = 5 Gb/s
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# Using max memory of: 50 * 6144 = 300 Gb
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# Using 1MB as a buffer-size.
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# The " -Ddistcp.dynamic.recordsPerChunk=50" arg is not available in our version of hadoop
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# The "ug" args cannot be used as we get a "User does not belong to hive" error.
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# The "p" argument cannot be used, as it blocks the files from being used, giving a "sticky bit"-error, even after applying chmod and chown onm the files.
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hadoop distcp -Dmapreduce.map.memory.mb=6144 -m 70 -bandwidth 150 \
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-numListstatusThreads 40 \
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-copybuffersize 1048576 \
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-strategy dynamic \
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-pb \
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${OCEAN_HDFS_NODE}/user/hive/warehouse/${db}.db ${IMPALA_HDFS_DB_BASE_PATH}
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# Check the exit status of the "hadoop distcp" command.
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if [ $? -eq 0 ]; then
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echo -e "\nSuccessfully copied the files of '${db}'.\n"
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else
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echo -e "\n\nERROR: FAILED TO TRANSFER THE FILES OF '${db}', WITH 'hadoop distcp'. GOT WITH EXIT STATUS: $?\n\n"
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rm -f error.log
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return 2
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fi
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# In case we ever use this script for a writable DB (using inserts/updates), we should perform the following costly operation as well..
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#hdfs dfs -conf ${IMPALA_CONFIG_FILE} -chmod -R 777 ${TEMP_SUBDIR_FULLPATH}/${db}.db
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echo -e "\nCreating schema for db: '${db}'\n"
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# create the new database (with the same name)
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "create database ${db}"
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# Make Impala aware of the creation of the new DB immediately.
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sleep 1
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "INVALIDATE METADATA"
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sleep 1
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# Because "Hive" and "Impala" do not have compatible schemas, we cannot use the "show create table <name>" output from hive to create the exact same table in impala.
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# So, we have to find at least one parquet file (check if it's there) from the table in the ocean cluster for impala to use it to extract the table-schema itself from that file.
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all_create_view_statements=()
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entities_on_ocean=`hive -e "show tables in ${db};" | sed 's/WARN:.*//g'` # Get the tables and views without any potential the "WARN" logs.
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for i in ${entities_on_ocean[@]}; do # Use un-quoted values, as the elemetns are single-words.
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# Check if this is a view by showing the create-statement where it should print "create view" for a view, not the "create table". Unfortunately, there is no "show views" command.
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create_entity_statement=`hive -e "show create table ${db}.${i};"` # It needs to happen in two stages, otherwise the "grep" is not able to match multi-line statement.
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create_view_statement_test=`echo -e "$create_entity_statement" | grep 'CREATE VIEW'`
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if [ -n "$create_view_statement_test" ]; then
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echo -e "\n'${i}' is a view, so we will save its 'create view' statement and execute it on Impala, after all tables have been created.\n"
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create_view_statement=`echo -e "$create_entity_statement" | sed 's/WARN:.*//g' | sed 's/\`//g' \
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| sed 's/"$/;/' | sed 's/^"//' | sed 's/\\"\\"/\"/g' | sed -e "${LOCATION_HDFS_NODE_SED_ARG}" | sed "${DATE_SED_ARG_1}" | sed "${HASH_SED_ARG_1}" | sed "${LOCATION_SED_ARG_1}" \
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| sed "${DATE_SED_ARG_2}" | sed "${HASH_SED_ARG_2}" | sed "${LOCATION_SED_ARG_2}" \
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| sed "${DATE_SED_ARG_3}" | sed "${HASH_SED_ARG_3}" | sed "${LOCATION_SED_ARG_3}"`
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all_create_view_statements+=("$create_view_statement")
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else
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echo -e "\n'${i}' is a table, so we will check for its parquet files and create the table on Impala cluster.\n"
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CURRENT_PRQ_FILE=`hdfs dfs -conf ${IMPALA_CONFIG_FILE} -ls -C "${IMPALA_HDFS_DB_BASE_PATH}/${db}.db/${i}/" | grep -v 'Found' | grep -v '_impala_insert_staging' | head -1`
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if [ -z "$CURRENT_PRQ_FILE" ]; then # If there is not parquet-file inside.
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echo -e "\nERROR: THE TABLE \"${i}\" HAD NO FILES TO GET THE SCHEMA FROM! IT'S EMPTY!\n\n"
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else
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "create table ${db}.${i} like parquet '${CURRENT_PRQ_FILE}' stored as parquet;" |& tee error.log
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log_errors=`cat error.log | grep -E "WARN|ERROR|FAILED"`
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if [ -n "$log_errors" ]; then
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echo -e "\n\nERROR: THERE WAS A PROBLEM WHEN CREATING TABLE '${i}'!\n\n"
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fi
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fi
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fi
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done
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echo -e "\nAll tables have been created, going to create the views..\n"
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# Time to loop through the views and create them.
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# At this point all table-schemas should have been created.
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previous_num_of_views_to_retry=${#all_create_view_statements}
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if [[ $previous_num_of_views_to_retry -gt 0 ]]; then
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echo -e "\nAll_create_view_statements:\n\n${all_create_view_statements[@]}\n" # DEBUG
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# Make Impala aware of the new tables, so it knows them when creating the views.
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sleep 1
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "INVALIDATE METADATA"
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sleep 1
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else
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echo -e "\nDB '${db}' does not contain any views.\n"
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fi
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level_counter=0
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while [[ ${#all_create_view_statements[@]} -gt 0 ]]; do
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((level_counter++))
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# The only accepted reason for a view to not be created, is if it depends on another view, which has not been created yet.
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# In this case, we should retry creating this particular view again.
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should_retry_create_view_statements=()
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for create_view_statement in "${all_create_view_statements[@]}"; do # Here we use double quotes, as the elements are phrases, instead of single-words.
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "${create_view_statement}" |& tee error.log # impala-shell prints all logs in stderr, so wee need to capture them and put them in a file, in order to perform "grep" on them later
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specific_errors=`cat error.log | grep -E "FAILED: ParseException line 1:13 missing TABLE at 'view'|ERROR: AnalysisException: Could not resolve table reference:"`
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if [ -n "$specific_errors" ]; then
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echo -e "\nspecific_errors: ${specific_errors}\n"
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echo -e "\nView '$(cat error.log | grep "CREATE VIEW " | sed 's/CREATE VIEW //g' | sed 's/ as select .*//g')' failed to be created, possibly because it depends on another view.\n"
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should_retry_create_view_statements+=("$create_view_statement")
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else
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sleep 1 # Wait a bit for Impala to register that the view was created, before possibly referencing it by another view.
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fi
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done
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new_num_of_views_to_retry=${#should_retry_create_view_statements}
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if [[ $new_num_of_views_to_retry -eq $previous_num_of_views_to_retry ]]; then
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echo -e "\n\nERROR: THE NUMBER OF VIEWS TO RETRY HAS NOT BEEN REDUCED! THE SCRIPT IS LIKELY GOING TO AN INFINITE-LOOP! EXITING..\n\n"
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return 3
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elif [[ $new_num_of_views_to_retry -gt 0 ]]; then
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echo -e "\nTo be retried \"create_view_statements\":\n\n${should_retry_create_view_statements[@]}\n"
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previous_num_of_views_to_retry=$new_num_of_views_to_retry
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else
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echo -e "\nFinished creating views, for db: '${db}', in level-${level_counter}.\n"
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fi
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all_create_view_statements=("${should_retry_create_view_statement[@]}") # This is needed in any case to either move forward with the rest of the views or stop at 0 remaining views.
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done
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sleep 1
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "INVALIDATE METADATA"
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sleep 1
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echo -e "\nComputing stats for tables..\n"
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entities_on_impala=`impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`
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for i in ${entities_on_impala[@]}; do # Use un-quoted values, as the elemetns are single-words.
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# Taking the create table statement from the Ocean cluster, just to check if its a view, as the output is easier than using impala-shell from Impala cluster.
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create_view_statement=`hive -e "show create table ${db}.${i};" | grep "CREATE VIEW"` # This grep works here, as we do not want to match multiple-lines.
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if [ -z "$create_view_statement" ]; then # If it's a table, then go load the data to it.
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impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "compute stats ${db}.${i}";
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fi
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done
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if [ "${entities_on_impala[@]}" == "${entities_on_ocean[@]}" ]; then
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echo -e "\nAll entities have been copied to Impala cluster.\n"
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else
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echo -e "\n\nERROR: 1 OR MORE ENTITIES OF DB '${db}' FAILED TO BE COPIED TO IMPALA CLUSTER!\n\n"
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rm -f error.log
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return 4
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fi
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rm -f error.log
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echo -e "\n\nFinished processing db: ${db}\n\n"
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}
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MONITOR_DB=$1
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#HADOOP_USER_NAME=$2
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copydb $MONITOR_DB
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