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Miscellaneous updates to the copying operation to Impala Cluster: 

- Update the algorithm for creating views that depend on other views.
- Add check for successful execution of the "hadoop distcp" command.
- Add a check for successful copy operation of all entities.
- Upon facing an error in a DB, exit the method, instead of the whole script.
- Improve logging.
- Code polishing.
This commit is contained in:
Lampros Smyrnaios 2024-04-12 15:36:13 +03:00
parent 22745027c8
commit 14719dcd62
4 changed files with 160 additions and 80 deletions
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60
dhp-workflows/dhp-stats-hist-snaps/src/main/resources/eu/dnetlib/dhp/oa/graph/stats-hist-snaps/oozie_app/copyDataToImpalaCluster.sh
View File

@ -66,7 +66,7 @@ function copydb() {
if [ -n "$log_errors" ]; then
echo -e "\n\nTHERE WAS A PROBLEM WHEN DROPPING THE OLD DATABASE! EXITING...\n\n"
rm -f error.log
exit 2
return 1
fi
# Make Impala aware of the deletion of the old DB immediately.
@ -87,6 +87,15 @@ function copydb() {
-pb \
${OCEAN_HDFS_NODE}/user/hive/warehouse/${db}.db ${IMPALA_HDFS_DB_BASE_PATH}
# Check the exit status of the "hadoop distcp" command.
if [ $? -eq 0 ]; then
echo "Successfully copied the files of '${db}'."
else
echo "Failed to transfer the files of '${db}', with 'hadoop distcp'. Got with exit status: $?"
rm -f error.log
return 2
fi
# In case we ever use this script for a writable DB (using inserts/updates), we should perform the following costly operation as well..
#hdfs dfs -conf ${IMPALA_CONFIG_FILE} -chmod -R 777 ${TEMP_SUBDIR_FULLPATH}/${db}.db
@ -104,7 +113,8 @@ function copydb() {
all_create_view_commands=()
for i in `hive -e "show tables in ${db};" | sed 's/WARN:.*//g'`; do # Get the tables and views without any potential the "WARN" logs.
entities_on_ocean=`hive -e "show tables in ${db};" | sed 's/WARN:.*//g'` # Get the tables and views without any potential the "WARN" logs.
for i in ${entities_on_ocean[@]}; do # Use un-quoted values, as the elemetns are single-words.
# Check if this is a view by showing the create-command where it should print "create view" for a view, not the "create table". Unfortunately, there is now "show views" command.
create_entity_command=`hive -e "show create table ${db}.${i};"` # It needs to happen in two stages, otherwise the "grep" is not able to match multi-line command.
@ -140,45 +150,44 @@ function copydb() {
# Time to loop through the views and create them.
# At this point all table-schemas should have been created.
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n\n" # DEBUG
should_retry=1 # Should retry creating the views (in case their tables where not created before them).
# There are views of other views as well, so we may have 3,4,5 nested-view and need to retry..
previous_num_of_views_to_retry=${#all_create_view_commands}
if [[ $previous_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n" # DEBUG
else
echo -e "\nDB '${db}' does not contain views.\n"
fi
while ((should_retry)); do
level_counter=0
while [[ ${#all_create_view_commands[@]} -gt 0 ]]; do
((level_counter++))
# The only accepted reason for a view to not be created, is if it depends on another view, which has not been created yet.
# In this case, we should retry creating this particular view again.
should_retry=0 # We should NOT do another iteration, unless at least one view could NOT be created.
should_retry_create_view_commands=()
for create_view_command in "${all_create_view_commands[@]}"; do # Get the tables and views without any potential the "WARN" logs.
for create_view_command in "${all_create_view_commands[@]}"; do # Here we use double quotes, as the elements are phrases, instead of single-words.
impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "${create_view_command}" |& 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
specific_errors=`cat error.log | grep -E "FAILED: ParseException line 1:13 missing TABLE at 'view'|ERROR: AnalysisException: Could not resolve table reference:"`
echo -e "\nspecific_errors: ${specific_errors}\n"
if [ -n "$specific_errors" ]; then
echo -e "\nspecific_errors: ${specific_errors}\n"
echo -e "\nView '$(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"
should_retry=1
should_retry_create_view_commands+=("$create_view_command")
else
sleep 1 # Wait a bit for Impala to register that the view was created, before possibly referencing it by another view.
fi
done
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
new_num_of_views_to_retry=${#should_retry_create_view_commands}
if [[ $new_num_of_views_to_retry -eq $previous_num_of_views_to_retry ]]; then
echo -e "THE NUMBER OF VIEWS TO RETRY HAS NOT BEEN REDUCED! THE SCRIPT IS LIKELY GOING TO AN INFINITE-LOOP! EXITING.."
exit 3
else
return 3
elif [[ $new_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
previous_num_of_views_to_retry=$new_num_of_views_to_retry
else
echo -e "\nFinished creating views db: ${db}, in level-${level_counter}.\n"
fi
all_create_view_commands=$should_retry_create_view_command
all_create_view_commands=("${should_retry_create_view_command[@]}") # This is needed in any case to either move forward with the rest of the views or stop at 0 remaining views.
done
sleep 1
@ -186,7 +195,10 @@ function copydb() {
sleep 1
echo "Computing stats for tables.."
for i in `impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`; do
entities_on_impala=`impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`
for i in ${entities_on_impala[@]}; do # Use un-quoted values, as the elemetns are single-words.
# 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.
create_view_command=`hive -e "show create table ${db}.${i};" | grep "CREATE VIEW"` # This grep works here, as we do not want to match multiple-lines.
if [ -z "$create_view_command" ]; then # If it's a table, then go load the data to it.
@ -194,6 +206,14 @@ function copydb() {
fi
done
if [ "${entities_on_impala[@]}" == "${entities_on_ocean[@]}" ]; then
echo -e "\nAll entities have been copied to Impala cluster.\n"
else
echo -e "\n\n1 OR MORE ENTITIES OF DB '${db}' FAILED TO BE COPIED TO IMPALA CLUSTER!\n\n"
rm -f error.log
return 4
fi
rm -f error.log
echo -e "\n\nFinished processing db: ${db}\n\n"

60
dhp-workflows/dhp-stats-monitor-irish/src/main/resources/eu/dnetlib/dhp/oa/graph/stats-monitor-irish/oozie_app/copyDataToImpalaCluster.sh
View File

@ -65,7 +65,7 @@ function copydb() {
if [ -n "$log_errors" ]; then
echo -e "\n\nTHERE WAS A PROBLEM WHEN DROPPING THE OLD DATABASE! EXITING...\n\n"
rm -f error.log
exit 2
return 1
fi
# Make Impala aware of the deletion of the old DB immediately.
@ -86,6 +86,15 @@ function copydb() {
-pb \
${OCEAN_HDFS_NODE}/user/hive/warehouse/${db}.db ${IMPALA_HDFS_DB_BASE_PATH}
# Check the exit status of the "hadoop distcp" command.
if [ $? -eq 0 ]; then
echo "Successfully copied the files of '${db}'."
else
echo "Failed to transfer the files of '${db}', with 'hadoop distcp'. Got with exit status: $?"
rm -f error.log
return 2
fi
# In case we ever use this script for a writable DB (using inserts/updates), we should perform the following costly operation as well..
#hdfs dfs -conf ${IMPALA_CONFIG_FILE} -chmod -R 777 ${TEMP_SUBDIR_FULLPATH}/${db}.db
@ -103,7 +112,8 @@ function copydb() {
all_create_view_commands=()
for i in `hive -e "show tables in ${db};" | sed 's/WARN:.*//g'`; do # Get the tables and views without any potential the "WARN" logs.
entities_on_ocean=`hive -e "show tables in ${db};" | sed 's/WARN:.*//g'` # Get the tables and views without any potential the "WARN" logs.
for i in ${entities_on_ocean[@]}; do # Use un-quoted values, as the elemetns are single-words.
# Check if this is a view by showing the create-command where it should print "create view" for a view, not the "create table". Unfortunately, there is now "show views" command.
create_entity_command=`hive -e "show create table ${db}.${i};"` # It needs to happen in two stages, otherwise the "grep" is not able to match multi-line command.
@ -139,45 +149,44 @@ function copydb() {
# Time to loop through the views and create them.
# At this point all table-schemas should have been created.
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n\n" # DEBUG
should_retry=1 # Should retry creating the views (in case their tables where not created before them).
# There are views of other views as well, so we may have 3,4,5 nested-view and need to retry..
previous_num_of_views_to_retry=${#all_create_view_commands}
if [[ $previous_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n" # DEBUG
else
echo -e "\nDB '${db}' does not contain views.\n"
fi
while ((should_retry)); do
level_counter=0
while [[ ${#all_create_view_commands[@]} -gt 0 ]]; do
((level_counter++))
# The only accepted reason for a view to not be created, is if it depends on another view, which has not been created yet.
# In this case, we should retry creating this particular view again.
should_retry=0 # We should NOT do another iteration, unless at least one view could NOT be created.
should_retry_create_view_commands=()
for create_view_command in "${all_create_view_commands[@]}"; do # Get the tables and views without any potential the "WARN" logs.
for create_view_command in "${all_create_view_commands[@]}"; do # Here we use double quotes, as the elements are phrases, instead of single-words.
impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "${create_view_command}" |& 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
specific_errors=`cat error.log | grep -E "FAILED: ParseException line 1:13 missing TABLE at 'view'|ERROR: AnalysisException: Could not resolve table reference:"`
echo -e "\nspecific_errors: ${specific_errors}\n"
if [ -n "$specific_errors" ]; then
echo -e "\nspecific_errors: ${specific_errors}\n"
echo -e "\nView '$(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"
should_retry=1
should_retry_create_view_commands+=("$create_view_command")
else
sleep 1 # Wait a bit for Impala to register that the view was created, before possibly referencing it by another view.
fi
done
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
new_num_of_views_to_retry=${#should_retry_create_view_commands}
if [[ $new_num_of_views_to_retry -eq $previous_num_of_views_to_retry ]]; then
echo -e "THE NUMBER OF VIEWS TO RETRY HAS NOT BEEN REDUCED! THE SCRIPT IS LIKELY GOING TO AN INFINITE-LOOP! EXITING.."
exit 3
else
return 3
elif [[ $new_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
previous_num_of_views_to_retry=$new_num_of_views_to_retry
else
echo -e "\nFinished creating views db: ${db}, in level-${level_counter}.\n"
fi
all_create_view_commands=$should_retry_create_view_command
all_create_view_commands=("${should_retry_create_view_command[@]}") # This is needed in any case to either move forward with the rest of the views or stop at 0 remaining views.
done
sleep 1
@ -185,7 +194,10 @@ function copydb() {
sleep 1
echo "Computing stats for tables.."
for i in `impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`; do
entities_on_impala=`impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`
for i in ${entities_on_impala[@]}; do # Use un-quoted values, as the elemetns are single-words.
# 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.
create_view_command=`hive -e "show create table ${db}.${i};" | grep "CREATE VIEW"` # This grep works here, as we do not want to match multiple-lines.
if [ -z "$create_view_command" ]; then # If it's a table, then go load the data to it.
@ -193,6 +205,14 @@ function copydb() {
fi
done
if [ "${entities_on_impala[@]}" == "${entities_on_ocean[@]}" ]; then
echo -e "\nAll entities have been copied to Impala cluster.\n"
else
echo -e "\n\n1 OR MORE ENTITIES OF DB '${db}' FAILED TO BE COPIED TO IMPALA CLUSTER!\n\n"
rm -f error.log
return 4
fi
rm -f error.log
echo -e "\n\nFinished processing db: ${db}\n\n"

60
dhp-workflows/dhp-stats-monitor-update/src/main/resources/eu/dnetlib/dhp/oa/graph/stats-monitor/oozie_app/copyDataToImpalaCluster.sh
View File

@ -65,7 +65,7 @@ function copydb() {
if [ -n "$log_errors" ]; then
echo -e "\n\nTHERE WAS A PROBLEM WHEN DROPPING THE OLD DATABASE! EXITING...\n\n"
rm -f error.log
exit 2
return 1
fi
# Make Impala aware of the deletion of the old DB immediately.
@ -86,6 +86,15 @@ function copydb() {
-pb \
${OCEAN_HDFS_NODE}/user/hive/warehouse/${db}.db ${IMPALA_HDFS_DB_BASE_PATH}
# Check the exit status of the "hadoop distcp" command.
if [ $? -eq 0 ]; then
echo "Successfully copied the files of '${db}'."
else
echo "Failed to transfer the files of '${db}', with 'hadoop distcp'. Got with exit status: $?"
rm -f error.log
return 2
fi
# In case we ever use this script for a writable DB (using inserts/updates), we should perform the following costly operation as well..
#hdfs dfs -conf ${IMPALA_CONFIG_FILE} -chmod -R 777 ${TEMP_SUBDIR_FULLPATH}/${db}.db
@ -103,7 +112,8 @@ function copydb() {
all_create_view_commands=()
for i in `hive -e "show tables in ${db};" | sed 's/WARN:.*//g'`; do # Get the tables and views without any potential the "WARN" logs.
entities_on_ocean=`hive -e "show tables in ${db};" | sed 's/WARN:.*//g'` # Get the tables and views without any potential the "WARN" logs.
for i in ${entities_on_ocean[@]}; do # Use un-quoted values, as the elemetns are single-words.
# Check if this is a view by showing the create-command where it should print "create view" for a view, not the "create table". Unfortunately, there is now "show views" command.
create_entity_command=`hive -e "show create table ${db}.${i};"` # It needs to happen in two stages, otherwise the "grep" is not able to match multi-line command.
@ -139,45 +149,44 @@ function copydb() {
# Time to loop through the views and create them.
# At this point all table-schemas should have been created.
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n\n" # DEBUG
should_retry=1 # Should retry creating the views (in case their tables where not created before them).
# There are views of other views as well, so we may have 3,4,5 nested-view and need to retry..
previous_num_of_views_to_retry=${#all_create_view_commands}
if [[ $previous_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n" # DEBUG
else
echo -e "\nDB '${db}' does not contain views.\n"
fi
while ((should_retry)); do
level_counter=0
while [[ ${#all_create_view_commands[@]} -gt 0 ]]; do
((level_counter++))
# The only accepted reason for a view to not be created, is if it depends on another view, which has not been created yet.
# In this case, we should retry creating this particular view again.
should_retry=0 # We should NOT do another iteration, unless at least one view could NOT be created.
should_retry_create_view_commands=()
for create_view_command in "${all_create_view_commands[@]}"; do # Get the tables and views without any potential the "WARN" logs.
for create_view_command in "${all_create_view_commands[@]}"; do # Here we use double quotes, as the elements are phrases, instead of single-words.
impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "${create_view_command}" |& 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
specific_errors=`cat error.log | grep -E "FAILED: ParseException line 1:13 missing TABLE at 'view'|ERROR: AnalysisException: Could not resolve table reference:"`
echo -e "\nspecific_errors: ${specific_errors}\n"
if [ -n "$specific_errors" ]; then
echo -e "\nspecific_errors: ${specific_errors}\n"
echo -e "\nView '$(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"
should_retry=1
should_retry_create_view_commands+=("$create_view_command")
else
sleep 1 # Wait a bit for Impala to register that the view was created, before possibly referencing it by another view.
fi
done
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
new_num_of_views_to_retry=${#should_retry_create_view_commands}
if [[ $new_num_of_views_to_retry -eq $previous_num_of_views_to_retry ]]; then
echo -e "THE NUMBER OF VIEWS TO RETRY HAS NOT BEEN REDUCED! THE SCRIPT IS LIKELY GOING TO AN INFINITE-LOOP! EXITING.."
exit 3
else
return 3
elif [[ $new_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
previous_num_of_views_to_retry=$new_num_of_views_to_retry
else
echo -e "\nFinished creating views db: ${db}, in level-${level_counter}.\n"
fi
all_create_view_commands=$should_retry_create_view_command
all_create_view_commands=("${should_retry_create_view_command[@]}") # This is needed in any case to either move forward with the rest of the views or stop at 0 remaining views.
done
sleep 1
@ -185,7 +194,10 @@ function copydb() {
sleep 1
echo "Computing stats for tables.."
for i in `impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`; do
entities_on_impala=`impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`
for i in ${entities_on_impala[@]}; do # Use un-quoted values, as the elemetns are single-words.
# 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.
create_view_command=`hive -e "show create table ${db}.${i};" | grep "CREATE VIEW"` # This grep works here, as we do not want to match multiple-lines.
if [ -z "$create_view_command" ]; then # If it's a table, then go load the data to it.
@ -193,6 +205,14 @@ function copydb() {
fi
done
if [ "${entities_on_impala[@]}" == "${entities_on_ocean[@]}" ]; then
echo -e "\nAll entities have been copied to Impala cluster.\n"
else
echo -e "\n\n1 OR MORE ENTITIES OF DB '${db}' FAILED TO BE COPIED TO IMPALA CLUSTER!\n\n"
rm -f error.log
return 4
fi
rm -f error.log
echo -e "\n\nFinished processing db: ${db}\n\n"

60
dhp-workflows/dhp-stats-update/src/main/resources/eu/dnetlib/dhp/oa/graph/stats/oozie_app/copyDataToImpalaCluster.sh
View File

@ -67,7 +67,7 @@ function copydb() {
if [ -n "$log_errors" ]; then
echo -e "\n\nTHERE WAS A PROBLEM WHEN DROPPING THE OLD DATABASE! EXITING...\n\n"
rm -f error.log
exit 2
return 1
fi
# Make Impala aware of the deletion of the old DB immediately.
@ -88,6 +88,15 @@ function copydb() {
-pb \
${OCEAN_HDFS_NODE}/user/hive/warehouse/${db}.db ${IMPALA_HDFS_DB_BASE_PATH}
# Check the exit status of the "hadoop distcp" command.
if [ $? -eq 0 ]; then
echo "Successfully copied the files of '${db}'."
else
echo "Failed to transfer the files of '${db}', with 'hadoop distcp'. Got with exit status: $?"
rm -f error.log
return 2
fi
# In case we ever use this script for a writable DB (using inserts/updates), we should perform the following costly operation as well..
#hdfs dfs -conf ${IMPALA_CONFIG_FILE} -chmod -R 777 ${TEMP_SUBDIR_FULLPATH}/${db}.db
@ -105,7 +114,8 @@ function copydb() {
all_create_view_commands=()
for i in `hive -e "show tables in ${db};" | sed 's/WARN:.*//g'`; do # Get the tables and views without any potential the "WARN" logs.
entities_on_ocean=`hive -e "show tables in ${db};" | sed 's/WARN:.*//g'` # Get the tables and views without any potential the "WARN" logs.
for i in ${entities_on_ocean[@]}; do # Use un-quoted values, as the elemetns are single-words.
# Check if this is a view by showing the create-command where it should print "create view" for a view, not the "create table". Unfortunately, there is now "show views" command.
create_entity_command=`hive -e "show create table ${db}.${i};"` # It needs to happen in two stages, otherwise the "grep" is not able to match multi-line command.
@ -141,45 +151,44 @@ function copydb() {
# Time to loop through the views and create them.
# At this point all table-schemas should have been created.
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n\n" # DEBUG
should_retry=1 # Should retry creating the views (in case their tables where not created before them).
# There are views of other views as well, so we may have 3,4,5 nested-view and need to retry..
previous_num_of_views_to_retry=${#all_create_view_commands}
if [[ $previous_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nAll_create_view_commands:\n\n${all_create_view_commands[@]}\n" # DEBUG
else
echo -e "\nDB '${db}' does not contain views.\n"
fi
while ((should_retry)); do
level_counter=0
while [[ ${#all_create_view_commands[@]} -gt 0 ]]; do
((level_counter++))
# The only accepted reason for a view to not be created, is if it depends on another view, which has not been created yet.
# In this case, we should retry creating this particular view again.
should_retry=0 # We should NOT do another iteration, unless at least one view could NOT be created.
should_retry_create_view_commands=()
for create_view_command in "${all_create_view_commands[@]}"; do # Get the tables and views without any potential the "WARN" logs.
for create_view_command in "${all_create_view_commands[@]}"; do # Here we use double quotes, as the elements are phrases, instead of single-words.
impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} -q "${create_view_command}" |& 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
specific_errors=`cat error.log | grep -E "FAILED: ParseException line 1:13 missing TABLE at 'view'|ERROR: AnalysisException: Could not resolve table reference:"`
echo -e "\nspecific_errors: ${specific_errors}\n"
if [ -n "$specific_errors" ]; then
echo -e "\nspecific_errors: ${specific_errors}\n"
echo -e "\nView '$(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"
should_retry=1
should_retry_create_view_commands+=("$create_view_command")
else
sleep 1 # Wait a bit for Impala to register that the view was created, before possibly referencing it by another view.
fi
done
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
new_num_of_views_to_retry=${#should_retry_create_view_commands}
if [[ $new_num_of_views_to_retry -eq $previous_num_of_views_to_retry ]]; then
echo -e "THE NUMBER OF VIEWS TO RETRY HAS NOT BEEN REDUCED! THE SCRIPT IS LIKELY GOING TO AN INFINITE-LOOP! EXITING.."
exit 3
else
return 3
elif [[ $new_num_of_views_to_retry -gt 0 ]]; then
echo -e "\nTo be retried \"create_view_commands\":\n\n${should_retry_create_view_commands[@]}\n"
previous_num_of_views_to_retry=$new_num_of_views_to_retry
else
echo -e "\nFinished creating views db: ${db}, in level-${level_counter}.\n"
fi
all_create_view_commands=$should_retry_create_view_command
all_create_view_commands=("${should_retry_create_view_command[@]}") # This is needed in any case to either move forward with the rest of the views or stop at 0 remaining views.
done
sleep 1
@ -187,7 +196,10 @@ function copydb() {
sleep 1
echo "Computing stats for tables.."
for i in `impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`; do
entities_on_impala=`impala-shell --user ${HADOOP_USER_NAME} -i ${IMPALA_HOSTNAME} --delimited -q "show tables in ${db}"`
for i in ${entities_on_impala[@]}; do # Use un-quoted values, as the elemetns are single-words.
# 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.
create_view_command=`hive -e "show create table ${db}.${i};" | grep "CREATE VIEW"` # This grep works here, as we do not want to match multiple-lines.
if [ -z "$create_view_command" ]; then # If it's a table, then go load the data to it.
@ -195,6 +207,14 @@ function copydb() {
fi
done
if [ "${entities_on_impala[@]}" == "${entities_on_ocean[@]}" ]; then
echo -e "\nAll entities have been copied to Impala cluster.\n"
else
echo -e "\n\n1 OR MORE ENTITIES OF DB '${db}' FAILED TO BE COPIED TO IMPALA CLUSTER!\n\n"
rm -f error.log
return 4
fi
rm -f error.log
echo -e "\n\nFinished processing db: ${db}\n\n"