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From Erlend Garåsen <e.f.gara...@usit.uio.no>
Subject Re: Timeout problems with web crawling
Date Wed, 24 Apr 2013 08:53:45 GMT

Thanks Karl!

I have updated the ticket with the information you requested, but there 
is an email delay at the moment from Jira (or this list).

Erlend

On 24.04.13 01.37, Karl Wright wrote:
> Hi Erlend,
>
> I had a conversation with the PostgreSQL people.  Have a look at ticket
> CONNECTORS-678; you'll want to get an EXPLAIN ANALYZE of the query I
> provided before on the live system - but update the checktime value so
> it catches more than zero records:
>
> EXPLAIN ANALYZE SELECT t0.id <http://t0.id>,t0.jobid,t0.dochash,t0.
> docid,t0.status,t0.failtime,t0.failcount,t0.priorityset FROM jobqueue
> t0  WHERE t0.status IN ('P','G') AND t0.checkaction='R' AND
> t0.checktime<=1566628406182 AND
>      EXISTS(SELECT 'x' FROM jobs t1 WHERE t1.status IN ('A','a') AND
> t1.id <http://t1.id>=t0.jobid AND t1.priority=5) AND
> NOT EXISTS(SELECT 'x' FROM jobqueue t2 WHERE t2.dochash=t0.dochash AND
> t2.status IN ('A','F','a','f','D','d') AND t2.jobid!=t0.jobid) AND
>      NOT EXISTS(SELECT 'x' FROM prereqevents t3,events t4 WHERE t0.id
> <http://t0.id>=t3.owner AND t3.eventname=t4.name <http://t4.name>) ORDER
> BY t0.docpriority ASC LIMIT 100;
>
> I'd also like to see what the contents of your prereqevents table looks
> like on that system.  If you can do SELECT * from prereqevents; , and
> give me the first ten or so that  pop up, I can take it from there.
>
> Karl
>
>
>
> On Tue, Apr 23, 2013 at 10:22 AM, Karl Wright <daddywri@gmail.com
> <mailto:daddywri@gmail.com>> wrote:
>
>     Hi Erlend,
>
>     If you have access to psql and can connect to the production
>     database, I'd like to explore whether the relatively recent change I
>     made for MySQL is in fact breaking PostgreSQL stuffer thread queries.
>
>     First, read this page:
>     http://www.postgresql.org/docs/current/static/indexes-ordering.html
>
>     What we're trying to achieve is that the planner use the index whose
>     first column is docpriority.  The way we will need to determine that
>     is to open up psql, and "explain" the query in question, and then
>     modify the query to see if it begins to plan correctly.
>
>     In psql, you will need to assess the query in question.  To do that,
>     execute the following:
>
>     EXPLAIN SELECT t0.id
>     <http://t0.id>,t0.jobid,t0.dochash,t0.docid,t0.status,t0.failtime,t0.failcount,t0.priorityset
>     FROM jobqueue t0  WHERE t0.status IN ('P','G') AND
>     t0.checkaction='R' AND t0.checktime<=1366628406182 AND
>          EXISTS(SELECT 'x' FROM jobs t1 WHERE t1.status IN ('A','a') AND
>     t1.id <http://t1.id>=t0.jobid AND t1.priority=5) AND
>          NOT EXISTS(SELECT 'x' FROM jobqueue t2 WHERE
>     t2.dochash=t0.dochash AND t2.status IN ('A','F','a','f','D','d') AND
>     t2.jobid!=t0.jobid) AND
>          NOT EXISTS(SELECT 'x' FROM prereqevents t3,events t4 WHERE
>     t0.id <http://t0.id>=t3.owner AND t3.eventname=t4.name
>     <http://t4.name>) ORDER BY t0.docpriority ASC LIMIT 100;
>
>
>     The production job MUST be running or it is a meaningless exercise.
>
>     What you want to see is that the outermost action is NOT a sort;
>     instead, you want an
>
>     Index Scan using i1362584563121
>
>
>     If you get something else, try changing the ORDER BY clause to includeNULLS LAST
orNULLS FIRST to see if that
>
>     changes anything.  If not, I may ask you to execute a sample query or two and tell
me what it returns, so I can assess
>
>       whether the data is messed up in some way.
>
>
>
>     Karl
>
>
>
>
>
>
>     On Tue, Apr 23, 2013 at 10:03 AM, Erlend Garåsen
>     <e.f.garasen@usit.uio.no <mailto:e.f.garasen@usit.uio.no>> wrote:
>
>         On 23.04.13 15.30, Karl Wright wrote:
>
>             What version of Postgresql is this?  Given the same
>             Postgresql version,
>
>
>         9.1.9
>
>         "allow_system_table_mods";"__off"
>         "application_name";"pgAdmin III - Query Tool"
>         "archive_command";"/local/opt/__pgsql-9.1/bin/pgclarchive_wal.__sh
>         -P %p -F %f -S dbpg-search"
>         "archive_mode";"on"
>         "archive_timeout";"0"
>         "array_nulls";"on"
>         "authentication_timeout";"__1min"
>         "autovacuum";"on"
>         "autovacuum_analyze_scale___factor";"0.1"
>         "autovacuum_analyze_threshold"__;"50"
>         "autovacuum_freeze_max_age";"__200000000"
>         "autovacuum_max_workers";"3"
>         "autovacuum_naptime";"1min"
>         "autovacuum_vacuum_cost_delay"__;"20ms"
>         "autovacuum_vacuum_cost_limit"__;"-1"
>         "autovacuum_vacuum_scale___factor";"0.2"
>         "autovacuum_vacuum_threshold";__"50"
>         "backslash_quote";"safe___encoding"
>         "bgwriter_delay";"200ms"
>         "bgwriter_lru_maxpages";"100"
>         "bgwriter_lru_multiplier";"2"
>         "block_size";"8192"
>         "bonjour";"off"
>         "bonjour_name";""
>         "bytea_output";"escape"
>         "check_function_bodies";"on"
>         "checkpoint_completion_target"__;"0.5"
>         "checkpoint_segments";"128"
>         "checkpoint_timeout";"5min"
>         "checkpoint_warning";"30s"
>         "client_encoding";"UNICODE"
>         "client_min_messages";"notice"
>         "commit_delay";"0"
>         "commit_siblings";"5"
>         "constraint_exclusion";"__partition"
>         "cpu_index_tuple_cost";"0.005"
>         "cpu_operator_cost";"0.0025"
>         "cpu_tuple_cost";"0.01"
>         "cursor_tuple_fraction";"0.1"
>         "custom_variable_classes";""
>         "DateStyle";"ISO, MDY"
>         "db_user_namespace";"off"
>         "deadlock_timeout";"1s"
>         "debug_assertions";"off"
>         "debug_pretty_print";"on"
>         "debug_print_parse";"off"
>         "debug_print_plan";"off"
>         "debug_print_rewritten";"off"
>         "default_statistics_target";"__100"
>         "default_tablespace";""
>         "default_text_search_config";"__pg_catalog.english"
>         "default_transaction___deferrable";"off"
>         "default_transaction___isolation";"read committed"
>         "default_transaction_read___only";"off"
>         "default_with_oids";"off"
>         "effective_cache_size";"__16093MB"
>         "effective_io_concurrency";"1"
>         "enable_bitmapscan";"on"
>         "enable_hashagg";"on"
>         "enable_hashjoin";"on"
>         "enable_indexscan";"on"
>         "enable_material";"on"
>         "enable_mergejoin";"on"
>         "enable_nestloop";"on"
>         "enable_seqscan";"on"
>         "enable_sort";"on"
>         "enable_tidscan";"on"
>         "escape_string_warning";"on"
>         "exit_on_error";"off"
>         "extra_float_digits";"0"
>         "from_collapse_limit";"8"
>         "fsync";"on"
>         "full_page_writes";"on"
>         "geqo";"on"
>         "geqo_effort";"5"
>         "geqo_generations";"0"
>         "geqo_pool_size";"0"
>         "geqo_seed";"0"
>         "geqo_selection_bias";"2"
>         "geqo_threshold";"12"
>         "gin_fuzzy_search_limit";"0"
>         "hot_standby";"off"
>         "hot_standby_feedback";"off"
>         "ignore_system_indexes";"off"
>         "integer_datetimes";"on"
>         "IntervalStyle";"postgres"
>         "join_collapse_limit";"8"
>         "krb_caseins_users";"off"
>         "krb_srvname";"postgres"
>         "lc_collate";"C"
>         "lc_ctype";"C"
>         "lc_messages";"C"
>         "lc_monetary";"C"
>         "lc_numeric";"C"
>         "lc_time";"C"
>         "listen_addresses";"dbpg-__search.uio.no
>         <http://dbpg-search.uio.no>"
>         "lo_compat_privileges";"off"
>         "local_preload_libraries";""
>         "log_autovacuum_min_duration";__"-1"
>         "log_checkpoints";"off"
>         "log_connections";"off"
>         "log_destination";"stderr"
>         "log_disconnections";"off"
>         "log_duration";"off"
>         "log_error_verbosity";"__default"
>         "log_executor_stats";"off"
>         "log_file_mode";"0600"
>         "log_hostname";"off"
>         "log_line_prefix";"[%m] [dbpg-search] [%d:%u] [%r] [%p] [%x] "
>         "log_lock_waits";"off"
>         "log_min_duration_statement";"__-1"
>         "log_min_error_statement";"__info"
>         "log_min_messages";"notice"
>         "log_parser_stats";"off"
>         "log_planner_stats";"off"
>         "log_rotation_age";"0"
>         "log_rotation_size";"0"
>         "log_statement";"none"
>         "log_statement_stats";"off"
>         "log_temp_files";"-1"
>         "log_timezone";"Europe/Oslo"
>         "log_truncate_on_rotation";"__on"
>         "logging_collector";"on"
>         "maintenance_work_mem";"128MB"
>         "max_connections";"600"
>         "max_files_per_process";"1000"
>         "max_function_args";"100"
>         "max_identifier_length";"63"
>         "max_index_keys";"32"
>         "max_locks_per_transaction";"__64"
>         "max_pred_locks_per___transaction";"64"
>         "max_prepared_transactions";"__0"
>         "max_stack_depth";"4MB"
>         "max_standby_archive_delay";"__30s"
>         "max_standby_streaming_delay";__"30s"
>         "max_wal_senders";"0"
>         "password_encryption";"on"
>         "port";"5432"
>         "post_auth_delay";"0"
>         "pre_auth_delay";"0"
>         "quote_all_identifiers";"off"
>         "random_page_cost";"2"
>         "replication_timeout";"1min"
>         "restart_after_crash";"on"
>         "search_path";""$user",public"
>         "segment_size";"1GB"
>         "seq_page_cost";"1"
>         "server_encoding";"UTF8"
>         "server_version";"9.1.9"
>         "server_version_num";"90109"
>         "session_replication_role";"__origin"
>         "shared_buffers";"384MB"
>         "silent_mode";"off"
>         "sql_inheritance";"on"
>         "ssl";"on"
>         "ssl_renegotiation_limit";"__512MB"
>         "standard_conforming_strings";__"off"
>         "statement_timeout";"0"
>         "superuser_reserved___connections";"3"
>         "synchronize_seqscans";"on"
>         "synchronous_commit";"on"
>         "synchronous_standby_names";""
>         "syslog_facility";"local0"
>         "syslog_ident";"postgres"
>         "tcp_keepalives_count";"9"
>         "tcp_keepalives_idle";"7200"
>         "tcp_keepalives_interval";"75"
>         "temp_buffers";"8MB"
>         "temp_tablespaces";""
>         "TimeZone";"Europe/Oslo"
>         "timezone_abbreviations";"__Default"
>         "trace_notify";"off"
>         "trace_recovery_messages";"__log"
>         "trace_sort";"off"
>         "track_activities";"on"
>         "track_activity_query_size";"__1024"
>         "track_counts";"on"
>         "track_functions";"none"
>         "transaction_deferrable";"off"
>         "transaction_isolation";"read committed"
>         "transaction_read_only";"off"
>         "transform_null_equals";"off"
>         "unix_socket_group";""
>         "unix_socket_permissions";"__0700"
>         "update_process_title";"on"
>         "vacuum_cost_delay";"0"
>         "vacuum_cost_limit";"200"
>         "vacuum_cost_page_dirty";"20"
>         "vacuum_cost_page_hit";"1"
>         "vacuum_cost_page_miss";"10"
>         "vacuum_defer_cleanup_age";"0"
>         "vacuum_freeze_min_age";"__50000000"
>         "vacuum_freeze_table_age";"__150000000"
>         "wal_block_size";"8192"
>         "wal_buffers";"12MB"
>         "wal_keep_segments";"0"
>         "wal_level";"archive"
>         "wal_receiver_status_interval"__;"10s"
>         "wal_segment_size";"16MB"
>         "wal_sender_delay";"1s"
>         "wal_sync_method";"fdatasync"
>         "wal_writer_delay";"200ms"
>         "work_mem";"16MB"
>         "xmlbinary";"base64"
>         "xmloption";"content"
>         "zero_damaged_pages";"off"
>
>
>
>         --
>         Erlend Garåsen
>         Center for Information Technology Services
>         University of Oslo
>         P.O. Box 1086 Blindern, N-0317 OSLO, Norway
>         Ph: (+47) 22840193 <tel:%28%2B47%29%2022840193>, Fax: (+47)
>         22852970 <tel:%28%2B47%29%2022852970>, Mobile: (+47) 91380968
>         <tel:%28%2B47%29%2091380968>, VIP: 31050
>
>
>


-- 
Erlend Garåsen
Center for Information Technology Services
University of Oslo
P.O. Box 1086 Blindern, N-0317 OSLO, Norway
Ph: (+47) 22840193, Fax: (+47) 22852970, Mobile: (+47) 91380968, VIP: 31050

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