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From Karl Wright <daddy...@gmail.com>
Subject Re: Timeout problems with web crawling
Date Wed, 24 Apr 2013 09:29:29 GMT
I updated the ticket as well; all the EXPLAIN queries are very fast at the
moment.  The reason is that the checktime value you used needs to be the
current time or larger, which is why I picked

1466628406182

Karl



On Wed, Apr 24, 2013 at 4:53 AM, Erlend Garåsen <e.f.garasen@usit.uio.no>wrote:

>
> 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<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<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>
>>         <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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