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From "Damien Katz (JIRA)" <j...@apache.org>
Subject [jira] Closed: (COUCHDB-78) CouchDB crashed Erland
Date Thu, 12 Jun 2008 18:24:45 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-78?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Damien Katz closed COUCHDB-78.
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.8
         Assignee: Damien Katz

Problem was couchdb failing to close file handles during compaction reattempts. Fixed in revision
667188.

Note, it is not a good idea to attempt compaction on a database is near full capacity for
its write load. The problem is the compaction process may never catch up with the writes if
they never let up, and eventually it will run out of disk space.

Compaction should be attempted when the write load is less than full capacity. Read load won't
affect its ability to complete however.

> CouchDB crashed Erland
> ----------------------
>
>                 Key: COUCHDB-78
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-78
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>    Affects Versions: 0.8
>         Environment: Linux 2.6.25.4-30.fc9.i686 #1 SMP Wed May 21 18:12:35 EDT 2008 i686
i686 i386 GNU/Linux
>            Reporter: Sergey Kurtsev
>            Assignee: Damien Katz
>             Fix For: 0.8
>
>         Attachments: erl_crash.dump
>
>
> Not sure if this is a CouchDB or Erlang bug or both. Please, forward to Erland team if
appropriate.
> What happened:
> I've started several thousands of atomic inserts with modified sample php script from
http://wiki.apache.org/couchdb/GettingStartedWithPhp
> In the middle of insert loop I initiated database compact from localhost:5984/_utils
interface.
> Several thousands of inserts later CouchDB dumped the following error and terminated:
> [ ...similar successfull POSTs are cut 'till this point... ]
> [info] [<0.23823.0>] 127.0.0.1 - - "POST /test" 201
> [info] [<0.91.0>] Compaction file still behind main file (update seq=8728. compact
update seq=8727). Retrying.
> [info] [<0.23830.0>] 127.0.0.1 - - "POST /test" 201
> [info] [<0.91.0>] Compaction file still behind main file (update seq=8729. compact
update seq=8728). Retrying.
> [error] [emulator] Error in process <0.23848.0> with exit value: {{case_clause,{error,{{badmatch,{error,emfile}},[{couch_file,init,1},{gen_server,init_it,6},{proc_lib,init_p,5}]}}},[{couch_db,start_copy_compact_int,2}]}
> =ERROR REPORT==== 12-Jun-2008::19:06:07 ===
> Error in process <0.23848.0> with exit value: {{case_clause,{error,{{badmatch,{error,emfile}},[{couch_file,init,1},{gen_server,init_it,6},{proc_lib,init_p,5}]}}},[{couch_db,start_copy_compact_int,2}]}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,child_terminated},
>       {reason,
>           {{case_clause,
>                {error,
>                    {{badmatch,{error,emfile}},
>                     [{couch_file,init,1},
>                      {gen_server,init_it,6},
>                      {proc_lib,init_p,5}]}}},
>            [{couch_db,start_copy_compact_int,2}]}},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,start_error},
>       {reason,file_exists},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,start_error},
>       {reason,file_exists},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,start_error},
>       {reason,file_exists},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> [info] [<0.23837.0>] HTTP Error (code 500): {'EXIT',
>                         {{{case_clause,
>                            {error,
>                             {{badmatch,{error,emfile}},
>                              [{couch_file,init,1},
>                               {gen_server,init_it,6},
>                               {proc_lib,init_p,5}]}}},
>                           [{couch_db,start_copy_compact_int,2}]},
>                          {gen_server,call,
>                           [<0.90.0>,
>                            {update_docs,
>                             [[{doc,"a2f6aac30a31e34aedc253ae17c3eaa2",
>                                ["4020863542"],
>                                {obj,[{"index",5777},{"data","Foo"}]},
>                                [],false,[]}]],
>                             [new_edits]}]}}}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,start_error},
>       {reason,file_exists},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> [error] [<0.47.0>] {error_report,<0.22.0>,
>     {<0.47.0>,supervisor_report,
>      [{supervisor,{local,couch_server_sup}},
>       {errorContext,start_error},
>       {reason,file_exists},
>       {offender,
>           [{pid,<0.90.0>},
>            {name,"test"},
>            {mfa,
>                {couch_db,create,
>                    ["test","/usr/local/var/lib/apache-couchdb/test.couch",
>                     []]}},
>            {restart_type,transient},
>            {shutdown,infinity},
>            {child_type,supervisor}]}]}}
> {"init terminating in do_boot",shutdown}

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