* Remove references to Berkeley DB, including most of the
troubleshooting section. W00t.
This commit is contained in:
Eelco Dolstra
parent
f5325d292d
commit
07d3a38726
4 changed files with 17 additions and 143 deletions
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@ -60,27 +60,6 @@ env-keep-derivations = false
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</varlistentry>
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<varlistentry xml:id="conf-gc-reserved-space"><term><literal>gc-reserved-space</literal></term>
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<listitem><para>This option specifies how much space should be
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reserved in normal use so that the garbage collector can run
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succesfully. Since the garbage collector must perform Berkeley DB
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transactions, it needs some disk space for itself. However, when
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the disk is full, this space is not available, so the collector
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would not be able to run precisely when it is most needed.</para>
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<para>For this reason, when Nix is run, it allocates a file
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<filename>/nix/var/nix/db/reserved</filename> of the size
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specified by this option. When the garbage collector is run, this
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file is deleted before the Berkeley DB environment is opened.
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This should give it enough room to proceed.</para>
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<para>The default is <literal>1048576</literal> (1
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MiB).</para></listitem>
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</varlistentry>
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<varlistentry><term><literal>env-keep-derivations</literal></term>
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<listitem><para>If <literal>false</literal> (default), derivations
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@ -96,18 +96,23 @@ ubiquitous 2.5.4a won't. Note that these are only required if you
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modify the parser or when you are building from the Subversion
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repository.</para>
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<para>Nix uses Sleepycat's Berkeley DB, CWI's ATerm library and the
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bzip2 compressor (including the bzip2 library). These are included in
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the Nix source distribution. If you build from the Subversion
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repository, you must download them yourself and place them in the
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<para>Nix uses CWI's ATerm library and the bzip2 compressor (including
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the bzip2 library). These are included in the Nix source
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distribution. If you build from the Subversion repository, you must
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download them yourself and place them in the
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<filename>externals/</filename> directory. See
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<filename>externals/Makefile.am</filename> for the precise URLs of
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these packages. Alternatively, if you already have them installed,
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you can use <command>configure</command>'s
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<option>--with-bdb</option>, <option>--with-aterm</option> and
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<option>--with-bzip2</option> options to point to their respective
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locations. Note that Berkeley DB <emphasis>must</emphasis> be version
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4.5; other versions may not have compatible database formats.</para>
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<option>--with-aterm</option> and <option>--with-bzip2</option>
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options to point to their respective locations.</para>
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<para>If you want to be able to upgrade Nix stores from before version
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0.12pre12020, you need Sleepycat's Berkeley DB version version 4.5.
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(Other versions may not have compatible database formats.). Berkeley
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DB 4.5 is included in the Nix source distribution. If you do not need
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this ability, you can build Nix with the
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<option>--disable-old-db-compat</option> configure option.</para>
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</section>
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@ -87,7 +87,7 @@ $ rm __db* log.* derivers references referrers reserved validpaths DB_CONFIG</sc
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upgrading, instead of setting an exclusive lock on the profile.
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This allows multiple <command>nix-env -i / -u / -e</command>
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operations on the same profile in parallel. If a
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<command>nix-env</command> operation sees at th end that the profile
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<command>nix-env</command> operation sees at the end that the profile
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was changed in the meantime by another process, it will just
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restart. This is generally cheap because the build results are
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still in the Nix store.</para></listitem>
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@ -171,7 +171,7 @@ the following paths will be downloaded/copied (30.02 MiB):
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<literal>nix-store --import <
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closure</literal>.</para></listitem>
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<listitem><para>Lots of bugfixes, including a big performance bug in
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<listitem><para>Lots of bug fixes, including a big performance bug in
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the handling of <literal>with</literal>-expressions.</para></listitem>
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</itemizedlist>
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@ -9,117 +9,6 @@ the <link xlink:href="http://bugs.strategoxt.org/browse/NIX">Nix
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bug tracker</link> for a list of currently known issues.</para>
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<section><title>Berkeley DB: <quote>Cannot allocate memory</quote></title>
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<para>Symptom: Nix operations (in particular the
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<command>nix-store</command> operations <option>--gc</option>,
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<option>--verify</option>, and <option>--clear-substitutes</option> —
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the latter being called by <command>nix-channel --update</command>)
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failing:
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<screen>
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$ nix-store --verify
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error: Db::del: Cannot allocate memory</screen>
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</para>
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<para>Possible solution: make sure that no Nix processes are running,
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then do:
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<screen>
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$ cd /nix/var/nix/db
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$ rm __db.00*</screen>
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</para>
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</section>
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<section><title>Berkeley DB gives weird error messages</title>
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<para>Symptom: you get error messages such as
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<screen>
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Berkeley DB message: Finding last valid log LSN: file: 1 offset 28
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Berkeley DB error: file validpaths (meta pgno = 0) has LSN [483][34721].
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Berkeley DB error: end of log is [1][28]
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Berkeley DB error: /nix/var/nix/db/validpaths: unexpected file type or format</screen>
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or other weird Berkeley DB errors, and they don’t go away (i.e.,
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automatic recovery doesn’t work). This may be the case after a system
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crash.</para>
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<para>Solution: first try to run <command>db_recover</command> and
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then <link linkend='refsec-nix-store-verify'><command>nix-store
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--verify</command></link>:
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<screen>
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$ db_recover -h /nix/var/nix/db
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$ nix-store --verify</screen>
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(Make sure that you have the right version of
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<command>db_recover</command>, namely, Berkeley DB 4.4 for Nix 0.10,
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and 4.5 for Nix 0.11.)</para>
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<para>If that doesn’t work, it’s time to bring out the big guns:
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<screen>
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$ cd /nix/var/nix
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$ cp -pr db db-backup <lineannotation>(making a backup just in case)</lineannotation>
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$ cd db
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$ rm __db.* log* <lineannotation>(removing the Berkeley DB environment)</lineannotation>
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$ mkdir tmp
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$ for i in *; do db_dump $i | (cd tmp && db_load $i); done
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<lineannotation>(ignore error messages about non-database files like “reserved”)</lineannotation>
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$ mv tmp/* .
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$ nix-store --verify</screen>
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</para>
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</section>
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<section><title>Berkeley DB out of locks</title>
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<para>It is possible, especially in <command>nix-store
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--verify</command> or when running the garbage collector, to run out
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of Berkeley DB locks, like this:
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<screen>
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$ nix-store --verify
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checking path existence
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checking path realisability
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checking the derivers table
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checking the references table
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Berkeley DB error: Lock table is out of available object entries
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error: Db::get: Cannot allocate memory</screen>
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</para>
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<para>A workaround is to increase the number of locks that Berkeley DB
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allocates. (The real solution would be for Nix to not use so many
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locks.) This can be done by putting the following in the file
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<filename>/nix/var/nix/db/<link
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xlink:href="http://www.oracle.com/technology/documentation/berkeley-db/db/ref/env/db_config.html">DB_CONFIG</link></filename>:
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<programlisting>
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set_lk_max_locks 100000
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set_lk_max_lockers 100000
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set_lk_max_objects 100000
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</programlisting>
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(Increase these numbers if necessary.) Then make sure that there are
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no running Nix processes and delete the Berkeley DB environment:
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<screen>
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$ rm /nix/var/nix/db/__db.*</screen>
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The Berkeley DB environment is automatically recreated with the new
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limits when you run any Nix command.</para>
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</section>
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<section><title>Collisions in <command>nix-env</command></title>
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<para>Symptom: when installing or upgrading, you get an error message such as
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@ -187,7 +76,8 @@ Furthermore, the <literal>st_nlink</literal> field of the
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<para>This only happens on very large Nix installations (such as build
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machines).</para>
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<para>Quick solution: run the garbage collector.</para>
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<para>Quick solution: run the garbage collector. You may want to use
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the <option>--max-links</option> option.</para>
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<para>Real solution: put the Nix store on a file system that supports
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more than 32,000 subdirectories per directory, such as ReiserFS.
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