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annotate design.txt @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 9ce3b26798c4
children 2fadf8695f8a
rev   line source
1
a3576694a4d1 Repository detection from local/specified directory
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1 FileStructureWalker (pass HgFile, HgFolder to callable; which can ask for VCS data from any file)
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2 External uses: user browses files, selects one and asks for its history
a3576694a4d1 Repository detection from local/specified directory
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3 Params: tip/revision;
a3576694a4d1 Repository detection from local/specified directory
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4 Implementation: manifest
a3576694a4d1 Repository detection from local/specified directory
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5
a3576694a4d1 Repository detection from local/specified directory
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6 Log --rev
a3576694a4d1 Repository detection from local/specified directory
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7 Log <file>
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08db726a0fb7 Shaping out low-level Hg structures
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8 HgDataFile.history() or Changelog.history(file)?
08db726a0fb7 Shaping out low-level Hg structures
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9
08db726a0fb7 Shaping out low-level Hg structures
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10
08db726a0fb7 Shaping out low-level Hg structures
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11 Changelog.all() to return list with placeholder, not-parsed elements (i.e. read only compressedLen field and skip to next record), so that
08db726a0fb7 Shaping out low-level Hg structures
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12 total number of elements in the list is correct
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a3576694a4d1 Repository detection from local/specified directory
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a3576694a4d1 Repository detection from local/specified directory
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14 hg cat
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15 Implementation: logic to find file by name in the repository is the same with Log and other commands
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16
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17
08db726a0fb7 Shaping out low-level Hg structures
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18 Revlog
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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19 What happens when big entry is added to a file - when it detects it can't longer fit into .i and needs .d? Inline flag and .i format changes?
aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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20
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603806cd2dc6 Status of local working dir against non-tip base revision
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21 What's hg natural way to see nodeids of specific files (i.e. when I do 'hg --debug manifest -r 11' and see nodeid of some file, and
603806cd2dc6 Status of local working dir against non-tip base revision
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22 then would like to see what changeset this file came from)?
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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23
aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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24 ----------
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5abe5af181bd Ant script to build commands and run sample
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25 + support patch from baseRev + few deltas (although done in a way patches are applied one by one instead of accumulated)
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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26 + command-line samples (-R, filenames) (Log & Cat) to show on any repo
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5abe5af181bd Ant script to build commands and run sample
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27 +buildfile + run samples
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d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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28 *input stream impl + lifecycle. Step forward with FileChannel and ByteBuffer, although questionable accomplishment (looks bit complicated, cumbersome)
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442dc6ee647b Show correct time
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29 + dirstate.mtime
43
1b26247d7367 Calculate result length of the patch operarion, when unknown
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30 +calculate sha1 digest for file to see I can deal with nodeid. +Do this correctly (smaller nodeid - first)
18
02ee376bee79 status operation against current working directory
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31 *.hgignored processing
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da8ccbfae64d Reflect Nodeid's array is exactly 20
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32 +Nodeid to keep 20 bytes always, Revlog.Inspector to get nodeid array of meaningful data exact size (nor heading 00 bytes, nor 12 extra bytes from the spec)
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71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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33 +DataAccess - implement memory mapped files,
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26e3eeaa3962 branch and user filtering for log operation
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34 +Changeset to get index (local revision number)
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613c936d74e4 Log operation to output mode detailed (added, removed) files
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35 +RevisionWalker (on manifest) and WorkingCopyWalker (io.File) talking to ? and/or dirstate (StatusCollector and WCSC)
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36 +RevlogStream - Inflater. Perhaps, InflaterStream instead? branch:wrap-data-access
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37 +repo.status - use same collector class twice, difference as external code. add external walker that keeps collected maps and use it in Log operation to give files+,files-
78
c25c5c348d1b Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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38 + strip \1\n metadata out from RevlogStream
84
08754fce5778 updated design questions
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39 + hash/digest long names for fncache
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8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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40 +Strip off metadata from beg of the stream - DataAccess (with rebase/moveBaseOffset(int)) would be handy
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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41 + hg status, compare revision and local file with kw expansion and eol extension
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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43 write code to convert inlined revlog to .i and .d
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613c936d74e4 Log operation to output mode detailed (added, removed) files
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44
613c936d74e4 Log operation to output mode detailed (added, removed) files
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45 delta merge
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46 DataAccess - collect debug info (buffer misses, file size/total read operations) to find out better strategy to buffer size detection. Compare performance.
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858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
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48
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44b97930570c Introduced ChangelogHelper to look up changesets files were modified in
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49 Parameterize StatusCollector to produce copy only when needed. And HgDataFile.metadata perhaps should be moved to cacheable place?
44b97930570c Introduced ChangelogHelper to look up changesets files were modified in
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02ee376bee79 status operation against current working directory
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51 Status operation from GUI - guess, usually on a file/subfolder, hence API should allow for starting path (unlike cmdline, seems useless to implement include/exclide patterns - GUI users hardly enter them, ever)
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613c936d74e4 Log operation to output mode detailed (added, removed) files
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52 -> recently introduced FileWalker may perhaps help solving this (if starts walking from selected folder) for status op against WorkingDir?
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08754fce5778 updated design questions
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54 ? Can I use fncache (names from it - perhaps, would help for Mac issues Alex mentioned)
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55 ? Does fncache lists both .i and .d (iow, is it true hashed <long name>.d is different from hashed <long name>.i)
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56
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865bf07f381f Basic hgignore handling
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57 ??? encodings of fncache, .hgignore, dirstate
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254078595653 Print manifest nodeid
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58 ??? http://mercurial.selenic.com/wiki/Manifest says "Multiple changesets may refer to the same manifest revision". To me, each changeset
254078595653 Print manifest nodeid
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59 changes repository, hence manifest should update nodeids of the files it lists, effectively creating new manifest revision.
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865bf07f381f Basic hgignore handling
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19e9e220bf68 Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
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61 ? subrepos in log, status (-S) and manifest commands
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3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
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63 ? when p1 == -1, and p2 != -1, does HgStatusCollector.change() give correct result?
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d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
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64
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65 Commands to get CommandContext where they may share various caches (e.g. StatusCollector)
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d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
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66 Perhaps, abstract classes for all Inspectors (i.e. StatusCollector.Inspector) for users to use as base classes to protect from change?
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67
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68 -cancellation and progress support
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69 -timestamp check for revlog to recognize external changes
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9ce3b26798c4 Few branches (distinct BranchChains from distinct heads) may end up with same nodes. Building BC structure fixed to reuse chain elements
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70 -HgDate or any other better access to time info
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71 -(low) RepositoryComparator#calculateMissingBranches may query branches for the same head more than once
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72 (when there are few heads that end up with common nodes). e.g hg4j revision 7 against remote hg4j revision 206
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73
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74 >>>> Effective file read/data access
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75 ReadOperation, Revlog does: repo.getFileSystem().run(this.file, new ReadOperation(), long start=0, long end = -1)
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76 ReadOperation gets buffer (of whatever size, as decided by FS impl), parses it and then reports if needs more data.
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77 This helps to ensure streams are closed after reading, allows caching (if the same file (or LRU) is read few times in sequence)
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78 and allows buffer management (i.e. reuse. Single buffer for all reads).
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79 Scheduling multiple operations (in future, to deal with writes - single queue for FS operations - no locks?)
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81 WRITE: Need to register instances that cache files (e.g. dirstate or .hgignore) to FS notifier, so that cache may get cleared if the file changes (i.e. WriteOperation touches it).
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82
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83 File access:
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84 * NIO and mapped files - should be fast. Although seems to give less control on mem usage.
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e929cecae4e1 Refactor to move revlog content to base class
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85 * Regular InputStreams and chunked stream on top - allocate List<byte[]>, each (but last) chunk of fixed size (depending on initial file size)
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86
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645829962785 core.Cset renamed to HgChangeset; repo.Changeset moved into HgChangelog
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88 * API
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89 + rename in .core Cset -> HgChangeset,
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90 + rename in .repo Changeset to HgChangelog.Changeset, Changeset.Inspector -> HgChangelog.Inspector
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91 - CommandContext
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92 - Data access - not bytes, but ByteChannel
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93 - HgRepository constants (TIP, BAD, WC) to HgRevisions enum
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aa1629f36482 Renamed .core classes to start with Hg prefix
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94 - RevisionMap to replace TreeMap<Integer, ?>
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95 + .core.* rename to Hg*
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96 + RepositoryTreeWalker to ManifestCommand to match other command classes
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97
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98 * defects
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947bf231acbb Strip off comments in config file
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99 + ConfigFile to strip comments from values (#)
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101 <<<<<
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102 Performance.
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103 after pooling/caching in HgStatusCollector and HgChangeset
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104 hg log --debug -r 0:5000 and same via Log/HgLogCommand: approx. 220 seconds vs 279 seconds. Mem. cons. 20 vs 80 mb.
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105 after further changes in HgStatusCollector (to read ahead 5 elements, 50 max cache, fixed bug with -1) - hg4j dumps 5000 in
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106 93 seconds, memory consumption about 50-56 Mb
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107
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108 IndexEntry(int offset, int baseRevision) got replaced with int[] arrays (offsets - optional)
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109 for 69338 revisions from cpython repo 1109408 bytes reduced to 277368 bytes with the new int[] version.
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110 I.e. total for changelog+manifest is 1,5 Mb+ gain
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111
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112 ParentWalker got arrays (Nodeid[] and int[]) instead of HashMap/LinkedHashSet. This change saves, per revision:
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113 was: LinkedHashSet$Entry:32 + HashMap$Entry:24 + HashMap.entries[]:4 (in fact, up to 8, given entries size is power of 2, and 69000+
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114 elements in cpython test repo resulted in entries[131072].
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115 total: (2 HashMaps) 32+(24+4)*2 = 88 bytes
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116 now: Nodeid[]:4 , int[]:4 bytes per entry. arrays of exact revlog size
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117 total: (4 Nodeid[], 1 int[]) 4*4 + 4 = 20 bytes
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118 for cpython test repo with 69338 revisions, 1 387 224 instead of 4 931 512 bytes. Mem usage (TaskManager) ~50 Mb when 10000 revs read
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119
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3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
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120 <<<<<
26
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121
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122 Tests:
61
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123 DataAccess - readBytes(length > memBufferSize, length*2 > memBufferSize) - to check impl is capable to read huge chunks of data, regardless of own buffer size
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124
129
645829962785 core.Cset renamed to HgChangeset; repo.Changeset moved into HgChangelog
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125 ExecHelper('cmd', OutputParser()).run(). StatusOutputParser, LogOutputParser extends OutputParser. construct java result similar to that of cmd, compare results
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126
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127 Need better MethodRule than ErrorCollector for tests run as java app (to print not only MultipleFailureException, but distinct errors)
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128 Also consider using ExternalResource and TemporaryFolder rules.