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  22.   | Mercurial 3.4 Released
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  56.   <h2 class="blog_post_title"><a href="/blog/2015/05/04/mercurial-3.4-released" rel="bookmark" title="Permanent Link to Mercurial 3.4 Released">Mercurial 3.4 Released</a></h2>
    57. 

  57.   <small>May 04, 2015 at 12:40 PM | categories: 
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  58. 

  59. <a href='/blog/category/mercurial'>Mercurial</a>, <a href='/blog/category/mozilla'>Mozilla</a>
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  60. </small><p/>
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  61.   <div class="post_prose">
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  62.     
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  63.   <p>Mercurial 3.4 was released on May 1 (following Mercurial's time-based
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  64. schedule of releasing a new version every 3 months).</p>
    65. 

  65. <p>3.4 is a significant release for a few reasons.</p>
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  66. <p>First, the next version of the wire protocol (<em>bundle2</em>) has been
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  67. marked as non-experimental on servers. This version of the protocol
    68. 

  68. paves over a number of deficiencies in the classic protocol. I won't
    69. 

  69. go into low-level details. But I will say that the protocol enables
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  70. some rich end-user experiences, such as having the server hand out URLs
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  71. for pre-generated bundles (e.g. offload clones to S3), atomic push
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  72. operations, and advanced workflows, such as having the server rebase
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  73. automatically on push. Of course, you'll need a server running 3.4
    74. 

  74. to realize the benefits of the new protocol. hg.mozilla.org won't be
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  75. updated until at least June 1.</p>
    76. 

  76. <p>Second, Mercurial 3.4 contains improvements to the tags cache to make
    77. 

  77. performance concerns a thing of the past. Due to the structure of the
    78. 

  78. Firefox repositories, the previous implementation of the tags cache
    79. 

  79. could result in pauses of dozens of seconds during certain workflows.
    80. 

  80. The problem should go away with Mercurial 3.4. <strong>Please note that on
    81. 

  81. first use of Mercurial 3.4, your repository may perform a one-time
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  82. upgrade of the tags cache. This will spin a full CPU core and will
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  83. take up to a few minutes to complete on Firefox repos. Let it run to
    84. 

  84. completion and performance should not be an issue again.</strong> I wrote the
    85. 

  85. patches to change the tags cache (with lots of help from Pierre-Yves
    86. 

  86. David, a Mercurial core contributor). So if you find anything wrong,
    87. 

  87. I'm the one to complain to.</p>
    88. 

  88. <p>Third, the HTTP interface to Mercurial (hgweb) now has JSON output
    89. 

  89. for nearly every endpoint. The implementation isn't yet complete,
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  90. but it is better than nothing. But, it should be good enough for
    91. 

  91. services to start consuming it. Again, this won't be available on
    92. 

  92. hg.mozilla.org until the server is upgraded on June 1 at the earliest.
    93. 

  93. This is a feature I added to core Mercurial. If you have feature
    94. 

  94. requests, send them my way.</p>
    95. 

  95. <p>Fourth, a number of performance regressions introduced in Mercurial
    96. 

  96. 3.3 were addressed. These performance issues frequently manifested
    97. 

  97. during <em>hg blame</em> operations. Many Mozillians noticed them on
    98. 

  98. hg.mozilla.org when looking at blame through the web interface.</p>
    99. 

  99. <p>For a more comprehensive list of changes, see
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  100. <a href="https://groups.google.com/d/msg/mozilla.dev.version-control/z4aWvBoAGYw/d0hUGKJU_psJ">my post about the 3.4 RC</a>
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  101. and the
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  102. <a href="http://mercurial.selenic.com/wiki/WhatsNew#Mercurial_3.4_.282015-05-01.29">official release notes</a>.</p>
    103. 

  103. <p>3.4 was a significant release. There are compelling reasons to upgrade.
    104. 

  104. That being said, there were a lot of changes in 3.4. If you want to wait
    105. 

  105. until 3.4.1 is released (scheduled for June 1) so you don't run into
    106. 

  106. any regressions, nobody can fault you for that.</p>
    107. 

  107. <p>If you want to upgrade, I recommend reading the
    108. 

  108. <a href="https://mozilla-version-control-tools.readthedocs.org/en/latest/hgmozilla/installing.html">Mercurial for Mozillians Installation Page</a>.</p>
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  171.   <p>Copyright (c) 2012- Gregory Szorc. All rights reserved. Design by <a href="http://www.freecsstemplates.org/"> CSS Templates</a>.</p>
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