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| <h1 class="title">Decommission Bookies</h1> |
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| <p>In case the user wants to decommission a bookie, the following process is useful to follow in order to verify if the |
| decommissioning was safely done.</p> |
| |
| <h3 id="before-we-decommission">Before we decommission</h3> |
| <ol> |
| <li> |
| <p>Ensure state of your cluster can support the decommissioning of the target bookie. |
| Check if <code class="highlighter-rouge">EnsembleSize >= Write Quorum >= Ack Quorum</code> stays true with one less bookie</p> |
| </li> |
| <li> |
| <p>Ensure target bookie shows up in the listbookies command.</p> |
| </li> |
| <li> |
| <p>Ensure that there is no other process ongoing (upgrade etc).</p> |
| </li> |
| </ol> |
| |
| <h3 id="process-of-decommissioning">Process of Decommissioning</h3> |
| <ol> |
| <li>Log on to the bookie node, check if there are underreplicated ledgers.</li> |
| </ol> |
| |
| <p>If there are, the decommission command will force them to be replicated. |
| <code class="highlighter-rouge">$ bin/bookkeeper shell listunderreplicated</code></p> |
| |
| <ol> |
| <li> |
| <p>Stop the bookie |
| <code class="highlighter-rouge">$ bin/bookkeeper-daemon.sh stop bookie</code></p> |
| </li> |
| <li> |
| <p>Run the decommission command. |
| If you have logged onto the node you wish to decommission, you don’t need to provide <code class="highlighter-rouge">-bookieid</code> |
| If you are running the decommission command for target bookie node from another bookie node you should mention |
| the target bookie id in the arguments for <code class="highlighter-rouge">-bookieid</code> |
| <code class="highlighter-rouge">$ bin/bookkeeper shell decommissionbookie</code> |
| or |
| <code class="highlighter-rouge">$ bin/bookkeeper shell decommissionbookie -bookieid <target bookieid></code></p> |
| </li> |
| <li> |
| <p>Validate that there are no ledgers on decommissioned bookie |
| <code class="highlighter-rouge">$ bin/bookkeeper shell listledgers -bookieid <target bookieid></code></p> |
| </li> |
| </ol> |
| |
| <p>Last step to verify is you could run this command to check if the bookie you decommissioned doesn’t show up in list bookies:</p> |
| |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>./bookkeeper shell listbookies <span class="nt">-rw</span> <span class="nt">-h</span> |
| ./bookkeeper shell listbookies <span class="nt">-ro</span> <span class="nt">-h</span> |
| </code></pre></div></div> |
| |
| </section> |
| |
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| <div class="column is-2 is-hidden-mobile"> |
| |
| |
| <div class="toc"> |
| <h2 class="title">Decommission Bookies</h2> |
| <ul class="section-nav"> |
| <li class="toc-entry toc-h3"><a href="#before-we-decommission">Before we decommission</a></li> |
| <li class="toc-entry toc-h3"><a href="#process-of-decommissioning">Process of Decommissioning</a></li> |
| </ul> |
| </div> |
| |
| |
| |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div id="entry-popover-html" class="popover-template"> |
| <p>An entry is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Entries are also known as records.</p> |
| |
| </div> |
| |
| <div id="ledger-popover-html" class="popover-template"> |
| <p>A ledger is a sequence of entries written to BookKeeper. Entries are written sequentially to ledgers and at most once, giving ledgers append-only semantics.</p> |
| |
| </div> |
| |
| <div id="bookie-popover-html" class="popover-template"> |
| <p>A bookie is an individual BookKeeper storage server.</p> |
| |
| <p>Bookies store the content of ledgers and act as a distributed ensemble.</p> |
| |
| </div> |
| |
| <div id="rereplication-popover-html" class="popover-template"> |
| <p>A subsystem that runs in the background on bookies to ensure that ledgers are fully replicated even if one bookie from the ensemble is down.</p> |
| |
| </div> |
| |
| <div id="striping-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="striped-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="journal-popover-html" class="popover-template"> |
| <p>A journal file stores BookKeeper transaction logs.</p> |
| |
| </div> |
| |
| <div id="fencing-popover-html" class="popover-template"> |
| <p>When a reader forces a ledger to close, preventing any further entries from being written to the ledger.</p> |
| |
| </div> |
| |
| <div id="record-popover-html" class="popover-template"> |
| <p>A record is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Records are also known as entries.</p> |
| |
| </div> |
| |
| |
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| |
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