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| <li class="crumb"><a href="sstablescrub.html">sstablescrub</a></li> |
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| <article class="doc"> |
| <h1 class="page">sstablescrub</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Fix a broken sstable. The scrub process rewrites the sstable, skipping |
| any corrupted rows. Because these rows are lost, follow this process |
| with a repair.</p> |
| </div> |
| <div class="paragraph"> |
| <p>ref: <a href="https://issues.apache.org/jira/browse/CASSANDRA-4321" class="bare">issues.apache.org/jira/browse/CASSANDRA-4321</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Cassandra must be stopped before this tool is executed, or unexpected |
| results will occur. Note: the script does not verify that Cassandra is |
| stopped.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="usage"><a class="anchor" href="#usage"></a>Usage</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>sstablescrub <options> <keyspace> <table></p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">--debug</th> |
| <th class="tableblock halign-left valign-top">display stack traces</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-h,--help</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">display this help message</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-m,--manifest-check</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">only check and repair the leveled manifest, |
| without actually scrubbing the sstables</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-n,--no-validate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">do not validate columns using column validator</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-r,--reinsert-overflowed-ttl</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Rewrites rows with overflowed expiration |
| date affected by CASSANDRA-14092 with the maximum supported expiration |
| date of 2038-01-19T03:14:06+00:00. The rows are rewritten with the |
| original timestamp incremented by one millisecond to override/supersede |
| any potential tombstone that may have been generated during compaction |
| of the affected rows.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-s,--skip-corrupted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">skip corrupt rows in counter tables</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">-v,--verbose</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">verbose output</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="basic-scrub"><a class="anchor" href="#basic-scrub"></a>Basic Scrub</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The scrub without options will do a snapshot first, then write all |
| non-corrupted files to a new sstable.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>sstablescrub keyspace1 standard1 |
| Pre-scrub sstables snapshotted into snapshot pre-scrub-1534424070883 |
| Scrubbing BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-6365332094dd11e88f324f9c503e4753/mc-5-big-Data.db') (17.142MiB) |
| Scrub of BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-6365332094dd11e88f324f9c503e4753/mc-5-big-Data.db') complete: 73367 rows in new sstable and 0 empty (tombstoned) rows dropped |
| Checking leveled manifest</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="scrub-without-validation"><a class="anchor" href="#scrub-without-validation"></a>Scrub without Validation</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>ref: <a href="https://issues.apache.org/jira/browse/CASSANDRA-9406" class="bare">issues.apache.org/jira/browse/CASSANDRA-9406</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Use the --no-validate option to retain data that may be misrepresented |
| (e.g., an integer stored in a long field) but not corrupt. This data |
| usually doesn not present any errors to the client.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>sstablescrub --no-validate keyspace1 standard1 |
| Pre-scrub sstables snapshotted into snapshot pre-scrub-1536243158517 |
| Scrubbing BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-bc9cf530b1da11e886c66d2c86545d91/mc-2-big-Data.db') (4.482MiB) |
| Scrub of BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-bc9cf530b1da11e886c66d2c86545d91/mc-2-big-Data.db') complete; looks like all 0 rows were tombstoned</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="skip-corrupted-counter-tables"><a class="anchor" href="#skip-corrupted-counter-tables"></a>Skip Corrupted Counter Tables</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>ref: <a href="https://issues.apache.org/jira/browse/CASSANDRA-5930" class="bare">issues.apache.org/jira/browse/CASSANDRA-5930</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>If counter tables are corrupted in a way that prevents sstablescrub from |
| completing, you can use the --skip-corrupted option to skip scrubbing |
| those counter tables. This workaround is not necessary in versions 2.0+.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>sstablescrub --skip-corrupted keyspace1 counter1</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="dealing-with-overflow-dates"><a class="anchor" href="#dealing-with-overflow-dates"></a>Dealing with Overflow Dates</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>ref: <a href="https://issues.apache.org/jira/browse/CASSANDRA-14092" class="bare">issues.apache.org/jira/browse/CASSANDRA-14092</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Using the option --reinsert-overflowed-ttl allows a rewriting of rows |
| that had a max TTL going over the maximum (causing an overflow).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Example:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>sstablescrub --reinsert-overflowed-ttl keyspace1 counter1</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="manifest-check"><a class="anchor" href="#manifest-check"></a>Manifest Check</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>As of Cassandra version 2.0, this option is no longer relevant, since |
| level data was moved from a separate manifest into the sstable metadata.</p> |
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| $('.docs-nav').toggleClass('active'); |
| }); |
| var url = window.location.pathname; |
| var isQuickstart = url.includes('quickstart.html'); |
| if(isQuickstart){ |
| var footerCTA = document.getElementById('footer-cta'); |
| footerCTA.innerHTML = 'Get latest updates'; |
| footerCTA.setAttribute('href', '/_/blog.html'); |
| } |
| }); |
| </script> |
| </div> |
| </body> |
| </html> |
