*/
class HTMLCacheUpdate
{
- public $mTitle, $mTable, $mPrefix;
+ public $mTitle, $mTable, $mPrefix, $mStart, $mEnd;
public $mRowsPerJob, $mRowsPerQuery;
- function __construct( $titleTo, $table ) {
+ function __construct( $titleTo, $table, $start = false, $end = false ) {
global $wgUpdateRowsPerJob, $wgUpdateRowsPerQuery;
$this->mTitle = $titleTo;
$this->mTable = $table;
+ $this->mStart = $start;
+ $this->mEnd = $end;
$this->mRowsPerJob = $wgUpdateRowsPerJob;
$this->mRowsPerQuery = $wgUpdateRowsPerQuery;
$this->mCache = $this->mTitle->getBacklinkCache();
}
public function doUpdate() {
- # Fetch the IDs
- $numRows = $this->mCache->getNumLinks( $this->mTable );
+ if ( $this->mStart || $this->mEnd ) {
+ $this->doPartialUpdate();
+ return;
+ }
- if ( $numRows != 0 ) {
- if ( $numRows > $this->mRowsPerJob ) {
- $this->insertJobs();
+ # Get an estimate of the number of rows from the BacklinkCache
+ $numRows = $this->mCache->getNumLinks( $this->mTable );
+ if ( $numRows > $this->mRowsPerJob * 2 ) {
+ # Do fast cached partition
+ $this->insertJobs();
+ } else {
+ # Get the links from the DB
+ $titleArray = $this->mCache->getLinks( $this->mTable );
+ # Check if the row count estimate was correct
+ if ( $titleArray->count() > $this->mRowsPerJob * 2 ) {
+ # Not correct, do accurate partition
+ wfDebug( __METHOD__.": row count estimate was incorrect, repartitioning\n" );
+ $this->insertJobsFromTitles( $titleArray );
} else {
- $this->invalidate();
+ $this->invalidateTitles( $titleArray );
+ }
+ }
+ }
+
+ /**
+ * Update some of the backlinks, defined by a page ID range
+ */
+ protected function doPartialUpdate() {
+ $titleArray = $this->mCache->getLinks( $this->mTable, $this->mStart, $this->mEnd );
+ if ( $titleArray->count() <= $this->mRowsPerJob * 2 ) {
+ # This partition is small enough, do the update
+ $this->invalidateTitles( $titleArray );
+ } else {
+ # Partitioning was excessively inaccurate. Divide the job further.
+ # This can occur when a large number of links are added in a short
+ # period of time, say by updating a heavily-used template.
+ $this->insertJobsFromTitles( $titleArray );
+ }
+ }
+
+ /**
+ * Partition the current range given by $this->mStart and $this->mEnd,
+ * using a pre-calculated title array which gives the links in that range.
+ * Queue the resulting jobs.
+ */
+ protected function insertJobsFromTitles( $titleArray ) {
+ # We make subpartitions in the sense that the start of the first job
+ # will be the start of the parent partition, and the end of the last
+ # job will be the end of the parent partition.
+ $jobs = array();
+ $start = $this->mStart; # start of the current job
+ $numTitles = 0;
+ foreach ( $titleArray as $title ) {
+ $id = $title->getArticleID();
+ # $numTitles is now the number of titles in the current job not
+ # including the current ID
+ if ( $numTitles >= $this->mRowsPerJob ) {
+ # Add a job up to but not including the current ID
+ $params = array(
+ 'table' => $this->mTable,
+ 'start' => $start,
+ 'end' => $id - 1
+ );
+ $jobs[] = new HTMLCacheUpdateJob( $this->mTitle, $params );
+ $start = $id;
+ $numTitles = 0;
}
+ $numTitles++;
}
- wfRunHooks( 'HTMLCacheUpdate::doUpdate', array($this->mTitle) );
+ # Last job
+ $params = array(
+ 'table' => $this->mTable,
+ 'start' => $start,
+ 'end' => $this->mEnd
+ );
+ $jobs[] = new HTMLCacheUpdateJob( $this->mTitle, $params );
+ wfDebug( __METHOD__.": repartitioning into " . count( $jobs ) . " jobs\n" );
+
+ if ( count( $jobs ) < 2 ) {
+ # I don't think this is possible at present, but handling this case
+ # makes the code a bit more robust against future code updates and
+ # avoids a potential infinite loop of repartitioning
+ wfDebug( __METHOD__.": repartitioning failed!\n" );
+ $this->invalidateTitles( $titleArray );
+ return;
+ }
+
+ Job::batchInsert( $jobs );
}
protected function insertJobs() {
if ( !$batches ) {
return;
}
+ $jobs = array();
foreach ( $batches as $batch ) {
$params = array(
'table' => $this->mTable,
Job::batchInsert( $jobs );
}
-
/**
- * Invalidate a set of pages, right now
+ * Invalidate a range of pages, right now
+ * @deprecated
*/
public function invalidate( $startId = false, $endId = false ) {
- global $wgUseFileCache, $wgUseSquid;
-
$titleArray = $this->mCache->getLinks( $this->mTable, $startId, $endId );
- if ( $titleArray->count() == 0 ) {
- return;
- }
+ $this->invalidateTitles( $titleArray );
+ }
+
+ /**
+ * Invalidate an array (or iterator) of Title objects, right now
+ */
+ protected function invalidateTitles( $titleArray ) {
+ global $wgUseFileCache, $wgUseSquid;
$dbw = wfGetDB( DB_MASTER );
$timestamp = $dbw->timestamp();
foreach ( $titleArray as $title ) {
$ids[] = $title->getArticleID();
}
+
+ if ( !$ids ) {
+ return;
+ }
+
# Update page_touched
- $dbw->update( 'page',
- array( 'page_touched' => $timestamp ),
- array( 'page_id IN (' . $dbw->makeList( $ids ) . ')' ),
- __METHOD__
- );
+ $batches = array_chunk( $ids, $this->mRowsPerQuery );
+ foreach ( $batches as $batch ) {
+ $dbw->update( 'page',
+ array( 'page_touched' => $timestamp ),
+ array( 'page_id IN (' . $dbw->makeList( $batch ) . ')' ),
+ __METHOD__
+ );
+ }
# Update squid
if ( $wgUseSquid ) {
}
}
}
+
}
/**
/**
* Construct a job
- * @param Title $title The title linked to
- * @param array $params Job parameters (table, start and end page_ids)
- * @param integer $id job_id
+ * @param $title Title: the title linked to
+ * @param $params Array: job parameters (table, start and end page_ids)
+ * @param $id Integer: job id
*/
function __construct( $title, $params, $id = 0 ) {
parent::__construct( 'htmlCacheUpdate', $title, $params, $id );
}
public function run() {
- $update = new HTMLCacheUpdate( $this->title, $this->table );
- $update->invalidate( $this->start, $this->end );
+ $update = new HTMLCacheUpdate( $this->title, $this->table, $this->start, $this->end );
+ $update->doUpdate();
return true;
}
}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff