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From git-site-r...@apache.org
Subject [24/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.
Date Wed, 12 Jul 2017 15:02:45 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2777c693/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html
index b32645e..7968115 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html
@@ -30,590 +30,590 @@
 <span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
 <span class="sourceLineNo">023</span>import java.io.InterruptedIOException;<a name="line.23"></a>
 <span class="sourceLineNo">024</span>import java.util.ArrayList;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.util.HashMap;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import java.util.List;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import java.util.Map;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import java.util.NavigableSet;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import java.util.concurrent.CountDownLatch;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.30"></a>
-<span class="sourceLineNo">031</span><a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.commons.logging.Log;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.commons.logging.LogFactory;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.Cell;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.CellComparator;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.HConstants;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.KeyValue;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.KeyValueUtil;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.client.IsolationLevel;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.executor.ExecutorService;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.filter.Filter;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.regionserver.ScannerContext.NextState;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.regionserver.handler.ParallelSeekHandler;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.regionserver.querymatcher.CompactionScanQueryMatcher;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.regionserver.querymatcher.LegacyScanQueryMatcher;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.regionserver.querymatcher.ScanQueryMatcher;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.regionserver.querymatcher.UserScanQueryMatcher;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.util.CollectionUtils;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.54"></a>
+<span class="sourceLineNo">025</span>import java.util.List;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import java.util.NavigableSet;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import java.util.concurrent.CountDownLatch;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.28"></a>
+<span class="sourceLineNo">029</span><a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.commons.logging.Log;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.commons.logging.LogFactory;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.Cell;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.CellComparator;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.HConstants;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.KeyValue;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.KeyValueUtil;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.client.IsolationLevel;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.executor.ExecutorService;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.filter.Filter;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.regionserver.ScannerContext.NextState;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.regionserver.handler.ParallelSeekHandler;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.regionserver.querymatcher.CompactionScanQueryMatcher;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.regionserver.querymatcher.LegacyScanQueryMatcher;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.regionserver.querymatcher.ScanQueryMatcher;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.regionserver.querymatcher.UserScanQueryMatcher;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.CollectionUtils;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.52"></a>
+<span class="sourceLineNo">053</span><a name="line.53"></a>
+<span class="sourceLineNo">054</span>import com.google.common.annotations.VisibleForTesting;<a name="line.54"></a>
 <span class="sourceLineNo">055</span><a name="line.55"></a>
-<span class="sourceLineNo">056</span>import com.google.common.annotations.VisibleForTesting;<a name="line.56"></a>
-<span class="sourceLineNo">057</span><a name="line.57"></a>
-<span class="sourceLineNo">058</span>/**<a name="line.58"></a>
-<span class="sourceLineNo">059</span> * Scanner scans both the memstore and the Store. Coalesce KeyValue stream into List&amp;lt;KeyValue&amp;gt;<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * for a single row.<a name="line.60"></a>
-<span class="sourceLineNo">061</span> * &lt;p&gt;<a name="line.61"></a>
-<span class="sourceLineNo">062</span> * The implementation is not thread safe. So there will be no race between next and close. The only<a name="line.62"></a>
-<span class="sourceLineNo">063</span> * exception is updateReaders, it will be called in the memstore flush thread to indicate that there<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * is a flush.<a name="line.64"></a>
-<span class="sourceLineNo">065</span> */<a name="line.65"></a>
-<span class="sourceLineNo">066</span>@InterfaceAudience.Private<a name="line.66"></a>
-<span class="sourceLineNo">067</span>public class StoreScanner extends NonReversedNonLazyKeyValueScanner<a name="line.67"></a>
-<span class="sourceLineNo">068</span>    implements KeyValueScanner, InternalScanner, ChangedReadersObserver {<a name="line.68"></a>
-<span class="sourceLineNo">069</span>  private static final Log LOG = LogFactory.getLog(StoreScanner.class);<a name="line.69"></a>
-<span class="sourceLineNo">070</span>  // In unit tests, the store could be null<a name="line.70"></a>
-<span class="sourceLineNo">071</span>  protected final Store store;<a name="line.71"></a>
-<span class="sourceLineNo">072</span>  private ScanQueryMatcher matcher;<a name="line.72"></a>
-<span class="sourceLineNo">073</span>  protected KeyValueHeap heap;<a name="line.73"></a>
-<span class="sourceLineNo">074</span>  private boolean cacheBlocks;<a name="line.74"></a>
-<span class="sourceLineNo">075</span><a name="line.75"></a>
-<span class="sourceLineNo">076</span>  private long countPerRow = 0;<a name="line.76"></a>
-<span class="sourceLineNo">077</span>  private int storeLimit = -1;<a name="line.77"></a>
-<span class="sourceLineNo">078</span>  private int storeOffset = 0;<a name="line.78"></a>
-<span class="sourceLineNo">079</span><a name="line.79"></a>
-<span class="sourceLineNo">080</span>  // Used to indicate that the scanner has closed (see HBASE-1107)<a name="line.80"></a>
-<span class="sourceLineNo">081</span>  // Do not need to be volatile because it's always accessed via synchronized methods<a name="line.81"></a>
-<span class="sourceLineNo">082</span>  private boolean closing = false;<a name="line.82"></a>
-<span class="sourceLineNo">083</span>  private final boolean get;<a name="line.83"></a>
-<span class="sourceLineNo">084</span>  private final boolean explicitColumnQuery;<a name="line.84"></a>
-<span class="sourceLineNo">085</span>  private final boolean useRowColBloom;<a name="line.85"></a>
-<span class="sourceLineNo">086</span>  /**<a name="line.86"></a>
-<span class="sourceLineNo">087</span>   * A flag that enables StoreFileScanner parallel-seeking<a name="line.87"></a>
-<span class="sourceLineNo">088</span>   */<a name="line.88"></a>
-<span class="sourceLineNo">089</span>  private boolean parallelSeekEnabled = false;<a name="line.89"></a>
-<span class="sourceLineNo">090</span>  private ExecutorService executor;<a name="line.90"></a>
-<span class="sourceLineNo">091</span>  private final Scan scan;<a name="line.91"></a>
-<span class="sourceLineNo">092</span>  private final long oldestUnexpiredTS;<a name="line.92"></a>
-<span class="sourceLineNo">093</span>  private final long now;<a name="line.93"></a>
-<span class="sourceLineNo">094</span>  private final int minVersions;<a name="line.94"></a>
-<span class="sourceLineNo">095</span>  private final long maxRowSize;<a name="line.95"></a>
-<span class="sourceLineNo">096</span>  private final long cellsPerHeartbeatCheck;<a name="line.96"></a>
-<span class="sourceLineNo">097</span><a name="line.97"></a>
-<span class="sourceLineNo">098</span>  // 1) Collects all the KVHeap that are eagerly getting closed during the<a name="line.98"></a>
-<span class="sourceLineNo">099</span>  //    course of a scan<a name="line.99"></a>
-<span class="sourceLineNo">100</span>  // 2) Collects the unused memstore scanners. If we close the memstore scanners<a name="line.100"></a>
-<span class="sourceLineNo">101</span>  //    before sending data to client, the chunk may be reclaimed by other<a name="line.101"></a>
-<span class="sourceLineNo">102</span>  //    updates and the data will be corrupt.<a name="line.102"></a>
-<span class="sourceLineNo">103</span>  private final List&lt;KeyValueScanner&gt; scannersForDelayedClose = new ArrayList&lt;&gt;();<a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span>  /**<a name="line.105"></a>
-<span class="sourceLineNo">106</span>   * The number of KVs seen by the scanner. Includes explicitly skipped KVs, but not<a name="line.106"></a>
-<span class="sourceLineNo">107</span>   * KVs skipped via seeking to next row/column. TODO: estimate them?<a name="line.107"></a>
-<span class="sourceLineNo">108</span>   */<a name="line.108"></a>
-<span class="sourceLineNo">109</span>  private long kvsScanned = 0;<a name="line.109"></a>
-<span class="sourceLineNo">110</span>  private Cell prevCell = null;<a name="line.110"></a>
-<span class="sourceLineNo">111</span><a name="line.111"></a>
-<span class="sourceLineNo">112</span>  private final long preadMaxBytes;<a name="line.112"></a>
-<span class="sourceLineNo">113</span>  private long bytesRead;<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span>  /** We don't ever expect to change this, the constant is just for clarity. */<a name="line.115"></a>
-<span class="sourceLineNo">116</span>  static final boolean LAZY_SEEK_ENABLED_BY_DEFAULT = true;<a name="line.116"></a>
-<span class="sourceLineNo">117</span>  public static final String STORESCANNER_PARALLEL_SEEK_ENABLE =<a name="line.117"></a>
-<span class="sourceLineNo">118</span>      "hbase.storescanner.parallel.seek.enable";<a name="line.118"></a>
-<span class="sourceLineNo">119</span><a name="line.119"></a>
-<span class="sourceLineNo">120</span>  /** Used during unit testing to ensure that lazy seek does save seek ops */<a name="line.120"></a>
-<span class="sourceLineNo">121</span>  private static boolean lazySeekEnabledGlobally = LAZY_SEEK_ENABLED_BY_DEFAULT;<a name="line.121"></a>
-<span class="sourceLineNo">122</span><a name="line.122"></a>
-<span class="sourceLineNo">123</span>  /**<a name="line.123"></a>
-<span class="sourceLineNo">124</span>   * The number of cells scanned in between timeout checks. Specifying a larger value means that<a name="line.124"></a>
-<span class="sourceLineNo">125</span>   * timeout checks will occur less frequently. Specifying a small value will lead to more frequent<a name="line.125"></a>
-<span class="sourceLineNo">126</span>   * timeout checks.<a name="line.126"></a>
-<span class="sourceLineNo">127</span>   */<a name="line.127"></a>
-<span class="sourceLineNo">128</span>  public static final String HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK =<a name="line.128"></a>
-<span class="sourceLineNo">129</span>      "hbase.cells.scanned.per.heartbeat.check";<a name="line.129"></a>
-<span class="sourceLineNo">130</span><a name="line.130"></a>
-<span class="sourceLineNo">131</span>  /**<a name="line.131"></a>
-<span class="sourceLineNo">132</span>   * Default value of {@link #HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK}.<a name="line.132"></a>
-<span class="sourceLineNo">133</span>   */<a name="line.133"></a>
-<span class="sourceLineNo">134</span>  public static final long DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK = 10000;<a name="line.134"></a>
-<span class="sourceLineNo">135</span><a name="line.135"></a>
-<span class="sourceLineNo">136</span>  /**<a name="line.136"></a>
-<span class="sourceLineNo">137</span>   * If the read type if Scan.ReadType.DEFAULT, we will start with pread, and if the kvs we scanned<a name="line.137"></a>
-<span class="sourceLineNo">138</span>   * reaches this limit, we will reopen the scanner with stream. The default value is 4 times of<a name="line.138"></a>
-<span class="sourceLineNo">139</span>   * block size for this store.<a name="line.139"></a>
-<span class="sourceLineNo">140</span>   */<a name="line.140"></a>
-<span class="sourceLineNo">141</span>  public static final String STORESCANNER_PREAD_MAX_BYTES = "hbase.storescanner.pread.max.bytes";<a name="line.141"></a>
+<span class="sourceLineNo">056</span>/**<a name="line.56"></a>
+<span class="sourceLineNo">057</span> * Scanner scans both the memstore and the Store. Coalesce KeyValue stream into List&amp;lt;KeyValue&amp;gt;<a name="line.57"></a>
+<span class="sourceLineNo">058</span> * for a single row.<a name="line.58"></a>
+<span class="sourceLineNo">059</span> * &lt;p&gt;<a name="line.59"></a>
+<span class="sourceLineNo">060</span> * The implementation is not thread safe. So there will be no race between next and close. The only<a name="line.60"></a>
+<span class="sourceLineNo">061</span> * exception is updateReaders, it will be called in the memstore flush thread to indicate that there<a name="line.61"></a>
+<span class="sourceLineNo">062</span> * is a flush.<a name="line.62"></a>
+<span class="sourceLineNo">063</span> */<a name="line.63"></a>
+<span class="sourceLineNo">064</span>@InterfaceAudience.Private<a name="line.64"></a>
+<span class="sourceLineNo">065</span>public class StoreScanner extends NonReversedNonLazyKeyValueScanner<a name="line.65"></a>
+<span class="sourceLineNo">066</span>    implements KeyValueScanner, InternalScanner, ChangedReadersObserver {<a name="line.66"></a>
+<span class="sourceLineNo">067</span>  private static final Log LOG = LogFactory.getLog(StoreScanner.class);<a name="line.67"></a>
+<span class="sourceLineNo">068</span>  // In unit tests, the store could be null<a name="line.68"></a>
+<span class="sourceLineNo">069</span>  protected final Store store;<a name="line.69"></a>
+<span class="sourceLineNo">070</span>  private ScanQueryMatcher matcher;<a name="line.70"></a>
+<span class="sourceLineNo">071</span>  protected KeyValueHeap heap;<a name="line.71"></a>
+<span class="sourceLineNo">072</span>  private boolean cacheBlocks;<a name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span>  private long countPerRow = 0;<a name="line.74"></a>
+<span class="sourceLineNo">075</span>  private int storeLimit = -1;<a name="line.75"></a>
+<span class="sourceLineNo">076</span>  private int storeOffset = 0;<a name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span>  // Used to indicate that the scanner has closed (see HBASE-1107)<a name="line.78"></a>
+<span class="sourceLineNo">079</span>  // Do not need to be volatile because it's always accessed via synchronized methods<a name="line.79"></a>
+<span class="sourceLineNo">080</span>  private boolean closing = false;<a name="line.80"></a>
+<span class="sourceLineNo">081</span>  private final boolean get;<a name="line.81"></a>
+<span class="sourceLineNo">082</span>  private final boolean explicitColumnQuery;<a name="line.82"></a>
+<span class="sourceLineNo">083</span>  private final boolean useRowColBloom;<a name="line.83"></a>
+<span class="sourceLineNo">084</span>  /**<a name="line.84"></a>
+<span class="sourceLineNo">085</span>   * A flag that enables StoreFileScanner parallel-seeking<a name="line.85"></a>
+<span class="sourceLineNo">086</span>   */<a name="line.86"></a>
+<span class="sourceLineNo">087</span>  private boolean parallelSeekEnabled = false;<a name="line.87"></a>
+<span class="sourceLineNo">088</span>  private ExecutorService executor;<a name="line.88"></a>
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+<span class="sourceLineNo">091</span>  private final long now;<a name="line.91"></a>
+<span class="sourceLineNo">092</span>  private final int minVersions;<a name="line.92"></a>
+<span class="sourceLineNo">093</span>  private final long maxRowSize;<a name="line.93"></a>
+<span class="sourceLineNo">094</span>  private final long cellsPerHeartbeatCheck;<a name="line.94"></a>
+<span class="sourceLineNo">095</span><a name="line.95"></a>
+<span class="sourceLineNo">096</span>  // 1) Collects all the KVHeap that are eagerly getting closed during the<a name="line.96"></a>
+<span class="sourceLineNo">097</span>  //    course of a scan<a name="line.97"></a>
+<span class="sourceLineNo">098</span>  // 2) Collects the unused memstore scanners. If we close the memstore scanners<a name="line.98"></a>
+<span class="sourceLineNo">099</span>  //    before sending data to client, the chunk may be reclaimed by other<a name="line.99"></a>
+<span class="sourceLineNo">100</span>  //    updates and the data will be corrupt.<a name="line.100"></a>
+<span class="sourceLineNo">101</span>  private final List&lt;KeyValueScanner&gt; scannersForDelayedClose = new ArrayList&lt;&gt;();<a name="line.101"></a>
+<span class="sourceLineNo">102</span><a name="line.102"></a>
+<span class="sourceLineNo">103</span>  /**<a name="line.103"></a>
+<span class="sourceLineNo">104</span>   * The number of KVs seen by the scanner. Includes explicitly skipped KVs, but not<a name="line.104"></a>
+<span class="sourceLineNo">105</span>   * KVs skipped via seeking to next row/column. TODO: estimate them?<a name="line.105"></a>
+<span class="sourceLineNo">106</span>   */<a name="line.106"></a>
+<span class="sourceLineNo">107</span>  private long kvsScanned = 0;<a name="line.107"></a>
+<span class="sourceLineNo">108</span>  private Cell prevCell = null;<a name="line.108"></a>
+<span class="sourceLineNo">109</span><a name="line.109"></a>
+<span class="sourceLineNo">110</span>  private final long preadMaxBytes;<a name="line.110"></a>
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+<span class="sourceLineNo">112</span><a name="line.112"></a>
+<span class="sourceLineNo">113</span>  /** We don't ever expect to change this, the constant is just for clarity. */<a name="line.113"></a>
+<span class="sourceLineNo">114</span>  static final boolean LAZY_SEEK_ENABLED_BY_DEFAULT = true;<a name="line.114"></a>
+<span class="sourceLineNo">115</span>  public static final String STORESCANNER_PARALLEL_SEEK_ENABLE =<a name="line.115"></a>
+<span class="sourceLineNo">116</span>      "hbase.storescanner.parallel.seek.enable";<a name="line.116"></a>
+<span class="sourceLineNo">117</span><a name="line.117"></a>
+<span class="sourceLineNo">118</span>  /** Used during unit testing to ensure that lazy seek does save seek ops */<a name="line.118"></a>
+<span class="sourceLineNo">119</span>  private static boolean lazySeekEnabledGlobally = LAZY_SEEK_ENABLED_BY_DEFAULT;<a name="line.119"></a>
+<span class="sourceLineNo">120</span><a name="line.120"></a>
+<span class="sourceLineNo">121</span>  /**<a name="line.121"></a>
+<span class="sourceLineNo">122</span>   * The number of cells scanned in between timeout checks. Specifying a larger value means that<a name="line.122"></a>
+<span class="sourceLineNo">123</span>   * timeout checks will occur less frequently. Specifying a small value will lead to more frequent<a name="line.123"></a>
+<span class="sourceLineNo">124</span>   * timeout checks.<a name="line.124"></a>
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-<span class="sourceLineNo">586</span>    // Only do a sanity-check if store and comparator are available.<a name="line.586"></a>
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-<span class="sourceLineNo">588</span><a name="line.588"></a>
-<span class="sourceLineNo">589</span>    int count = 0;<a name="line.589"></a>
-<span class="sourceLineNo">590</span>    long totalBytesRead = 0;<a name="line.590"></a>
-<span class="sourceLineNo">591</span><a name="line.591"></a>
-<span class="sourceLineNo">592</span>    LOOP: do {<a name="line.592"></a>
-<span class="sourceLineNo">593</span>      // Update and check the time limit based on the configured value of cellsPerTimeoutCheck<a name="line.593"></a>
-<span class="sourceLineNo">594</span>      if ((kvsScanned % cellsPerHeartbeatCheck == 0)) {<a name="line.594"></a>
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-<span class="sourceLineNo">600</span>      }<a name="line.600"></a>
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-<span class="sourceLineNo">607</span>      bytesRead += cellSize;<a name="line.607"></a>
-<span class="sourceLineNo">608</span>      prevCell = cell;<a name="line.608"></a>
+<span class="sourceLineNo">143</span>  // A flag whether use pread for scan<a name="line.143"></a>
+<span class="sourceLineNo">144</span>  // it maybe changed if we use Scan.ReadType.DEFAULT and we have read lots of data.<a name="line.144"></a>
+<span class="sourceLineNo">145</span>  private boolean scanUsePread;<a name="line.145"></a>
+<span class="sourceLineNo">146</span>  // Indicates whether there was flush during the course of the scan<a name="line.146"></a>
+<span class="sourceLineNo">147</span>  private volatile boolean flushed = false;<a name="line.147"></a>
+<span class="sourceLineNo">148</span>  // generally we get one file from a flush<a name="line.148"></a>
+<span class="sourceLineNo">149</span>  private final List&lt;StoreFile&gt; flushedStoreFiles = new ArrayList&lt;&gt;(1);<a name="line.149"></a>
+<span class="sourceLineNo">150</span>  // Since CompactingMemstore is now default, we get three memstore scanners from a flush<a name="line.150"></a>
+<span class="sourceLineNo">151</span>  private final List&lt;KeyValueScanner&gt; memStoreScannersAfterFlush = new ArrayList&lt;&gt;(3);<a name="line.151"></a>
+<span class="sourceLineNo">152</span>  // The current list of scanners<a name="line.152"></a>
+<span class="sourceLineNo">153</span>  @VisibleForTesting<a name="line.153"></a>
+<span class="sourceLineNo">154</span>  final List&lt;KeyValueScanner&gt; currentScanners = new ArrayList&lt;&gt;();<a name="line.154"></a>
+<span class="sourceLineNo">155</span>  // flush update lock<a name="line.155"></a>
+<span class="sourceLineNo">156</span>  private final ReentrantLock flushLock = new ReentrantLock();<a name="line.156"></a>
+<span class="sourceLineNo">157</span><a name="line.157"></a>
+<span class="sourceLineNo">158</span>  protected final long readPt;<a name="line.158"></a>
+<span class="sourceLineNo">159</span>  private boolean topChanged = false;<a name="line.159"></a>
+<span class="sourceLineNo">160</span><a name="line.160"></a>
+<span class="sourceLineNo">161</span>  // used by the injection framework to test race between StoreScanner construction and compaction<a name="line.161"></a>
+<span class="sourceLineNo">162</span>  enum StoreScannerCompactionRace {<a name="line.162"></a>
+<span class="sourceLineNo">163</span>    BEFORE_SEEK,<a name="line.163"></a>
+<span class="sourceLineNo">164</span>    AFTER_SEEK,<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    COMPACT_COMPLETE<a name="line.165"></a>
+<span class="sourceLineNo">166</span>  }<a name="line.166"></a>
+<span class="sourceLineNo">167</span><a name="line.167"></a>
+<span class="sourceLineNo">168</span>  /** An internal constructor. */<a name="line.168"></a>
+<span class="sourceLineNo">169</span>  protected StoreScanner(Store store, Scan scan, final ScanInfo scanInfo,<a name="line.169"></a>
+<span class="sourceLineNo">170</span>      final NavigableSet&lt;byte[]&gt; columns, long readPt, boolean cacheBlocks, ScanType scanType) {<a name="line.170"></a>
+<span class="sourceLineNo">171</span>    this.readPt = readPt;<a name="line.171"></a>
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+<span class="sourceLineNo">173</span>    this.cacheBlocks = cacheBlocks;<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    get = scan.isGetScan();<a name="line.174"></a>
+<span class="sourceLineNo">175</span>    int numCol = columns == null ? 0 : columns.size();<a name="line.175"></a>
+<span class="sourceLineNo">176</span>    explicitColumnQuery = numCol &gt; 0;<a name="line.176"></a>
+<span class="sourceLineNo">177</span>    this.scan = scan;<a name="line.177"></a>
+<span class="sourceLineNo">178</span>    this.now = EnvironmentEdgeManager.currentTime();<a name="line.178"></a>
+<span class="sourceLineNo">179</span>    this.oldestUnexpiredTS = scan.isRaw() ? 0L : now - scanInfo.getTtl();<a name="line.179"></a>
+<span class="sourceLineNo">180</span>    this.minVersions = scanInfo.getMinVersions();<a name="line.180"></a>
+<span class="sourceLineNo">181</span><a name="line.181"></a>
+<span class="sourceLineNo">182</span>     // We look up row-column Bloom filters for multi-column queries as part of<a name="line.182"></a>
+<span class="sourceLineNo">183</span>     // the seek operation. However, we also look the row-column Bloom filter<a name="line.183"></a>
+<span class="sourceLineNo">184</span>     // for multi-row (non-"get") scans because this is not done in<a name="line.184"></a>
+<span class="sourceLineNo">185</span>     // StoreFile.passesBloomFilter(Scan, SortedSet&lt;byte[]&gt;).<a name="line.185"></a>
+<span class="sourceLineNo">186</span>     this.useRowColBloom = numCol &gt; 1 || (!get &amp;&amp; numCol == 1);<a name="line.186"></a>
+<span class="sourceLineNo">187</span><a name="line.187"></a>
+<span class="sourceLineNo">188</span>     this.maxRowSize = scanInfo.getTableMaxRowSize();<a name="line.188"></a>
+<span class="sourceLineNo">189</span>    if (get) {<a name="line.189"></a>
+<span class="sourceLineNo">190</span>      this.readType = Scan.ReadType.PREAD;<a name="line.190"></a>
+<span class="sourceLineNo">191</span>      this.scanUsePread = true;<a name="line.191"></a>
+<span class="sourceLineNo">192</span>    } else if(scanType != scanType.USER_SCAN) {<a name="line.192"></a>
+<span class="sourceLineNo">193</span>      // For compaction scanners never use Pread as already we have stream based scanners on the<a name="line.193"></a>
+<span class="sourceLineNo">194</span>      // store files to be compacted<a name="line.194"></a>
+<span class="sourceLineNo">195</span>      this.readType = Scan.ReadType.STREAM;<a name="line.195"></a>
+<span class="sourceLineNo">196</span>      this.scanUsePread = false;<a name="line.196"></a>
+<span class="sourceLineNo">197</span>    } else {<a name="line.197"></a>
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+<span class="sourceLineNo">199</span>        this.readType = scanInfo.isUsePread() ? Scan.ReadType.PREAD : Scan.ReadType.DEFAULT;<a name="line.199"></a>
+<span class="sourceLineNo">200</span>      } else {<a name="line.200"></a>
+<span class="sourceLineNo">201</span>        this.readType = scan.getReadType();<a name="line.201"></a>
+<span class="sourceLineNo">202</span>      }<a name="line.202"></a>
+<span class="sourceLineNo">203</span>      // Always start with pread unless user specific stream. Will change to stream later if<a name="line.203"></a>
+<span class="sourceLineNo">204</span>      // readType is default if the scan keeps running for a long time.<a name="line.204"></a>
+<span class="sourceLineNo">205</span>      this.scanUsePread = this.readType != Scan.ReadType.STREAM;<a name="line.205"></a>
+<span class="sourceLineNo">206</span>    }<a name="line.206"></a>
+<span class="sourceLineNo">207</span>    this.preadMaxBytes = scanInfo.getPreadMaxBytes();<a name="line.207"></a>
+<span class="sourceLineNo">208</span>    this.cellsPerHeartbeatCheck = scanInfo.getCellsPerTimeoutCheck();<a name="line.208"></a>
+<span class="sourceLineNo">209</span>    // Parallel seeking is on if the config allows and more there is more than one store file.<a name="line.209"></a>
+<span class="sourceLineNo">210</span>    if (this.store != null &amp;&amp; this.store.getStorefilesCount() &gt; 1) {<a name="line.210"></a>
+<span class="sourceLineNo">211</span>      RegionServerServices rsService = ((HStore) store).getHRegion().getRegionServerServices();<a name="line.211"></a>
+<span class="sourceLineNo">212</span>      if (rsService != null &amp;&amp; scanInfo.isParallelSeekEnabled()) {<a name="line.212"></a>
+<span class="sourceLineNo">213</span>        this.parallelSeekEnabled = true;<a name="line.213"></a>
+<span class="sourceLineNo">214</span>        this.executor = rsService.getExecutorService();<a name="line.214"></a>
+<span class="sourceLineNo">215</span>      }<a name="line.215"></a>
+<span class="sourceLineNo">216</span>    }<a name="line.216"></a>
+<span class="sourceLineNo">217</span>  }<a name="line.217"></a>
+<span class="sourceLineNo">218</span><a name="line.218"></a>
+<span class="sourceLineNo">219</span>  private void addCurrentScanners(List&lt;? extends KeyValueScanner&gt; scanners) {<a name="line.219"></a>
+<span class="sourceLineNo">220</span>    this.currentScanners.addAll(scanners);<a name="line.220"></a>
+<span class="sourceLineNo">221</span>  }<a name="line.221"></a>
+<span class="sourceLineNo">222</span><a name="line.222"></a>
+<span class="sourceLineNo">223</span>  /**<a name="line.223"></a>
+<span class="sourceLineNo">224</span>   * Opens a scanner across memstore, snapshot, and all StoreFiles. Assumes we<a name="line.224"></a>
+<span class="sourceLineNo">225</span>   * are not in a compaction.<a name="line.225"></a>
+<span class="sourceLineNo">226</span>   *<a name="line.226"></a>
+<span class="sourceLineNo">227</span>   * @param store who we scan<a name="line.227"></a>
+<span class="sourceLineNo">228</span>   * @param scan the spec<a name="line.228"></a>
+<span class="sourceLineNo">229</span>   * @param columns which columns we are scanning<a name="line.229"></a>
+<span class="sourceLineNo">230</span>   * @throws IOException<a name="line.230"></a>
+<span class="sourceLineNo">231</span>   */<a name="line.231"></a>
+<span class="sourceLineNo">232</span>  public StoreScanner(Store store, ScanInfo scanInfo, Scan scan, final NavigableSet&lt;byte[]&gt; columns,<a name="line.232"></a>
+<span class="sourceLineNo">233</span>      long readPt)<a name="line.233"></a>
+<span class="sourceLineNo">234</span>  throws IOException {<a name="line.234"></a>
+<span class="sourceLineNo">235</span>    this(store, scan, scanInfo, columns, readPt, scan.getCacheBlocks(), ScanType.USER_SCAN);<a name="line.235"></a>
+<span class="sourceLineNo">236</span>    if (columns != null &amp;&amp; scan.isRaw()) {<a name="line.236"></a>
+<span class="sourceLineNo">237</span>      throw new DoNotRetryIOException("Cannot specify any column for a raw scan");<a name="line.237"></a>
+<span class="sourceLineNo">238</span>    }<a name="line.238"></a>
+<span class="sourceLineNo">239</span>    matcher = UserScanQueryMatcher.create(scan, scanInfo, columns, oldestUnexpiredTS, now,<a name="line.239"></a>
+<span class="sourceLineNo">240</span>      store.getCoprocessorHost());<a name="line.240"></a>
+<span class="sourceLineNo">241</span><a name="line.241"></a>
+<span class="sourceLineNo">242</span>    this.store.addChangedReaderObserver(this);<a name="line.242"></a>
+<span class="sourceLineNo">243</span><a name="line.243"></a>
+<span class="sourceLineNo">244</span>    try {<a name="line.244"></a>
+<span class="sourceLineNo">245</span>      // Pass columns to try to filter out unnecessary StoreFiles.<a name="line.245"></a>
+<span class="sourceLineNo">246</span>      List&lt;KeyValueScanner&gt; scanners = getScannersNoCompaction();<a name="line.246"></a>
+<span class="sourceLineNo">247</span><a name="line.247"></a>
+<span class="sourceLineNo">248</span>      // Seek all scanners to the start of the Row (or if the exact matching row<a name="line.248"></a>
+<span class="sourceLineNo">249</span>      // key does not exist, then to the start of the next matching Row).<a name="line.249"></a>
+<span class="sourceLineNo">250</span>      // Always check bloom filter to optimize the top row seek for delete<a name="line.250"></a>
+<span class="sourceLineNo">251</span>      // family marker.<a name="line.251"></a>
+<span class="sourceLineNo">252</span>      seekScanners(scanners, matcher.getStartKey(), explicitColumnQuery &amp;&amp; lazySeekEnabledGlobally,<a name="line.252"></a>
+<span class="sourceLineNo">253</span>        parallelSeekEnabled);<a name="line.253"></a>
+<span class="sourceLineNo">254</span><a name="line.254"></a>
+<span class="sourceLineNo">255</span>      // set storeLimit<a name="line.255"></a>
+<span class="sourceLineNo">256</span>      this.storeLimit = scan.getMaxResultsPerColumnFamily();<a name="line.256"></a>
+<span class="sourceLineNo">257</span><a name="line.257"></a>
+<span class="sourceLineNo">258</span>      // set rowOffset<a name="line.258"></a>
+<span class="sourceLineNo">259</span>      this.storeOffset = scan.getRowOffsetPerColumnFamily();<a name="line.259"></a>
+<span class="sourceLineNo">260</span>      addCurrentScanners(scanners);<a name="line.260"></a>
+<span class="sourceLineNo">261</span>      // Combine all seeked scanners with a heap<a name="line.261"></a>
+<span class="sourceLineNo">262</span>      resetKVHeap(scanners, store.getComparator());<a name="line.262"></a>
+<span class="sourceLineNo">263</span>    } catch (IOException e) {<a name="line.263"></a>
+<span class="sourceLineNo">264</span>      // remove us from the HStore#changedReaderObservers here or we'll have no chance to<a name="line.264"></a>
+<span class="sourceLineNo">265</span>      // and might cause memory leak<a name="line.265"></a>
+<span class="sourceLineNo">266</span>      this.store.deleteChangedReaderObserver(this);<a name="line.266"></a>
+<span class="sourceLineNo">267</span>      throw e;<a name="line.267"></a>
+<span class="sourceLineNo">268</span>    }<a name="line.268"></a>
+<span class="sourceLineNo">269</span>  }<a name="line.269"></a>
+<span class="sourceLineNo">270</span><a name="line.270"></a>
+<span class="sourceLineNo">271</span>  /**<a name="line.271"></a>
+<span class="sourceLineNo">272</span>   * Used for compactions.&lt;p&gt;<a name="line.272"></a>
+<span class="sourceLineNo">273</span>   *<a name="line.273"></a>
+<span class="sourceLineNo">274</span>   * Opens a scanner across specified StoreFiles.<a name="line.274"></a>
+<span class="sourceLineNo">275</span>   * @param store who we scan<a name="line.275"></a>
+<span class="sourceLineNo">276</span>   * @param scan the spec<a name="line.276"></a>
+<span class="sourceLineNo">277</span>   * @param scanners ancillary scanners<a name="line.277"></a>
+<span class="sourceLineNo">278</span>   * @param smallestReadPoint the readPoint that we should use for tracking<a name="line.278"></a>
+<span class="sourceLineNo">279</span>   *          versions<a name="line.279"></a>
+<span class="sourceLineNo">280</span>   */<a name="line.280"></a>
+<span class="sourceLineNo">281</span>  public StoreScanner(Store store, ScanInfo scanInfo, Scan scan,<a name="line.281"></a>
+<span class="sourceLineNo">282</span>      List&lt;? extends KeyValueScanner&gt; scanners, ScanType scanType,<a name="line.282"></a>
+<span class="sourceLineNo">283</span>      long smallestReadPoint, long earliestPutTs) throws IOException {<a name="line.283"></a>
+<span class="sourceLineNo">284</span>    this(store, scanInfo, scan, scanners, scanType, smallestReadPoint, earliestPutTs, null, null);<a name="line.284"></a>
+<span class="sourceLineNo">285</span>  }<a name="line.285"></a>
+<span class="sourceLineNo">286</span><a name="line.286"></a>
+<span class="sourceLineNo">287</span>  /**<a name="line.287"></a>
+<span class="sourceLineNo">288</span>   * Used for compactions that drop deletes from a limited range of rows.&lt;p&gt;<a name="line.288"></a>
+<span class="sourceLineNo">289</span>   *<a name="line.289"></a>
+<span class="sourceLineNo">290</span>   * Opens a scanner across specified StoreFiles.<a name="line.290"></a>
+<span class="sourceLineNo">291</span>   * @param store who we scan<a name="line.291"></a>
+<span class="sourceLineNo">292</span>   * @param scan the spec<a name="line.292"></a>
+<span class="sourceLineNo">293</span>   * @param scanners ancillary scanners<a name="line.293"></a>
+<span class="sourceLineNo">294</span>   * @param smallestReadPoint the readPoint that we should use for tracking versions<a name="line.294"></a>
+<span class="sourceLineNo">295</span>   * @param dropDeletesFromRow The inclusive left bound of the range; can be EMPTY_START_ROW.<a name="line.295"></a>
+<span class="sourceLineNo">296</span>   * @param dropDeletesToRow The exclusive right bound of the range; can be EMPTY_END_ROW.<a name="line.296"></a>
+<span class="sourceLineNo">297</span>   */<a name="line.297"></a>
+<span class="sourceLineNo">298</span>  public StoreScanner(Store store, ScanInfo scanInfo, Scan scan,<a name="line.298"></a>
+<span class="sourceLineNo">299</span>      List&lt;? extends KeyValueScanner&gt; scanners, long smallestReadPoint, long earliestPutTs,<a name="line.299"></a>
+<span class="sourceLineNo">300</span>      byte[] dropDeletesFromRow, byte[] dropDeletesToRow) throws IOException {<a name="line.300"></a>
+<span class="sourceLineNo">301</span>    this(store, scanInfo, scan, scanners, ScanType.COMPACT_RETAIN_DELETES, smallestReadPoint,<a name="line.301"></a>
+<span class="sourceLineNo">302</span>        earliestPutTs, dropDeletesFromRow, dropDeletesToRow);<a name="line.302"></a>
+<span class="sourceLineNo">303</span>  }<a name="line.303"></a>
+<span class="sourceLineNo">304</span><a name="line.304"></a>
+<span class="sourceLineNo">305</span>  private StoreScanner(Store store, ScanInfo scanInfo, Scan scan,<a name="line.305"></a>
+<span class="sourceLineNo">306</span>      List&lt;? extends KeyValueScanner&gt; scanners, ScanType scanType, long smallestReadPoint,<a name="line.306"></a>
+<span class="sourceLineNo">307</span>      long earliestPutTs, byte[] dropDeletesF

<TRUNCATED>

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