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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/03/03 18:16:50 UTC
[04/49] hbase-site git commit: Published site at
4b3e38705cb24aee82615b1b9af47ed549ea1358.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/4ce8323f/xref/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
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diff --git a/xref/org/apache/hadoop/hbase/regionserver/SegmentScanner.html b/xref/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
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+++ b/xref/org/apache/hadoop/hbase/regionserver/SegmentScanner.html
@@ -29,137 +29,361 @@
<a class="jxr_linenumber" name="19" href="#19">19</a> <strong class="jxr_keyword">package</strong> org.apache.hadoop.hbase.regionserver;
<a class="jxr_linenumber" name="20" href="#20">20</a>
<a class="jxr_linenumber" name="21" href="#21">21</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
-<a class="jxr_linenumber" name="22" href="#22">22</a>
-<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.Cell;
-<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.classification.InterfaceAudience;
-<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.Scan;
-<a class="jxr_linenumber" name="26" href="#26">26</a>
-<a class="jxr_linenumber" name="27" href="#27">27</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="28" href="#28">28</a> <em class="jxr_javadoccomment"> * An abstraction for store segment scanner.</em>
-<a class="jxr_linenumber" name="29" href="#29">29</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="30" href="#30">30</a> @InterfaceAudience.Private
-<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/SegmentScanner.html">SegmentScanner</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html">KeyValueScanner</a> {
-<a class="jxr_linenumber" name="32" href="#32">32</a>
-<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> sequenceID = Long.MAX_VALUE;
-<a class="jxr_linenumber" name="34" href="#34">34</a>
-<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">abstract</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html">Segment</a> getSegment();
-<a class="jxr_linenumber" name="36" href="#36">36</a>
-<a class="jxr_linenumber" name="37" href="#37">37</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * Get the sequence id associated with this KeyValueScanner. This is required</em>
-<a class="jxr_linenumber" name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * for comparing multiple files (or memstore segments) scanners to find out</em>
-<a class="jxr_linenumber" name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * which one has the latest data.</em>
-<a class="jxr_linenumber" name="41" href="#41">41</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="42" href="#42">42</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="43" href="#43">43</a> @Override
-<a class="jxr_linenumber" name="44" href="#44">44</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> getSequenceID() {
-<a class="jxr_linenumber" name="45" href="#45">45</a> <strong class="jxr_keyword">return</strong> sequenceID;
-<a class="jxr_linenumber" name="46" href="#46">46</a> }
-<a class="jxr_linenumber" name="47" href="#47">47</a>
-<a class="jxr_linenumber" name="48" href="#48">48</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="49" href="#49">49</a> <em class="jxr_javadoccomment"> * Close the KeyValue scanner.</em>
-<a class="jxr_linenumber" name="50" href="#50">50</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="51" href="#51">51</a> @Override
-<a class="jxr_linenumber" name="52" href="#52">52</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close() {
-<a class="jxr_linenumber" name="53" href="#53">53</a> getSegment().decScannerCount();
-<a class="jxr_linenumber" name="54" href="#54">54</a> }
-<a class="jxr_linenumber" name="55" href="#55">55</a>
-<a class="jxr_linenumber" name="56" href="#56">56</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="57" href="#57">57</a> <em class="jxr_javadoccomment"> * This functionality should be resolved in the higher level which is</em>
-<a class="jxr_linenumber" name="58" href="#58">58</a> <em class="jxr_javadoccomment"> * MemStoreScanner, currently returns true as default. Doesn't throw</em>
-<a class="jxr_linenumber" name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * IllegalStateException in order not to change the signature of the</em>
-<a class="jxr_linenumber" name="60" href="#60">60</a> <em class="jxr_javadoccomment"> * overridden method</em>
-<a class="jxr_linenumber" name="61" href="#61">61</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="62" href="#62">62</a> @Override
-<a class="jxr_linenumber" name="63" href="#63">63</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> shouldUseScanner(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html">Scan</a> scan, <a href="../../../../../org/apache/hadoop/hbase/regionserver/Store.html">Store</a> store, <strong class="jxr_keyword">long</strong> oldestUnexpiredTS) {
-<a class="jxr_linenumber" name="64" href="#64">64</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="65" href="#65">65</a> }
-<a class="jxr_linenumber" name="66" href="#66">66</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="67" href="#67">67</a> <em class="jxr_javadoccomment"> * This scanner is working solely on the in-memory MemStore therefore this</em>
-<a class="jxr_linenumber" name="68" href="#68">68</a> <em class="jxr_javadoccomment"> * interface is not relevant.</em>
-<a class="jxr_linenumber" name="69" href="#69">69</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="70" href="#70">70</a> @Override
-<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> requestSeek(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> c, <strong class="jxr_keyword">boolean</strong> forward, <strong class="jxr_keyword">boolean</strong> useBloom)
-<a class="jxr_linenumber" name="72" href="#72">72</a> <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="73" href="#73">73</a>
-<a class="jxr_linenumber" name="74" href="#74">74</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
-<a class="jxr_linenumber" name="75" href="#75">75</a> <span class="jxr_string">"requestSeek cannot be called on MutableCellSetSegmentScanner"</span>);
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.Iterator;
+<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.util.SortedSet;
+<a class="jxr_linenumber" name="24" href="#24">24</a>
+<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.Cell;
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.CellUtil;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.classification.InterfaceAudience;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.hbase.client.Scan;
+<a class="jxr_linenumber" name="29" href="#29">29</a>
+<a class="jxr_linenumber" name="30" href="#30">30</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * A scanner of a single memstore segment.</em>
+<a class="jxr_linenumber" name="32" href="#32">32</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="33" href="#33">33</a> @InterfaceAudience.Private
+<a class="jxr_linenumber" name="34" href="#34">34</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/SegmentScanner.html">SegmentScanner</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html">KeyValueScanner</a> {
+<a class="jxr_linenumber" name="35" href="#35">35</a>
+<a class="jxr_linenumber" name="36" href="#36">36</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> sequenceID = Long.MAX_VALUE;
+<a class="jxr_linenumber" name="37" href="#37">37</a>
+<a class="jxr_linenumber" name="38" href="#38">38</a> <em class="jxr_comment">// the observed structure</em>
+<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html">Segment</a> segment;
+<a class="jxr_linenumber" name="40" href="#40">40</a> <em class="jxr_comment">// the highest relevant MVCC</em>
+<a class="jxr_linenumber" name="41" href="#41">41</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> readPoint;
+<a class="jxr_linenumber" name="42" href="#42">42</a> <em class="jxr_comment">// the current iterator that can be reinitialized by</em>
+<a class="jxr_linenumber" name="43" href="#43">43</a> <em class="jxr_comment">// seek(), backwardSeek(), or reseek()</em>
+<a class="jxr_linenumber" name="44" href="#44">44</a> <strong class="jxr_keyword">private</strong> Iterator<Cell> iter;
+<a class="jxr_linenumber" name="45" href="#45">45</a> <em class="jxr_comment">// the pre-calculated cell to be returned by peek()</em>
+<a class="jxr_linenumber" name="46" href="#46">46</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> current = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="47" href="#47">47</a> <em class="jxr_comment">// or next()</em>
+<a class="jxr_linenumber" name="48" href="#48">48</a> <em class="jxr_comment">// A flag represents whether could stop skipping KeyValues for MVCC</em>
+<a class="jxr_linenumber" name="49" href="#49">49</a> <em class="jxr_comment">// if have encountered the next row. Only used for reversed scan</em>
+<a class="jxr_linenumber" name="50" href="#50">50</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> stopSkippingKVsIfNextRow = false;
+<a class="jxr_linenumber" name="51" href="#51">51</a> <em class="jxr_comment">// last iterated KVs by seek (to restore the iterator state after reseek)</em>
+<a class="jxr_linenumber" name="52" href="#52">52</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> last = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="53" href="#53">53</a>
+<a class="jxr_linenumber" name="54" href="#54">54</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/SegmentScanner.html">SegmentScanner</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html">Segment</a> segment, <strong class="jxr_keyword">long</strong> readPoint) {
+<a class="jxr_linenumber" name="55" href="#55">55</a> <strong class="jxr_keyword">this</strong>.segment = segment;
+<a class="jxr_linenumber" name="56" href="#56">56</a> <strong class="jxr_keyword">this</strong>.readPoint = readPoint;
+<a class="jxr_linenumber" name="57" href="#57">57</a> iter = segment.iterator();
+<a class="jxr_linenumber" name="58" href="#58">58</a> <em class="jxr_comment">// the initialization of the current is required for working with heap of SegmentScanners</em>
+<a class="jxr_linenumber" name="59" href="#59">59</a> current = getNext();
+<a class="jxr_linenumber" name="60" href="#60">60</a> <em class="jxr_comment">//increase the reference count so the underlying structure will not be de-allocated</em>
+<a class="jxr_linenumber" name="61" href="#61">61</a> <strong class="jxr_keyword">this</strong>.segment.incScannerCount();
+<a class="jxr_linenumber" name="62" href="#62">62</a> }
+<a class="jxr_linenumber" name="63" href="#63">63</a>
+<a class="jxr_linenumber" name="64" href="#64">64</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="65" href="#65">65</a> <em class="jxr_javadoccomment"> * Look at the next Cell in this scanner, but do not iterate the scanner</em>
+<a class="jxr_linenumber" name="66" href="#66">66</a> <em class="jxr_javadoccomment"> * @return the currently observed Cell</em>
+<a class="jxr_linenumber" name="67" href="#67">67</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="68" href="#68">68</a> @Override
+<a class="jxr_linenumber" name="69" href="#69">69</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> peek() { <em class="jxr_comment">// sanity check, the current should be always valid</em>
+<a class="jxr_linenumber" name="70" href="#70">70</a> <strong class="jxr_keyword">if</strong> (current!=<strong class="jxr_keyword">null</strong> && current.getSequenceId() > readPoint) {
+<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> RuntimeException(<span class="jxr_string">"current is invalid: read point is "</span>+readPoint+<span class="jxr_string">", "</span> +
+<a class="jxr_linenumber" name="72" href="#72">72</a> <span class="jxr_string">"while current sequence id is "</span> +current.getSequenceId());
+<a class="jxr_linenumber" name="73" href="#73">73</a> }
+<a class="jxr_linenumber" name="74" href="#74">74</a>
+<a class="jxr_linenumber" name="75" href="#75">75</a> <strong class="jxr_keyword">return</strong> current;
<a class="jxr_linenumber" name="76" href="#76">76</a> }
<a class="jxr_linenumber" name="77" href="#77">77</a>
<a class="jxr_linenumber" name="78" href="#78">78</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="79" href="#79">79</a> <em class="jxr_javadoccomment"> * This scanner is working solely on the in-memory MemStore and doesn't work on</em>
-<a class="jxr_linenumber" name="80" href="#80">80</a> <em class="jxr_javadoccomment"> * store files, MutableCellSetSegmentScanner always does the seek,</em>
-<a class="jxr_linenumber" name="81" href="#81">81</a> <em class="jxr_javadoccomment"> * therefore always returning true.</em>
-<a class="jxr_linenumber" name="82" href="#82">82</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="83" href="#83">83</a> @Override
-<a class="jxr_linenumber" name="84" href="#84">84</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> realSeekDone() {
-<a class="jxr_linenumber" name="85" href="#85">85</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="86" href="#86">86</a> }
-<a class="jxr_linenumber" name="87" href="#87">87</a>
-<a class="jxr_linenumber" name="88" href="#88">88</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="89" href="#89">89</a> <em class="jxr_javadoccomment"> * This function should be never called on scanners that always do real seek operations (i.e. most</em>
-<a class="jxr_linenumber" name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * of the scanners and also this one). The easiest way to achieve this is to call</em>
-<a class="jxr_linenumber" name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * {@link #realSeekDone()} first.</em>
-<a class="jxr_linenumber" name="92" href="#92">92</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="93" href="#93">93</a> @Override
-<a class="jxr_linenumber" name="94" href="#94">94</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> enforceSeek() <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="95" href="#95">95</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
-<a class="jxr_linenumber" name="96" href="#96">96</a> <span class="jxr_string">"enforceSeek cannot be called on MutableCellSetSegmentScanner"</span>);
-<a class="jxr_linenumber" name="97" href="#97">97</a> }
-<a class="jxr_linenumber" name="98" href="#98">98</a>
-<a class="jxr_linenumber" name="99" href="#99">99</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * @return true if this is a file scanner. Otherwise a memory scanner is assumed.</em>
-<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="102" href="#102">102</a> @Override
-<a class="jxr_linenumber" name="103" href="#103">103</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isFileScanner() {
-<a class="jxr_linenumber" name="104" href="#104">104</a> <strong class="jxr_keyword">return</strong> false;
-<a class="jxr_linenumber" name="105" href="#105">105</a> }
-<a class="jxr_linenumber" name="106" href="#106">106</a>
-<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * @return the next key in the index (the key to seek to the next block)</em>
-<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * if known, or null otherwise</em>
-<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * Not relevant for in-memory scanner</em>
-<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="112" href="#112">112</a> @Override
-<a class="jxr_linenumber" name="113" href="#113">113</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> getNextIndexedKey() {
-<a class="jxr_linenumber" name="114" href="#114">114</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="115" href="#115">115</a> }
-<a class="jxr_linenumber" name="116" href="#116">116</a>
-<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * Called after a batch of rows scanned (RPC) and set to be returned to client. Any in between</em>
-<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * cleanup can be done here. Nothing to be done for MutableCellSetSegmentScanner.</em>
-<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="121" href="#121">121</a> @Override
-<a class="jxr_linenumber" name="122" href="#122">122</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> shipped() <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_comment">// do nothing</em>
-<a class="jxr_linenumber" name="124" href="#124">124</a> }
-<a class="jxr_linenumber" name="125" href="#125">125</a>
-<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * Set the sequence id of the scanner.</em>
-<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * This is used to determine an order between memory segment scanners.</em>
-<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * @param x a unique sequence id</em>
-<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="131" href="#131">131</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setSequenceID(<strong class="jxr_keyword">long</strong> x) {
-<a class="jxr_linenumber" name="132" href="#132">132</a> sequenceID = x;
-<a class="jxr_linenumber" name="133" href="#133">133</a> }
-<a class="jxr_linenumber" name="134" href="#134">134</a>
-<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * Returns whether the given scan should seek in this segment</em>
-<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * @return whether the given scan should seek in this segment</em>
-<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="139" href="#139">139</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> shouldSeek(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html">Scan</a> scan, <strong class="jxr_keyword">long</strong> oldestUnexpiredTS) {
-<a class="jxr_linenumber" name="140" href="#140">140</a> <strong class="jxr_keyword">return</strong> getSegment().shouldSeek(scan,oldestUnexpiredTS);
-<a class="jxr_linenumber" name="141" href="#141">141</a> }
-<a class="jxr_linenumber" name="142" href="#142">142</a>
-<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_comment">//debug method</em>
-<a class="jxr_linenumber" name="144" href="#144">144</a> @Override
-<a class="jxr_linenumber" name="145" href="#145">145</a> <strong class="jxr_keyword">public</strong> String toString() {
-<a class="jxr_linenumber" name="146" href="#146">146</a> String res = <span class="jxr_string">"Store segment scanner of type "</span>+<strong class="jxr_keyword">this</strong>.getClass().getName()+<span class="jxr_string">"; "</span>;
-<a class="jxr_linenumber" name="147" href="#147">147</a> res += <span class="jxr_string">"sequence id "</span>+getSequenceID()+<span class="jxr_string">"; "</span>;
-<a class="jxr_linenumber" name="148" href="#148">148</a> res += getSegment().toString();
-<a class="jxr_linenumber" name="149" href="#149">149</a> <strong class="jxr_keyword">return</strong> res;
+<a class="jxr_linenumber" name="79" href="#79">79</a> <em class="jxr_javadoccomment"> * Return the next Cell in this scanner, iterating the scanner</em>
+<a class="jxr_linenumber" name="80" href="#80">80</a> <em class="jxr_javadoccomment"> * @return the next Cell or null if end of scanner</em>
+<a class="jxr_linenumber" name="81" href="#81">81</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="82" href="#82">82</a> @Override
+<a class="jxr_linenumber" name="83" href="#83">83</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> next() <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="84" href="#84">84</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> oldCurrent = current;
+<a class="jxr_linenumber" name="85" href="#85">85</a> current = getNext(); <em class="jxr_comment">// update the currently observed Cell</em>
+<a class="jxr_linenumber" name="86" href="#86">86</a> <strong class="jxr_keyword">return</strong> oldCurrent;
+<a class="jxr_linenumber" name="87" href="#87">87</a> }
+<a class="jxr_linenumber" name="88" href="#88">88</a>
+<a class="jxr_linenumber" name="89" href="#89">89</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * Seek the scanner at or after the specified Cell.</em>
+<a class="jxr_linenumber" name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * @param cell seek value</em>
+<a class="jxr_linenumber" name="92" href="#92">92</a> <em class="jxr_javadoccomment"> * @return true if scanner has values left, false if end of scanner</em>
+<a class="jxr_linenumber" name="93" href="#93">93</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="94" href="#94">94</a> @Override
+<a class="jxr_linenumber" name="95" href="#95">95</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> seek(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> cell) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="96" href="#96">96</a> <strong class="jxr_keyword">if</strong>(cell == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="97" href="#97">97</a> close();
+<a class="jxr_linenumber" name="98" href="#98">98</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="99" href="#99">99</a> }
+<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_comment">// restart the iterator from new key</em>
+<a class="jxr_linenumber" name="101" href="#101">101</a> iter = segment.tailSet(cell).iterator();
+<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_comment">// last is going to be reinitialized in the next getNext() call</em>
+<a class="jxr_linenumber" name="103" href="#103">103</a> last = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="104" href="#104">104</a> current = getNext();
+<a class="jxr_linenumber" name="105" href="#105">105</a> <strong class="jxr_keyword">return</strong> (current != <strong class="jxr_keyword">null</strong>);
+<a class="jxr_linenumber" name="106" href="#106">106</a> }
+<a class="jxr_linenumber" name="107" href="#107">107</a>
+<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * Reseek the scanner at or after the specified KeyValue.</em>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * This method is guaranteed to seek at or after the required key only if the</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * key comes after the current position of the scanner. Should not be used</em>
+<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * to seek to a key which may come before the current position.</em>
+<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * @param cell seek value (should be non-null)</em>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * @return true if scanner has values left, false if end of scanner</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> @Override
+<a class="jxr_linenumber" name="118" href="#118">118</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> reseek(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> cell) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="119" href="#119">119</a>
+<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_comment"> See HBASE-4195 & HBASE-3855 & HBASE-6591 for the background on this implementation.</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_comment"> This code is executed concurrently with flush and puts, without locks.</em>
+<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_comment"> The ideal implementation for performance would use the sub skip list implicitly</em>
+<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_comment"> pointed by the iterator. Unfortunately the Java API does not offer a method to</em>
+<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_comment"> get it. So we remember the last keys we iterated to and restore</em>
+<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_comment"> the reseeked set to at least that point.</em>
+<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="128" href="#128">128</a> iter = segment.tailSet(getHighest(cell, last)).iterator();
+<a class="jxr_linenumber" name="129" href="#129">129</a> current = getNext();
+<a class="jxr_linenumber" name="130" href="#130">130</a> <strong class="jxr_keyword">return</strong> (current != <strong class="jxr_keyword">null</strong>);
+<a class="jxr_linenumber" name="131" href="#131">131</a> }
+<a class="jxr_linenumber" name="132" href="#132">132</a>
+<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * Seek the scanner at or before the row of specified Cell, it firstly</em>
+<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment"> * tries to seek the scanner at or after the specified Cell, return if</em>
+<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * peek KeyValue of scanner has the same row with specified Cell,</em>
+<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * otherwise seek the scanner at the first Cell of the row which is the</em>
+<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> * previous row of specified KeyValue</em>
+<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment"> * @param key seek Cell</em>
+<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment"> * @return true if the scanner is at the valid KeyValue, false if such Cell does not exist</em>
+<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="143" href="#143">143</a> @Override
+<a class="jxr_linenumber" name="144" href="#144">144</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> backwardSeek(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> key) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="145" href="#145">145</a> seek(key); <em class="jxr_comment">// seek forward then go backward</em>
+<a class="jxr_linenumber" name="146" href="#146">146</a> <strong class="jxr_keyword">if</strong> (peek() == <strong class="jxr_keyword">null</strong> || segment.compareRows(peek(), key) > 0) {
+<a class="jxr_linenumber" name="147" href="#147">147</a> <strong class="jxr_keyword">return</strong> seekToPreviousRow(key);
+<a class="jxr_linenumber" name="148" href="#148">148</a> }
+<a class="jxr_linenumber" name="149" href="#149">149</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="150" href="#150">150</a> }
<a class="jxr_linenumber" name="151" href="#151">151</a>
-<a class="jxr_linenumber" name="152" href="#152">152</a> }
+<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_javadoccomment"> * Seek the scanner at the first Cell of the row which is the previous row</em>
+<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment"> * of specified key</em>
+<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment"> * @param cell seek value</em>
+<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment"> * @return true if the scanner at the first valid Cell of previous row,</em>
+<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment"> * false if not existing such Cell</em>
+<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="160" href="#160">160</a> @Override
+<a class="jxr_linenumber" name="161" href="#161">161</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> seekToPreviousRow(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> cell) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="162" href="#162">162</a> <strong class="jxr_keyword">boolean</strong> keepSeeking = false;
+<a class="jxr_linenumber" name="163" href="#163">163</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> key = cell;
+<a class="jxr_linenumber" name="164" href="#164">164</a>
+<a class="jxr_linenumber" name="165" href="#165">165</a> <strong class="jxr_keyword">do</strong> {
+<a class="jxr_linenumber" name="166" href="#166">166</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> firstKeyOnRow = CellUtil.createFirstOnRow(key);
+<a class="jxr_linenumber" name="167" href="#167">167</a> SortedSet<Cell> cellHead = segment.headSet(firstKeyOnRow);
+<a class="jxr_linenumber" name="168" href="#168">168</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> lastCellBeforeRow = cellHead.isEmpty() ? <strong class="jxr_keyword">null</strong> : cellHead.last();
+<a class="jxr_linenumber" name="169" href="#169">169</a> <strong class="jxr_keyword">if</strong> (lastCellBeforeRow == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="170" href="#170">170</a> current = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="171" href="#171">171</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="172" href="#172">172</a> }
+<a class="jxr_linenumber" name="173" href="#173">173</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> firstKeyOnPreviousRow = CellUtil.createFirstOnRow(lastCellBeforeRow);
+<a class="jxr_linenumber" name="174" href="#174">174</a> <strong class="jxr_keyword">this</strong>.stopSkippingKVsIfNextRow = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="175" href="#175">175</a> seek(firstKeyOnPreviousRow);
+<a class="jxr_linenumber" name="176" href="#176">176</a> <strong class="jxr_keyword">this</strong>.stopSkippingKVsIfNextRow = false;
+<a class="jxr_linenumber" name="177" href="#177">177</a> <strong class="jxr_keyword">if</strong> (peek() == <strong class="jxr_keyword">null</strong>
+<a class="jxr_linenumber" name="178" href="#178">178</a> || segment.getComparator().compareRows(peek(), firstKeyOnPreviousRow) > 0) {
+<a class="jxr_linenumber" name="179" href="#179">179</a> keepSeeking = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="180" href="#180">180</a> key = firstKeyOnPreviousRow;
+<a class="jxr_linenumber" name="181" href="#181">181</a> <strong class="jxr_keyword">continue</strong>;
+<a class="jxr_linenumber" name="182" href="#182">182</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="183" href="#183">183</a> keepSeeking = false;
+<a class="jxr_linenumber" name="184" href="#184">184</a> }
+<a class="jxr_linenumber" name="185" href="#185">185</a> } <strong class="jxr_keyword">while</strong> (keepSeeking);
+<a class="jxr_linenumber" name="186" href="#186">186</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="187" href="#187">187</a> }
+<a class="jxr_linenumber" name="188" href="#188">188</a>
+<a class="jxr_linenumber" name="189" href="#189">189</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="190" href="#190">190</a> <em class="jxr_javadoccomment"> * Seek the scanner at the first KeyValue of last row</em>
+<a class="jxr_linenumber" name="191" href="#191">191</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_javadoccomment"> * @return true if scanner has values left, false if the underlying data is empty</em>
+<a class="jxr_linenumber" name="193" href="#193">193</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="194" href="#194">194</a> @Override
+<a class="jxr_linenumber" name="195" href="#195">195</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> seekToLastRow() <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="196" href="#196">196</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> higherCell = segment.isEmpty() ? <strong class="jxr_keyword">null</strong> : segment.last();
+<a class="jxr_linenumber" name="197" href="#197">197</a> <strong class="jxr_keyword">if</strong> (higherCell == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="198" href="#198">198</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="199" href="#199">199</a> }
+<a class="jxr_linenumber" name="200" href="#200">200</a>
+<a class="jxr_linenumber" name="201" href="#201">201</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> firstCellOnLastRow = CellUtil.createFirstOnRow(higherCell);
+<a class="jxr_linenumber" name="202" href="#202">202</a>
+<a class="jxr_linenumber" name="203" href="#203">203</a> <strong class="jxr_keyword">if</strong> (seek(firstCellOnLastRow)) {
+<a class="jxr_linenumber" name="204" href="#204">204</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="205" href="#205">205</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="206" href="#206">206</a> <strong class="jxr_keyword">return</strong> seekToPreviousRow(higherCell);
+<a class="jxr_linenumber" name="207" href="#207">207</a> }
+<a class="jxr_linenumber" name="208" href="#208">208</a> }
+<a class="jxr_linenumber" name="209" href="#209">209</a>
+<a class="jxr_linenumber" name="210" href="#210">210</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="211" href="#211">211</a> <em class="jxr_javadoccomment"> * Get the sequence id associated with this KeyValueScanner. This is required</em>
+<a class="jxr_linenumber" name="212" href="#212">212</a> <em class="jxr_javadoccomment"> * for comparing multiple files (or memstore segments) scanners to find out</em>
+<a class="jxr_linenumber" name="213" href="#213">213</a> <em class="jxr_javadoccomment"> * which one has the latest data.</em>
+<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="215" href="#215">215</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="216" href="#216">216</a> @Override
+<a class="jxr_linenumber" name="217" href="#217">217</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> getSequenceID() {
+<a class="jxr_linenumber" name="218" href="#218">218</a> <strong class="jxr_keyword">return</strong> sequenceID;
+<a class="jxr_linenumber" name="219" href="#219">219</a> }
+<a class="jxr_linenumber" name="220" href="#220">220</a>
+<a class="jxr_linenumber" name="221" href="#221">221</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="222" href="#222">222</a> <em class="jxr_javadoccomment"> * Close the KeyValue scanner.</em>
+<a class="jxr_linenumber" name="223" href="#223">223</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="224" href="#224">224</a> @Override
+<a class="jxr_linenumber" name="225" href="#225">225</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close() {
+<a class="jxr_linenumber" name="226" href="#226">226</a> getSegment().decScannerCount();
+<a class="jxr_linenumber" name="227" href="#227">227</a> }
+<a class="jxr_linenumber" name="228" href="#228">228</a>
+<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment"> * This functionality should be resolved in the higher level which is</em>
+<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment"> * MemStoreScanner, currently returns true as default. Doesn't throw</em>
+<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment"> * IllegalStateException in order not to change the signature of the</em>
+<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment"> * overridden method</em>
+<a class="jxr_linenumber" name="234" href="#234">234</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="235" href="#235">235</a> @Override
+<a class="jxr_linenumber" name="236" href="#236">236</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> shouldUseScanner(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html">Scan</a> scan, <a href="../../../../../org/apache/hadoop/hbase/regionserver/Store.html">Store</a> store, <strong class="jxr_keyword">long</strong> oldestUnexpiredTS) {
+<a class="jxr_linenumber" name="237" href="#237">237</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="238" href="#238">238</a> }
+<a class="jxr_linenumber" name="239" href="#239">239</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="240" href="#240">240</a> <em class="jxr_javadoccomment"> * This scanner is working solely on the in-memory MemStore therefore this</em>
+<a class="jxr_linenumber" name="241" href="#241">241</a> <em class="jxr_javadoccomment"> * interface is not relevant.</em>
+<a class="jxr_linenumber" name="242" href="#242">242</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="243" href="#243">243</a> @Override
+<a class="jxr_linenumber" name="244" href="#244">244</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> requestSeek(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> c, <strong class="jxr_keyword">boolean</strong> forward, <strong class="jxr_keyword">boolean</strong> useBloom)
+<a class="jxr_linenumber" name="245" href="#245">245</a> <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="246" href="#246">246</a>
+<a class="jxr_linenumber" name="247" href="#247">247</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
+<a class="jxr_linenumber" name="248" href="#248">248</a> <span class="jxr_string">"requestSeek cannot be called on MutableCellSetSegmentScanner"</span>);
+<a class="jxr_linenumber" name="249" href="#249">249</a> }
+<a class="jxr_linenumber" name="250" href="#250">250</a>
+<a class="jxr_linenumber" name="251" href="#251">251</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="252" href="#252">252</a> <em class="jxr_javadoccomment"> * This scanner is working solely on the in-memory MemStore and doesn't work on</em>
+<a class="jxr_linenumber" name="253" href="#253">253</a> <em class="jxr_javadoccomment"> * store files, MutableCellSetSegmentScanner always does the seek,</em>
+<a class="jxr_linenumber" name="254" href="#254">254</a> <em class="jxr_javadoccomment"> * therefore always returning true.</em>
+<a class="jxr_linenumber" name="255" href="#255">255</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="256" href="#256">256</a> @Override
+<a class="jxr_linenumber" name="257" href="#257">257</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> realSeekDone() {
+<a class="jxr_linenumber" name="258" href="#258">258</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="259" href="#259">259</a> }
+<a class="jxr_linenumber" name="260" href="#260">260</a>
+<a class="jxr_linenumber" name="261" href="#261">261</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="262" href="#262">262</a> <em class="jxr_javadoccomment"> * This function should be never called on scanners that always do real seek operations (i.e. most</em>
+<a class="jxr_linenumber" name="263" href="#263">263</a> <em class="jxr_javadoccomment"> * of the scanners and also this one). The easiest way to achieve this is to call</em>
+<a class="jxr_linenumber" name="264" href="#264">264</a> <em class="jxr_javadoccomment"> * {@link #realSeekDone()} first.</em>
+<a class="jxr_linenumber" name="265" href="#265">265</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="266" href="#266">266</a> @Override
+<a class="jxr_linenumber" name="267" href="#267">267</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> enforceSeek() <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="268" href="#268">268</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
+<a class="jxr_linenumber" name="269" href="#269">269</a> <span class="jxr_string">"enforceSeek cannot be called on MutableCellSetSegmentScanner"</span>);
+<a class="jxr_linenumber" name="270" href="#270">270</a> }
+<a class="jxr_linenumber" name="271" href="#271">271</a>
+<a class="jxr_linenumber" name="272" href="#272">272</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="273" href="#273">273</a> <em class="jxr_javadoccomment"> * @return true if this is a file scanner. Otherwise a memory scanner is assumed.</em>
+<a class="jxr_linenumber" name="274" href="#274">274</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="275" href="#275">275</a> @Override
+<a class="jxr_linenumber" name="276" href="#276">276</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isFileScanner() {
+<a class="jxr_linenumber" name="277" href="#277">277</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="278" href="#278">278</a> }
+<a class="jxr_linenumber" name="279" href="#279">279</a>
+<a class="jxr_linenumber" name="280" href="#280">280</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="281" href="#281">281</a> <em class="jxr_javadoccomment"> * @return the next key in the index (the key to seek to the next block)</em>
+<a class="jxr_linenumber" name="282" href="#282">282</a> <em class="jxr_javadoccomment"> * if known, or null otherwise</em>
+<a class="jxr_linenumber" name="283" href="#283">283</a> <em class="jxr_javadoccomment"> * Not relevant for in-memory scanner</em>
+<a class="jxr_linenumber" name="284" href="#284">284</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="285" href="#285">285</a> @Override
+<a class="jxr_linenumber" name="286" href="#286">286</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> getNextIndexedKey() {
+<a class="jxr_linenumber" name="287" href="#287">287</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="288" href="#288">288</a> }
+<a class="jxr_linenumber" name="289" href="#289">289</a>
+<a class="jxr_linenumber" name="290" href="#290">290</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="291" href="#291">291</a> <em class="jxr_javadoccomment"> * Called after a batch of rows scanned (RPC) and set to be returned to client. Any in between</em>
+<a class="jxr_linenumber" name="292" href="#292">292</a> <em class="jxr_javadoccomment"> * cleanup can be done here. Nothing to be done for MutableCellSetSegmentScanner.</em>
+<a class="jxr_linenumber" name="293" href="#293">293</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="294" href="#294">294</a> @Override
+<a class="jxr_linenumber" name="295" href="#295">295</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> shipped() <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="296" href="#296">296</a> <em class="jxr_comment">// do nothing</em>
+<a class="jxr_linenumber" name="297" href="#297">297</a> }
+<a class="jxr_linenumber" name="298" href="#298">298</a>
+<a class="jxr_linenumber" name="299" href="#299">299</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="300" href="#300">300</a> <em class="jxr_javadoccomment"> * Set the sequence id of the scanner.</em>
+<a class="jxr_linenumber" name="301" href="#301">301</a> <em class="jxr_javadoccomment"> * This is used to determine an order between memory segment scanners.</em>
+<a class="jxr_linenumber" name="302" href="#302">302</a> <em class="jxr_javadoccomment"> * @param x a unique sequence id</em>
+<a class="jxr_linenumber" name="303" href="#303">303</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="304" href="#304">304</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setSequenceID(<strong class="jxr_keyword">long</strong> x) {
+<a class="jxr_linenumber" name="305" href="#305">305</a> sequenceID = x;
+<a class="jxr_linenumber" name="306" href="#306">306</a> }
+<a class="jxr_linenumber" name="307" href="#307">307</a>
+<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment"> * Returns whether the given scan should seek in this segment</em>
+<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment"> * @return whether the given scan should seek in this segment</em>
+<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="312" href="#312">312</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> shouldSeek(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html">Scan</a> scan, <strong class="jxr_keyword">long</strong> oldestUnexpiredTS) {
+<a class="jxr_linenumber" name="313" href="#313">313</a> <strong class="jxr_keyword">return</strong> getSegment().shouldSeek(scan,oldestUnexpiredTS);
+<a class="jxr_linenumber" name="314" href="#314">314</a> }
+<a class="jxr_linenumber" name="315" href="#315">315</a>
+<a class="jxr_linenumber" name="316" href="#316">316</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html">Segment</a> getSegment(){
+<a class="jxr_linenumber" name="317" href="#317">317</a> <strong class="jxr_keyword">return</strong> segment;
+<a class="jxr_linenumber" name="318" href="#318">318</a> }
+<a class="jxr_linenumber" name="319" href="#319">319</a>
+<a class="jxr_linenumber" name="320" href="#320">320</a> <em class="jxr_comment">//debug method</em>
+<a class="jxr_linenumber" name="321" href="#321">321</a> @Override
+<a class="jxr_linenumber" name="322" href="#322">322</a> <strong class="jxr_keyword">public</strong> String toString() {
+<a class="jxr_linenumber" name="323" href="#323">323</a> String res = <span class="jxr_string">"Store segment scanner of type "</span>+<strong class="jxr_keyword">this</strong>.getClass().getName()+<span class="jxr_string">"; "</span>;
+<a class="jxr_linenumber" name="324" href="#324">324</a> res += <span class="jxr_string">"sequence id "</span>+getSequenceID()+<span class="jxr_string">"; "</span>;
+<a class="jxr_linenumber" name="325" href="#325">325</a> res += getSegment().toString();
+<a class="jxr_linenumber" name="326" href="#326">326</a> <strong class="jxr_keyword">return</strong> res;
+<a class="jxr_linenumber" name="327" href="#327">327</a> }
+<a class="jxr_linenumber" name="328" href="#328">328</a>
+<a class="jxr_linenumber" name="329" href="#329">329</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment">******************* <a href="../../../../../org/apache/hadoop/hbase/classification/InterfaceAudience.html">Private</a> Methods **********************/</em>
+<a class="jxr_linenumber" name="330" href="#330">330</a>
+<a class="jxr_linenumber" name="331" href="#331">331</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="332" href="#332">332</a> <em class="jxr_javadoccomment"> * Private internal method for iterating over the segment,</em>
+<a class="jxr_linenumber" name="333" href="#333">333</a> <em class="jxr_javadoccomment"> * skipping the cells with irrelevant MVCC</em>
+<a class="jxr_linenumber" name="334" href="#334">334</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="335" href="#335">335</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> getNext() {
+<a class="jxr_linenumber" name="336" href="#336">336</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> startKV = current;
+<a class="jxr_linenumber" name="337" href="#337">337</a> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> next = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="338" href="#338">338</a>
+<a class="jxr_linenumber" name="339" href="#339">339</a> <strong class="jxr_keyword">try</strong> {
+<a class="jxr_linenumber" name="340" href="#340">340</a> <strong class="jxr_keyword">while</strong> (iter.hasNext()) {
+<a class="jxr_linenumber" name="341" href="#341">341</a> next = iter.next();
+<a class="jxr_linenumber" name="342" href="#342">342</a> <strong class="jxr_keyword">if</strong> (next.getSequenceId() <= <strong class="jxr_keyword">this</strong>.readPoint) {
+<a class="jxr_linenumber" name="343" href="#343">343</a> <strong class="jxr_keyword">return</strong> next; <em class="jxr_comment">// skip irrelevant versions</em>
+<a class="jxr_linenumber" name="344" href="#344">344</a> }
+<a class="jxr_linenumber" name="345" href="#345">345</a> <strong class="jxr_keyword">if</strong> (stopSkippingKVsIfNextRow && <em class="jxr_comment">// for backwardSeek() stay in the</em>
+<a class="jxr_linenumber" name="346" href="#346">346</a> startKV != <strong class="jxr_keyword">null</strong> && <em class="jxr_comment">// boundaries of a single row</em>
+<a class="jxr_linenumber" name="347" href="#347">347</a> segment.compareRows(next, startKV) > 0) {
+<a class="jxr_linenumber" name="348" href="#348">348</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="349" href="#349">349</a> }
+<a class="jxr_linenumber" name="350" href="#350">350</a> } <em class="jxr_comment">// end of while</em>
+<a class="jxr_linenumber" name="351" href="#351">351</a>
+<a class="jxr_linenumber" name="352" href="#352">352</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>; <em class="jxr_comment">// nothing found</em>
+<a class="jxr_linenumber" name="353" href="#353">353</a> } <strong class="jxr_keyword">finally</strong> {
+<a class="jxr_linenumber" name="354" href="#354">354</a> <strong class="jxr_keyword">if</strong> (next != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="355" href="#355">355</a> <em class="jxr_comment">// in all cases, remember the last KV we iterated to, needed for reseek()</em>
+<a class="jxr_linenumber" name="356" href="#356">356</a> last = next;
+<a class="jxr_linenumber" name="357" href="#357">357</a> }
+<a class="jxr_linenumber" name="358" href="#358">358</a> }
+<a class="jxr_linenumber" name="359" href="#359">359</a> }
+<a class="jxr_linenumber" name="360" href="#360">360</a>
+<a class="jxr_linenumber" name="361" href="#361">361</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="362" href="#362">362</a> <em class="jxr_javadoccomment"> * Private internal method that returns the higher of the two key values, or null</em>
+<a class="jxr_linenumber" name="363" href="#363">363</a> <em class="jxr_javadoccomment"> * if they are both null</em>
+<a class="jxr_linenumber" name="364" href="#364">364</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="365" href="#365">365</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> getHighest(<a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> first, <a href="../../../../../org/apache/hadoop/hbase/Cell.html">Cell</a> second) {
+<a class="jxr_linenumber" name="366" href="#366">366</a> <strong class="jxr_keyword">if</strong> (first == <strong class="jxr_keyword">null</strong> && second == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="367" href="#367">367</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="368" href="#368">368</a> }
+<a class="jxr_linenumber" name="369" href="#369">369</a> <strong class="jxr_keyword">if</strong> (first != <strong class="jxr_keyword">null</strong> && second != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="370" href="#370">370</a> <strong class="jxr_keyword">int</strong> compare = segment.compare(first, second);
+<a class="jxr_linenumber" name="371" href="#371">371</a> <strong class="jxr_keyword">return</strong> (compare > 0 ? first : second);
+<a class="jxr_linenumber" name="372" href="#372">372</a> }
+<a class="jxr_linenumber" name="373" href="#373">373</a> <strong class="jxr_keyword">return</strong> (first != <strong class="jxr_keyword">null</strong> ? first : second);
+<a class="jxr_linenumber" name="374" href="#374">374</a> }
+<a class="jxr_linenumber" name="375" href="#375">375</a>
+<a class="jxr_linenumber" name="376" href="#376">376</a> }
</pre>
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