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From git-site-r...@apache.org
Subject [19/51] [partial] hbase-site git commit: Published site at .
Date Wed, 20 Dec 2017 15:18:29 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/d0f1a9f6/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatImpl.RecordReader.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatImpl.RecordReader.html b/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatImpl.RecordReader.html
index b1892fa..a11100d 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatImpl.RecordReader.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatImpl.RecordReader.html
@@ -78,7 +78,7 @@
 <span class="sourceLineNo">070</span>  // key for specifying the root dir of the restored snapshot<a name="line.70"></a>
 <span class="sourceLineNo">071</span>  protected static final String RESTORE_DIR_KEY = "hbase.TableSnapshotInputFormat.restore.dir";<a name="line.71"></a>
 <span class="sourceLineNo">072</span><a name="line.72"></a>
-<span class="sourceLineNo">073</span>  /** See {@link #getBestLocations(Configuration, HDFSBlocksDistribution)} */<a name="line.73"></a>
+<span class="sourceLineNo">073</span>  /** See {@link #getBestLocations(Configuration, HDFSBlocksDistribution, int)} */<a name="line.73"></a>
 <span class="sourceLineNo">074</span>  private static final String LOCALITY_CUTOFF_MULTIPLIER =<a name="line.74"></a>
 <span class="sourceLineNo">075</span>    "hbase.tablesnapshotinputformat.locality.cutoff.multiplier";<a name="line.75"></a>
 <span class="sourceLineNo">076</span>  private static final float DEFAULT_LOCALITY_CUTOFF_MULTIPLIER = 0.8f;<a name="line.76"></a>
@@ -95,417 +95,456 @@
 <span class="sourceLineNo">087</span>  public static final String NUM_SPLITS_PER_REGION = "hbase.mapreduce.splits.per.region";<a name="line.87"></a>
 <span class="sourceLineNo">088</span><a name="line.88"></a>
 <span class="sourceLineNo">089</span>  /**<a name="line.89"></a>
-<span class="sourceLineNo">090</span>   * Implementation class for InputSplit logic common between mapred and mapreduce.<a name="line.90"></a>
-<span class="sourceLineNo">091</span>   */<a name="line.91"></a>
-<span class="sourceLineNo">092</span>  public static class InputSplit implements Writable {<a name="line.92"></a>
-<span class="sourceLineNo">093</span><a name="line.93"></a>
-<span class="sourceLineNo">094</span>    private TableDescriptor htd;<a name="line.94"></a>
-<span class="sourceLineNo">095</span>    private HRegionInfo regionInfo;<a name="line.95"></a>
-<span class="sourceLineNo">096</span>    private String[] locations;<a name="line.96"></a>
-<span class="sourceLineNo">097</span>    private String scan;<a name="line.97"></a>
-<span class="sourceLineNo">098</span>    private String restoreDir;<a name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span>    // constructor for mapreduce framework / Writable<a name="line.100"></a>
-<span class="sourceLineNo">101</span>    public InputSplit() {}<a name="line.101"></a>
-<span class="sourceLineNo">102</span><a name="line.102"></a>
-<span class="sourceLineNo">103</span>    public InputSplit(TableDescriptor htd, HRegionInfo regionInfo, List&lt;String&gt; locations,<a name="line.103"></a>
-<span class="sourceLineNo">104</span>        Scan scan, Path restoreDir) {<a name="line.104"></a>
-<span class="sourceLineNo">105</span>      this.htd = htd;<a name="line.105"></a>
-<span class="sourceLineNo">106</span>      this.regionInfo = regionInfo;<a name="line.106"></a>
-<span class="sourceLineNo">107</span>      if (locations == null || locations.isEmpty()) {<a name="line.107"></a>
-<span class="sourceLineNo">108</span>        this.locations = new String[0];<a name="line.108"></a>
-<span class="sourceLineNo">109</span>      } else {<a name="line.109"></a>
-<span class="sourceLineNo">110</span>        this.locations = locations.toArray(new String[locations.size()]);<a name="line.110"></a>
-<span class="sourceLineNo">111</span>      }<a name="line.111"></a>
-<span class="sourceLineNo">112</span>      try {<a name="line.112"></a>
-<span class="sourceLineNo">113</span>        this.scan = scan != null ? TableMapReduceUtil.convertScanToString(scan) : "";<a name="line.113"></a>
-<span class="sourceLineNo">114</span>      } catch (IOException e) {<a name="line.114"></a>
-<span class="sourceLineNo">115</span>        LOG.warn("Failed to convert Scan to String", e);<a name="line.115"></a>
-<span class="sourceLineNo">116</span>      }<a name="line.116"></a>
-<span class="sourceLineNo">117</span><a name="line.117"></a>
-<span class="sourceLineNo">118</span>      this.restoreDir = restoreDir.toString();<a name="line.118"></a>
-<span class="sourceLineNo">119</span>    }<a name="line.119"></a>
-<span class="sourceLineNo">120</span><a name="line.120"></a>
-<span class="sourceLineNo">121</span>    public TableDescriptor getHtd() {<a name="line.121"></a>
-<span class="sourceLineNo">122</span>      return htd;<a name="line.122"></a>
-<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
-<span class="sourceLineNo">124</span><a name="line.124"></a>
-<span class="sourceLineNo">125</span>    public String getScan() {<a name="line.125"></a>
-<span class="sourceLineNo">126</span>      return scan;<a name="line.126"></a>
-<span class="sourceLineNo">127</span>    }<a name="line.127"></a>
-<span class="sourceLineNo">128</span><a name="line.128"></a>
-<span class="sourceLineNo">129</span>    public String getRestoreDir() {<a name="line.129"></a>
-<span class="sourceLineNo">130</span>      return restoreDir;<a name="line.130"></a>
-<span class="sourceLineNo">131</span>    }<a name="line.131"></a>
-<span class="sourceLineNo">132</span><a name="line.132"></a>
-<span class="sourceLineNo">133</span>    public long getLength() {<a name="line.133"></a>
-<span class="sourceLineNo">134</span>      //TODO: We can obtain the file sizes of the snapshot here.<a name="line.134"></a>
-<span class="sourceLineNo">135</span>      return 0;<a name="line.135"></a>
+<span class="sourceLineNo">090</span>   * Whether to calculate the block location for splits. Default to true.<a name="line.90"></a>
+<span class="sourceLineNo">091</span>   * If the computing layer runs outside of HBase cluster, the block locality does not master.<a name="line.91"></a>
+<span class="sourceLineNo">092</span>   * Setting this value to false could skip the calculation and save some time.<a name="line.92"></a>
+<span class="sourceLineNo">093</span>   *<a name="line.93"></a>
+<span class="sourceLineNo">094</span>   * Set access modifier to "public" so that these could be accessed by test classes of<a name="line.94"></a>
+<span class="sourceLineNo">095</span>   * both org.apache.hadoop.hbase.mapred<a name="line.95"></a>
+<span class="sourceLineNo">096</span>   * and  org.apache.hadoop.hbase.mapreduce.<a name="line.96"></a>
+<span class="sourceLineNo">097</span>   */<a name="line.97"></a>
+<span class="sourceLineNo">098</span>  public static final String  SNAPSHOT_INPUTFORMAT_LOCALITY_ENABLED_KEY =<a name="line.98"></a>
+<span class="sourceLineNo">099</span>      "hbase.TableSnapshotInputFormat.locality.enabled";<a name="line.99"></a>
+<span class="sourceLineNo">100</span>  public static final boolean SNAPSHOT_INPUTFORMAT_LOCALITY_ENABLED_DEFAULT = true;<a name="line.100"></a>
+<span class="sourceLineNo">101</span><a name="line.101"></a>
+<span class="sourceLineNo">102</span>  /**<a name="line.102"></a>
+<span class="sourceLineNo">103</span>   * Implementation class for InputSplit logic common between mapred and mapreduce.<a name="line.103"></a>
+<span class="sourceLineNo">104</span>   */<a name="line.104"></a>
+<span class="sourceLineNo">105</span>  public static class InputSplit implements Writable {<a name="line.105"></a>
+<span class="sourceLineNo">106</span><a name="line.106"></a>
+<span class="sourceLineNo">107</span>    private TableDescriptor htd;<a name="line.107"></a>
+<span class="sourceLineNo">108</span>    private HRegionInfo regionInfo;<a name="line.108"></a>
+<span class="sourceLineNo">109</span>    private String[] locations;<a name="line.109"></a>
+<span class="sourceLineNo">110</span>    private String scan;<a name="line.110"></a>
+<span class="sourceLineNo">111</span>    private String restoreDir;<a name="line.111"></a>
+<span class="sourceLineNo">112</span><a name="line.112"></a>
+<span class="sourceLineNo">113</span>    // constructor for mapreduce framework / Writable<a name="line.113"></a>
+<span class="sourceLineNo">114</span>    public InputSplit() {}<a name="line.114"></a>
+<span class="sourceLineNo">115</span><a name="line.115"></a>
+<span class="sourceLineNo">116</span>    public InputSplit(TableDescriptor htd, HRegionInfo regionInfo, List&lt;String&gt; locations,<a name="line.116"></a>
+<span class="sourceLineNo">117</span>        Scan scan, Path restoreDir) {<a name="line.117"></a>
+<span class="sourceLineNo">118</span>      this.htd = htd;<a name="line.118"></a>
+<span class="sourceLineNo">119</span>      this.regionInfo = regionInfo;<a name="line.119"></a>
+<span class="sourceLineNo">120</span>      if (locations == null || locations.isEmpty()) {<a name="line.120"></a>
+<span class="sourceLineNo">121</span>        this.locations = new String[0];<a name="line.121"></a>
+<span class="sourceLineNo">122</span>      } else {<a name="line.122"></a>
+<span class="sourceLineNo">123</span>        this.locations = locations.toArray(new String[locations.size()]);<a name="line.123"></a>
+<span class="sourceLineNo">124</span>      }<a name="line.124"></a>
+<span class="sourceLineNo">125</span>      try {<a name="line.125"></a>
+<span class="sourceLineNo">126</span>        this.scan = scan != null ? TableMapReduceUtil.convertScanToString(scan) : "";<a name="line.126"></a>
+<span class="sourceLineNo">127</span>      } catch (IOException e) {<a name="line.127"></a>
+<span class="sourceLineNo">128</span>        LOG.warn("Failed to convert Scan to String", e);<a name="line.128"></a>
+<span class="sourceLineNo">129</span>      }<a name="line.129"></a>
+<span class="sourceLineNo">130</span><a name="line.130"></a>
+<span class="sourceLineNo">131</span>      this.restoreDir = restoreDir.toString();<a name="line.131"></a>
+<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
+<span class="sourceLineNo">133</span><a name="line.133"></a>
+<span class="sourceLineNo">134</span>    public TableDescriptor getHtd() {<a name="line.134"></a>
+<span class="sourceLineNo">135</span>      return htd;<a name="line.135"></a>
 <span class="sourceLineNo">136</span>    }<a name="line.136"></a>
 <span class="sourceLineNo">137</span><a name="line.137"></a>
-<span class="sourceLineNo">138</span>    public String[] getLocations() {<a name="line.138"></a>
-<span class="sourceLineNo">139</span>      return locations;<a name="line.139"></a>
+<span class="sourceLineNo">138</span>    public String getScan() {<a name="line.138"></a>
+<span class="sourceLineNo">139</span>      return scan;<a name="line.139"></a>
 <span class="sourceLineNo">140</span>    }<a name="line.140"></a>
 <span class="sourceLineNo">141</span><a name="line.141"></a>
-<span class="sourceLineNo">142</span>    public TableDescriptor getTableDescriptor() {<a name="line.142"></a>
-<span class="sourceLineNo">143</span>      return htd;<a name="line.143"></a>
+<span class="sourceLineNo">142</span>    public String getRestoreDir() {<a name="line.142"></a>
+<span class="sourceLineNo">143</span>      return restoreDir;<a name="line.143"></a>
 <span class="sourceLineNo">144</span>    }<a name="line.144"></a>
 <span class="sourceLineNo">145</span><a name="line.145"></a>
-<span class="sourceLineNo">146</span>    public HRegionInfo getRegionInfo() {<a name="line.146"></a>
-<span class="sourceLineNo">147</span>      return regionInfo;<a name="line.147"></a>
-<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
-<span class="sourceLineNo">149</span><a name="line.149"></a>
-<span class="sourceLineNo">150</span>    // TODO: We should have ProtobufSerialization in Hadoop, and directly use PB objects instead of<a name="line.150"></a>
-<span class="sourceLineNo">151</span>    // doing this wrapping with Writables.<a name="line.151"></a>
-<span class="sourceLineNo">152</span>    @Override<a name="line.152"></a>
-<span class="sourceLineNo">153</span>    public void write(DataOutput out) throws IOException {<a name="line.153"></a>
-<span class="sourceLineNo">154</span>      TableSnapshotRegionSplit.Builder builder = TableSnapshotRegionSplit.newBuilder()<a name="line.154"></a>
-<span class="sourceLineNo">155</span>          .setTable(ProtobufUtil.toTableSchema(htd))<a name="line.155"></a>
-<span class="sourceLineNo">156</span>          .setRegion(HRegionInfo.convert(regionInfo));<a name="line.156"></a>
-<span class="sourceLineNo">157</span><a name="line.157"></a>
-<span class="sourceLineNo">158</span>      for (String location : locations) {<a name="line.158"></a>
-<span class="sourceLineNo">159</span>        builder.addLocations(location);<a name="line.159"></a>
-<span class="sourceLineNo">160</span>      }<a name="line.160"></a>
-<span class="sourceLineNo">161</span><a name="line.161"></a>
-<span class="sourceLineNo">162</span>      TableSnapshotRegionSplit split = builder.build();<a name="line.162"></a>
-<span class="sourceLineNo">163</span><a name="line.163"></a>
-<span class="sourceLineNo">164</span>      ByteArrayOutputStream baos = new ByteArrayOutputStream();<a name="line.164"></a>
-<span class="sourceLineNo">165</span>      split.writeTo(baos);<a name="line.165"></a>
-<span class="sourceLineNo">166</span>      baos.close();<a name="line.166"></a>
-<span class="sourceLineNo">167</span>      byte[] buf = baos.toByteArray();<a name="line.167"></a>
-<span class="sourceLineNo">168</span>      out.writeInt(buf.length);<a name="line.168"></a>
-<span class="sourceLineNo">169</span>      out.write(buf);<a name="line.169"></a>
+<span class="sourceLineNo">146</span>    public long getLength() {<a name="line.146"></a>
+<span class="sourceLineNo">147</span>      //TODO: We can obtain the file sizes of the snapshot here.<a name="line.147"></a>
+<span class="sourceLineNo">148</span>      return 0;<a name="line.148"></a>
+<span class="sourceLineNo">149</span>    }<a name="line.149"></a>
+<span class="sourceLineNo">150</span><a name="line.150"></a>
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+<span class="sourceLineNo">152</span>      return locations;<a name="line.152"></a>
+<span class="sourceLineNo">153</span>    }<a name="line.153"></a>
+<span class="sourceLineNo">154</span><a name="line.154"></a>
+<span class="sourceLineNo">155</span>    public TableDescriptor getTableDescriptor() {<a name="line.155"></a>
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+<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
+<span class="sourceLineNo">158</span><a name="line.158"></a>
+<span class="sourceLineNo">159</span>    public HRegionInfo getRegionInfo() {<a name="line.159"></a>
+<span class="sourceLineNo">160</span>      return regionInfo;<a name="line.160"></a>
+<span class="sourceLineNo">161</span>    }<a name="line.161"></a>
+<span class="sourceLineNo">162</span><a name="line.162"></a>
+<span class="sourceLineNo">163</span>    // TODO: We should have ProtobufSerialization in Hadoop, and directly use PB objects instead of<a name="line.163"></a>
+<span class="sourceLineNo">164</span>    // doing this wrapping with Writables.<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    @Override<a name="line.165"></a>
+<span class="sourceLineNo">166</span>    public void write(DataOutput out) throws IOException {<a name="line.166"></a>
+<span class="sourceLineNo">167</span>      TableSnapshotRegionSplit.Builder builder = TableSnapshotRegionSplit.newBuilder()<a name="line.167"></a>
+<span class="sourceLineNo">168</span>          .setTable(ProtobufUtil.toTableSchema(htd))<a name="line.168"></a>
+<span class="sourceLineNo">169</span>          .setRegion(HRegionInfo.convert(regionInfo));<a name="line.169"></a>
 <span class="sourceLineNo">170</span><a name="line.170"></a>
-<span class="sourceLineNo">171</span>      Bytes.writeByteArray(out, Bytes.toBytes(scan));<a name="line.171"></a>
-<span class="sourceLineNo">172</span>      Bytes.writeByteArray(out, Bytes.toBytes(restoreDir));<a name="line.172"></a>
-<span class="sourceLineNo">173</span><a name="line.173"></a>
-<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
-<span class="sourceLineNo">175</span><a name="line.175"></a>
-<span class="sourceLineNo">176</span>    @Override<a name="line.176"></a>
-<span class="sourceLineNo">177</span>    public void readFields(DataInput in) throws IOException {<a name="line.177"></a>
-<span class="sourceLineNo">178</span>      int len = in.readInt();<a name="line.178"></a>
-<span class="sourceLineNo">179</span>      byte[] buf = new byte[len];<a name="line.179"></a>
-<span class="sourceLineNo">180</span>      in.readFully(buf);<a name="line.180"></a>
-<span class="sourceLineNo">181</span>      TableSnapshotRegionSplit split = TableSnapshotRegionSplit.PARSER.parseFrom(buf);<a name="line.181"></a>
-<span class="sourceLineNo">182</span>      this.htd = ProtobufUtil.toTableDescriptor(split.getTable());<a name="line.182"></a>
-<span class="sourceLineNo">183</span>      this.regionInfo = HRegionInfo.convert(split.getRegion());<a name="line.183"></a>
-<span class="sourceLineNo">184</span>      List&lt;String&gt; locationsList = split.getLocationsList();<a name="line.184"></a>
-<span class="sourceLineNo">185</span>      this.locations = locationsList.toArray(new String[locationsList.size()]);<a name="line.185"></a>
+<span class="sourceLineNo">171</span>      for (String location : locations) {<a name="line.171"></a>
+<span class="sourceLineNo">172</span>        builder.addLocations(location);<a name="line.172"></a>
+<span class="sourceLineNo">173</span>      }<a name="line.173"></a>
+<span class="sourceLineNo">174</span><a name="line.174"></a>
+<span class="sourceLineNo">175</span>      TableSnapshotRegionSplit split = builder.build();<a name="line.175"></a>
+<span class="sourceLineNo">176</span><a name="line.176"></a>
+<span class="sourceLineNo">177</span>      ByteArrayOutputStream baos = new ByteArrayOutputStream();<a name="line.177"></a>
+<span class="sourceLineNo">178</span>      split.writeTo(baos);<a name="line.178"></a>
+<span class="sourceLineNo">179</span>      baos.close();<a name="line.179"></a>
+<span class="sourceLineNo">180</span>      byte[] buf = baos.toByteArray();<a name="line.180"></a>
+<span class="sourceLineNo">181</span>      out.writeInt(buf.length);<a name="line.181"></a>
+<span class="sourceLineNo">182</span>      out.write(buf);<a name="line.182"></a>
+<span class="sourceLineNo">183</span><a name="line.183"></a>
+<span class="sourceLineNo">184</span>      Bytes.writeByteArray(out, Bytes.toBytes(scan));<a name="line.184"></a>
+<span class="sourceLineNo">185</span>      Bytes.writeByteArray(out, Bytes.toBytes(restoreDir));<a name="line.185"></a>
 <span class="sourceLineNo">186</span><a name="line.186"></a>
-<span class="sourceLineNo">187</span>      this.scan = Bytes.toString(Bytes.readByteArray(in));<a name="line.187"></a>
-<span class="sourceLineNo">188</span>      this.restoreDir = Bytes.toString(Bytes.readByteArray(in));<a name="line.188"></a>
-<span class="sourceLineNo">189</span>    }<a name="line.189"></a>
-<span class="sourceLineNo">190</span>  }<a name="line.190"></a>
-<span class="sourceLineNo">191</span><a name="line.191"></a>
-<span class="sourceLineNo">192</span>  /**<a name="line.192"></a>
-<span class="sourceLineNo">193</span>   * Implementation class for RecordReader logic common between mapred and mapreduce.<a name="line.193"></a>
-<span class="sourceLineNo">194</span>   */<a name="line.194"></a>
-<span class="sourceLineNo">195</span>  public static class RecordReader {<a name="line.195"></a>
-<span class="sourceLineNo">196</span>    private InputSplit split;<a name="line.196"></a>
-<span class="sourceLineNo">197</span>    private Scan scan;<a name="line.197"></a>
-<span class="sourceLineNo">198</span>    private Result result = null;<a name="line.198"></a>
-<span class="sourceLineNo">199</span>    private ImmutableBytesWritable row = null;<a name="line.199"></a>
-<span class="sourceLineNo">200</span>    private ClientSideRegionScanner scanner;<a name="line.200"></a>
-<span class="sourceLineNo">201</span><a name="line.201"></a>
-<span class="sourceLineNo">202</span>    public ClientSideRegionScanner getScanner() {<a name="line.202"></a>
-<span class="sourceLineNo">203</span>      return scanner;<a name="line.203"></a>
-<span class="sourceLineNo">204</span>    }<a name="line.204"></a>
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-<span class="sourceLineNo">206</span>    public void initialize(InputSplit split, Configuration conf) throws IOException {<a name="line.206"></a>
-<span class="sourceLineNo">207</span>      this.scan = TableMapReduceUtil.convertStringToScan(split.getScan());<a name="line.207"></a>
-<span class="sourceLineNo">208</span>      this.split = split;<a name="line.208"></a>
-<span class="sourceLineNo">209</span>      TableDescriptor htd = split.htd;<a name="line.209"></a>
-<span class="sourceLineNo">210</span>      HRegionInfo hri = this.split.getRegionInfo();<a name="line.210"></a>
-<span class="sourceLineNo">211</span>      FileSystem fs = FSUtils.getCurrentFileSystem(conf);<a name="line.211"></a>
-<span class="sourceLineNo">212</span><a name="line.212"></a>
-<span class="sourceLineNo">213</span><a name="line.213"></a>
-<span class="sourceLineNo">214</span>      // region is immutable, this should be fine,<a name="line.214"></a>
-<span class="sourceLineNo">215</span>      // otherwise we have to set the thread read point<a name="line.215"></a>
-<span class="sourceLineNo">216</span>      scan.setIsolationLevel(IsolationLevel.READ_UNCOMMITTED);<a name="line.216"></a>
-<span class="sourceLineNo">217</span>      // disable caching of data blocks<a name="line.217"></a>
-<span class="sourceLineNo">218</span>      scan.setCacheBlocks(false);<a name="line.218"></a>
-<span class="sourceLineNo">219</span>      scan.setScanMetricsEnabled(true);<a name="line.219"></a>
-<span class="sourceLineNo">220</span><a name="line.220"></a>
-<span class="sourceLineNo">221</span>      scanner =<a name="line.221"></a>
-<span class="sourceLineNo">222</span>          new ClientSideRegionScanner(conf, fs, new Path(split.restoreDir), htd, hri, scan, null);<a name="line.222"></a>
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-<span class="sourceLineNo">224</span><a name="line.224"></a>
-<span class="sourceLineNo">225</span>    public boolean nextKeyValue() throws IOException {<a name="line.225"></a>
-<span class="sourceLineNo">226</span>      result = scanner.next();<a name="line.226"></a>
-<span class="sourceLineNo">227</span>      if (result == null) {<a name="line.227"></a>
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-<span class="sourceLineNo">453</span>   * @param snapshotName the name of the snapshot to read from<a name="line.453"></a>
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-<span class="sourceLineNo">455</span>   * have write permissions to this directory, and this should not be a subdirectory of rootdir.<a name="line.455"></a>
-<span class="sourceLineNo">456</span>   * After the job is finished, restoreDir can be deleted.<a name="line.456"></a>
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-<span class="sourceLineNo">467</span>   * @param snapshotName the name of the snapshot to read from<a name="line.467"></a>
-<span class="sourceLineNo">468</span>   * @param restoreDir a temporary directory to restore the snapshot into. Current user should<a name="line.468"></a>
-<span class="sourceLineNo">469</span>   * have write permissions to this directory, and this should not be a subdirectory of rootdir.<a name="line.469"></a>
-<span class="sourceLineNo">470</span>   * After the job is finished, restoreDir can be deleted.<a name="line.470"></a>
-<span class="sourceLineNo">471</span>   * @param numSplitsPerRegion how many input splits to generate per one region<a name="line.471"></a>
-<span class="sourceLineNo">472</span>   * @param splitAlgo SplitAlgorithm to be used when generating InputSplits<a name="line.472"></a>
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+<span class="sourceLineNo">447</span>    List&lt;String&gt; locations = new ArrayList&lt;&gt;(top);<a name="line.447"></a>
+<span class="sourceLineNo">448</span>    HostAndWeight topHost = hostAndWeights[0];<a name="line.448"></a>
+<span class="sourceLineNo">449</span>    locations.add(topHost.getHost());<a name="line.449"></a>
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+<span class="sourceLineNo">458</span>            = conf.getFloat(LOCALITY_CUTOFF_MULTIPLIER, DEFAULT_LOCALITY_CUTOFF_MULTIPLIER);<a name="line.458"></a>
+<span class="sourceLineNo">459</span><a name="line.459"></a>
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+<span class="sourceLineNo">466</span>        // As hostAndWeights is in descending order,<a name="line.466"></a>
+<span class="sourceLineNo">467</span>        // we could break the loop as long as we meet a weight which is less than filterWeight.<a name="line.467"></a>
+<span class="sourceLineNo">468</span>        break;<a name="line.468"></a>
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+<span class="sourceLineNo">476</span>      HDFSBlocksDistribution blockDistribution) {<a name="line.476"></a>
+<span class="sourceLineNo">477</span>    // 3 nodes will contain highly local blocks. So default to 3.<a name="line.477"></a>
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+<span class="sourceLineNo">480</span><a name="line.480"></a>
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+<span class="sourceLineNo">484</span>      throw new IllegalArgumentException("Snapshot name must be provided");<a name="line.484"></a>
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+<span class="sourceLineNo">486</span>    return snapshotName;<a name="line.486"></a>
+<span class="sourceLineNo">487</span>  }<a name="line.487"></a>
+<span class="sourceLineNo">488</span><a name="line.488"></a>
+<span class="sourceLineNo">489</span>  /**<a name="line.489"></a>
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+<span class="sourceLineNo">495</span>   * After the job is finished, restoreDir can be deleted.<a name="line.495"></a>
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+<span class="sourceLineNo">497</span>   */<a name="line.497"></a>
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+<span class="sourceLineNo">502</span><a name="line.502"></a>
+<span class="sourceLineNo">503</span>  /**<a name="line.503"></a>
+<span class="sourceLineNo">504</span>   * Configures the job to use TableSnapshotInputFormat to read from a snapshot.<a name="line.504"></a>
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+<span class="sourceLineNo">506</span>   * @param snapshotName the name of the snapshot to read from<a name="line.506"></a>
+<span class="sourceLineNo">507</span>   * @param restoreDir a temporary directory to restore the snapshot into. Current user should<a name="line.507"></a>
+<span class="sourceLineNo">508</span>   * have write permissions to this directory, and this should not be a subdirectory of rootdir.<a name="line.508"></a>
+<span class="sourceLineNo">509</span>   * After the job is finished, restoreDir can be deleted.<a name="line.509"></a>
+<span class="sourceLineNo">510</span>   * @param numSplitsPerRegion how many input splits to generate per one region<a name="line.510"></a>
+<span class="sourceLineNo">511</span>   * @param splitAlgo SplitAlgorithm to be used when generating InputSplits<a name="line.511"></a>
+<span class="sourceLineNo">512</span>   * @throws IOException if an error occurs<a name="line.512"></a>
+<span class="sourceLineNo">513</span>   */<a name="line.513"></a>
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+<span class="sourceLineNo">516</span>          throws IOException {<a name="line.516"></a>
+<span class="sourceLineNo">517</span>    conf.set(SNAPSHOT_NAME_KEY, snapshotName);<a name="line.517"></a>
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+<span class="sourceLineNo">519</span>      throw new IllegalArgumentException("numSplits must be &gt;= 1, " +<a name="line.519"></a>
+<span class="sourceLineNo">520</span>              "illegal numSplits : " + numSplitsPerRegion);<a name="line.520"></a>
+<span class="sourceLineNo">521</span>    }<a name="line.521"></a>
+<span class="sourceLineNo">522</span>    if (splitAlgo == null &amp;&amp; numSplitsPerRegion &gt; 1) {<a name="line.522"></a>
+<span class="sourceLineNo">523</span>      throw new IllegalArgumentException("Split algo can't be null when numSplits &gt; 1");<a name="line.523"></a>
+<span class="sourceLineNo">524</span>    }<a name="line.524"></a>
+<span class="sourceLineNo">525</span>    if (splitAlgo != null) {<a name="line.525"></a>
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+<span class="sourceLineNo">527</span>    }<a name="line.527"></a>
+<span class="sourceLineNo">528</span>    conf.setInt(NUM_SPLITS_PER_REGION, numSplitsPerRegion);<a name="line.528"></a>
+<span class="sourceLineNo">529</span>    Path rootDir = FSUtils.getRootDir(conf);<a name="line.529"></a>
+<span class="sourceLineNo">530</span>    FileSystem fs = rootDir.getFileSystem(conf);<a name="line.530"></a>
+<span class="sourceLineNo">531</span><a name="line.531"></a>
+<span class="sourceLineNo">532</span>    restoreDir = new Path(restoreDir, UUID.randomUUID().toString());<a name="line.532"></a>
+<span class="sourceLineNo">533</span><a name="line.533"></a>
+<span class="sourceLineNo">534</span>    // TODO: restore from record readers to parallelize.<a name="line.534"></a>
+<span class="sourceLineNo">535</span>    RestoreSnapshotHelper.copySnapshotForScanner(conf, fs, rootDir, restoreDir, snapshotName);<a name="line.535"></a>
+<span class="sourceLineNo">536</span><a name="line.536"></a>
+<span class="sourceLineNo">537</span>    conf.set(RESTORE_DIR_KEY, restoreDir.toString());<a name="line.537"></a>
+<span class="sourceLineNo">538</span>  }<a name="line.538"></a>
+<span class="sourceLineNo">539</span>}<a name="line.539"></a>
 
 
 


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