http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f8d69509/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogReader.WALHdrResult.html
----------------------------------------------------------------------
diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogReader.WALHdrResult.html
b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogReader.WALHdrResult.html
index 98a2d4e..38d4804 100644
---
a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogReader.WALHdrResult.html
+++
b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogReader.WALHdrResult.html
@@ -99,328 +99,329 @@
<span class="sourceLineNo">091</span> private static List<String>
writerClsNames = new ArrayList<String>();<a name="line.91"></a>
<span class="sourceLineNo">092</span> static {<a name="line.92"></a>
<span class="sourceLineNo">093</span>
writerClsNames.add(ProtobufLogWriter.class.getSimpleName());<a
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at EOF when method starts<a name="line.100"></a>
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-<span class="sourceLineNo">104</span> <a name="line.104"></a>
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String cellCodecClsName) {<a name="line.110"></a>
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cellCodecClsName;<a name="line.112"></a>
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name="line.176"></a>
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name="line.187"></a>
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readHeader(builder, stream);<a name="line.199"></a>
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hdrCtxt.getResult();<a name="line.200"></a>
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{<a name="line.201"></a>
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name="line.229"></a>
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trailer is present at the end or not by comparing the last<a
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name="line.318"></a>
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name="line.320"></a>
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this.inputStream.read();<a name="line.322"></a>
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name="line.323"></a>
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name="line.326"></a>
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name="line.332"></a>
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name="line.335"></a>
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EOFException("Invalid PB, EOF? Ignoring; originalPosition=" +<a
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currentPosition=" + this.inputStream.getPos() +<a name="line.338"></a>
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currentAvailable=" + available).initCause(ipbe);<a name="line.339"></a>
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name="line.341"></a>
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try to recover from corrupt PB that looks semi-legit.<a name="line.342"></a>
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count, we could, theoretically, try to get next record.<a name="line.343"></a>
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entry.getKey().readFieldsFromPb(walKey, this.byteStringUncompressor);<a
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|| 0 == walKey.getFollowingKvCount()) {<a name="line.349"></a>
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name="line.364"></a>
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for error message - ignoring", t);<a name="line.365"></a>
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reading " + expectedCells + " WAL KVs; started reading at "<a
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to " + posAfterStr;<a name="line.368"></a>
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this.inputStream.getPos() > this.walEditsStopOffset) {<a name="line.373"></a>
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while reading WALEdits. wal: " + this.path<a name="line.374"></a>
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this.walEditsStopOffset);<a name="line.376"></a>
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WALTrailer while reading WALEdits");<a name="line.377"></a>
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malformed edit, seeking back to last good position in file", eof);<a
name="line.380"></a>
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it is rubbish and we cannot use it (probably local fs)<a name="line.381"></a>
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throw eof;<a name="line.382"></a>
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dealing with here. Hadoop stream throws generic exception<a name="line.393"></a>
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scanner further hides it inside RuntimeException.<a name="line.394"></a>
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name="line.395"></a>
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name="line.396"></a>
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{<a name="line.398"></a>
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name="line.399"></a>
-<span class="sourceLineNo">400</span> } else if (ex instanceof
RuntimeException<a name="line.400"></a>
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&& ex.getCause() instanceof IOException) {<a name="line.401"></a>
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(IOException)ex.getCause();<a name="line.402"></a>
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-<span class="sourceLineNo">404</span> if (ioEx != null) {<a
name="line.404"></a>
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(ioEx.getMessage().contains("EOF")) return ioEx;<a name="line.405"></a>
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name="line.413"></a>
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+<span class="sourceLineNo">094</span>
writerClsNames.add(AsyncProtobufLogWriter.class.getSimpleName());<a
name="line.94"></a>
+<span class="sourceLineNo">095</span> }<a name="line.95"></a>
+<span class="sourceLineNo">096</span> <a name="line.96"></a>
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name="line.97"></a>
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name="line.98"></a>
+<span class="sourceLineNo">099</span><a name="line.99"></a>
+<span class="sourceLineNo">100</span> enum WALHdrResult {<a
name="line.100"></a>
+<span class="sourceLineNo">101</span> EOF, // stream is
at EOF when method starts<a name="line.101"></a>
+<span class="sourceLineNo">102</span> SUCCESS,<a name="line.102"></a>
+<span class="sourceLineNo">103</span> UNKNOWN_WRITER_CLS // name of
writer class isn't recognized<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> // context for WALHdr carrying
information such as Cell Codec classname<a name="line.106"></a>
+<span class="sourceLineNo">107</span> static class WALHdrContext {<a
name="line.107"></a>
+<span class="sourceLineNo">108</span> WALHdrResult result;<a
name="line.108"></a>
+<span class="sourceLineNo">109</span> String cellCodecClsName;<a
name="line.109"></a>
+<span class="sourceLineNo">110</span> <a name="line.110"></a>
+<span class="sourceLineNo">111</span> WALHdrContext(WALHdrResult result,
String cellCodecClsName) {<a name="line.111"></a>
+<span class="sourceLineNo">112</span> this.result = result;<a
name="line.112"></a>
+<span class="sourceLineNo">113</span> this.cellCodecClsName =
cellCodecClsName;<a name="line.113"></a>
+<span class="sourceLineNo">114</span> }<a name="line.114"></a>
+<span class="sourceLineNo">115</span> WALHdrResult getResult() {<a
name="line.115"></a>
+<span class="sourceLineNo">116</span> return result;<a
name="line.116"></a>
+<span class="sourceLineNo">117</span> }<a name="line.117"></a>
+<span class="sourceLineNo">118</span> String getCellCodecClsName() {<a
name="line.118"></a>
+<span class="sourceLineNo">119</span> return cellCodecClsName;<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><a name="line.122"></a>
+<span class="sourceLineNo">123</span> public ProtobufLogReader() {<a
name="line.123"></a>
+<span class="sourceLineNo">124</span> super();<a name="line.124"></a>
+<span class="sourceLineNo">125</span> }<a name="line.125"></a>
+<span class="sourceLineNo">126</span><a name="line.126"></a>
+<span class="sourceLineNo">127</span> @Override<a name="line.127"></a>
+<span class="sourceLineNo">128</span> public void close() throws IOException
{<a name="line.128"></a>
+<span class="sourceLineNo">129</span> if (this.inputStream != null) {<a
name="line.129"></a>
+<span class="sourceLineNo">130</span> this.inputStream.close();<a
name="line.130"></a>
+<span class="sourceLineNo">131</span> this.inputStream = null;<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><a name="line.134"></a>
+<span class="sourceLineNo">135</span> @Override<a name="line.135"></a>
+<span class="sourceLineNo">136</span> public long getPosition() throws
IOException {<a name="line.136"></a>
+<span class="sourceLineNo">137</span> return inputStream.getPos();<a
name="line.137"></a>
+<span class="sourceLineNo">138</span> }<a name="line.138"></a>
+<span class="sourceLineNo">139</span><a name="line.139"></a>
+<span class="sourceLineNo">140</span> @Override<a name="line.140"></a>
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{<a name="line.141"></a>
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false);<a name="line.142"></a>
+<span class="sourceLineNo">143</span> initAfterCompression(clsName); // We
need a new decoder (at least).<a name="line.143"></a>
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+<span class="sourceLineNo">145</span><a name="line.145"></a>
+<span class="sourceLineNo">146</span> @Override<a name="line.146"></a>
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path, Configuration conf, FSDataInputStream stream)<a name="line.147"></a>
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name="line.148"></a>
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conf.getInt(WAL_TRAILER_WARN_SIZE, DEFAULT_WAL_TRAILER_WARN_SIZE);<a
name="line.149"></a>
+<span class="sourceLineNo">150</span> super.init(fs, path, conf, stream);<a
name="line.150"></a>
+<span class="sourceLineNo">151</span> }<a name="line.151"></a>
+<span class="sourceLineNo">152</span><a name="line.152"></a>
+<span class="sourceLineNo">153</span> @Override<a name="line.153"></a>
+<span class="sourceLineNo">154</span> protected String
initReader(FSDataInputStream stream) throws IOException {<a name="line.154"></a>
+<span class="sourceLineNo">155</span> return initInternal(stream, true);<a
name="line.155"></a>
+<span class="sourceLineNo">156</span> }<a name="line.156"></a>
+<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> * Returns names of the accepted writer
classes<a name="line.159"></a>
+<span class="sourceLineNo">160</span> */<a name="line.160"></a>
+<span class="sourceLineNo">161</span> public List<String>
getWriterClsNames() {<a name="line.161"></a>
+<span class="sourceLineNo">162</span> return writerClsNames;<a
name="line.162"></a>
+<span class="sourceLineNo">163</span> }<a name="line.163"></a>
+<span class="sourceLineNo">164</span> <a name="line.164"></a>
+<span class="sourceLineNo">165</span> /*<a name="line.165"></a>
+<span class="sourceLineNo">166</span> * Returns the cell codec classname<a
name="line.166"></a>
+<span class="sourceLineNo">167</span> */<a name="line.167"></a>
+<span class="sourceLineNo">168</span> public String getCodecClsName() {<a
name="line.168"></a>
+<span class="sourceLineNo">169</span> return codecClsName;<a
name="line.169"></a>
+<span class="sourceLineNo">170</span> }<a name="line.170"></a>
+<span class="sourceLineNo">171</span><a name="line.171"></a>
+<span class="sourceLineNo">172</span> protected WALHdrContext
readHeader(Builder builder, FSDataInputStream stream)<a name="line.172"></a>
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name="line.173"></a>
+<span class="sourceLineNo">174</span> boolean res =
builder.mergeDelimitedFrom(stream);<a name="line.174"></a>
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WALHdrContext(WALHdrResult.EOF, null);<a name="line.175"></a>
+<span class="sourceLineNo">176</span> if (builder.hasWriterClsName()
&&<a name="line.176"></a>
+<span class="sourceLineNo">177</span>
!getWriterClsNames().contains(builder.getWriterClsName())) {<a
name="line.177"></a>
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WALHdrContext(WALHdrResult.UNKNOWN_WRITER_CLS, null);<a name="line.178"></a>
+<span class="sourceLineNo">179</span> }<a name="line.179"></a>
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name="line.180"></a>
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{<a name="line.181"></a>
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builder.getCellCodecClsName();<a name="line.182"></a>
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WALHdrContext(WALHdrResult.SUCCESS, clsName);<a name="line.184"></a>
+<span class="sourceLineNo">185</span> }<a name="line.185"></a>
+<span class="sourceLineNo">186</span><a name="line.186"></a>
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initInternal(FSDataInputStream stream, boolean isFirst)<a name="line.187"></a>
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name="line.188"></a>
+<span class="sourceLineNo">189</span> close();<a name="line.189"></a>
+<span class="sourceLineNo">190</span> long expectedPos =
PB_WAL_MAGIC.length;<a name="line.190"></a>
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name="line.191"></a>
+<span class="sourceLineNo">192</span> stream = fs.open(path);<a
name="line.192"></a>
+<span class="sourceLineNo">193</span> stream.seek(expectedPos);<a
name="line.193"></a>
+<span class="sourceLineNo">194</span> }<a name="line.194"></a>
+<span class="sourceLineNo">195</span> if (stream.getPos() != expectedPos)
{<a name="line.195"></a>
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is at invalid position: " + stream.getPos());<a name="line.196"></a>
+<span class="sourceLineNo">197</span> }<a name="line.197"></a>
+<span class="sourceLineNo">198</span> // Initialize metadata or, when we
reset, just skip the header.<a name="line.198"></a>
+<span class="sourceLineNo">199</span> WALProtos.WALHeader.Builder builder =
WALProtos.WALHeader.newBuilder();<a name="line.199"></a>
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readHeader(builder, stream);<a name="line.200"></a>
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hdrCtxt.getResult();<a name="line.201"></a>
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{<a name="line.202"></a>
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read WAL PB header");<a name="line.203"></a>
+<span class="sourceLineNo">204</span> }<a name="line.204"></a>
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WALHdrResult.UNKNOWN_WRITER_CLS) {<a name="line.205"></a>
+<span class="sourceLineNo">206</span> throw new IOException("Got unknown
writer class: " + builder.getWriterClsName());<a name="line.206"></a>
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+<span class="sourceLineNo">208</span> if (isFirst) {<a name="line.208"></a>
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builder.build();<a name="line.209"></a>
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header.hasHasCompression() && header.getHasCompression();<a
name="line.210"></a>
+<span class="sourceLineNo">211</span> this.hasTagCompression =
header.hasHasTagCompression() && header.getHasTagCompression();<a
name="line.211"></a>
+<span class="sourceLineNo">212</span> }<a name="line.212"></a>
+<span class="sourceLineNo">213</span> this.inputStream = stream;<a
name="line.213"></a>
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this.fileLength;<a name="line.214"></a>
+<span class="sourceLineNo">215</span> long currentPosition =
stream.getPos();<a name="line.215"></a>
+<span class="sourceLineNo">216</span> trailerPresent =
setTrailerIfPresent();<a name="line.216"></a>
+<span class="sourceLineNo">217</span> this.seekOnFs(currentPosition);<a
name="line.217"></a>
+<span class="sourceLineNo">218</span> if (LOG.isTraceEnabled()) {<a
name="line.218"></a>
+<span class="sourceLineNo">219</span> LOG.trace("After reading the
trailer: walEditsStopOffset: " + this.walEditsStopOffset<a name="line.219"></a>
+<span class="sourceLineNo">220</span> + ", fileLength: " +
this.fileLength + ", " + "trailerPresent: " + trailerPresent);<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> codecClsName =
hdrCtxt.getCellCodecClsName();<a name="line.223"></a>
+<span class="sourceLineNo">224</span> <a name="line.224"></a>
+<span class="sourceLineNo">225</span> return
hdrCtxt.getCellCodecClsName();<a name="line.225"></a>
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+<span class="sourceLineNo">227</span><a name="line.227"></a>
+<span class="sourceLineNo">228</span> /**<a name="line.228"></a>
+<span class="sourceLineNo">229</span> * To check whether a trailer is
present in a WAL, it seeks to position (fileLength -<a name="line.229"></a>
+<span class="sourceLineNo">230</span> * PB_WAL_COMPLETE_MAGIC.size() -
Bytes.SIZEOF_INT). It reads the int value to know the size of<a
name="line.230"></a>
+<span class="sourceLineNo">231</span> * the trailer, and checks whether the
trailer is present at the end or not by comparing the last<a
name="line.231"></a>
+<span class="sourceLineNo">232</span> * PB_WAL_COMPLETE_MAGIC.size() bytes.
In case trailer is not present, it returns false;<a name="line.232"></a>
+<span class="sourceLineNo">233</span> * otherwise, sets the trailer and sets
this.walEditsStopOffset variable up to the point just<a name="line.233"></a>
+<span class="sourceLineNo">234</span> * before the trailer.<a
name="line.234"></a>
+<span class="sourceLineNo">235</span> * <ul><a name="line.235"></a>
+<span class="sourceLineNo">236</span> * The trailer is ignored in case:<a
name="line.236"></a>
+<span class="sourceLineNo">237</span> * <li>fileLength is 0 or not
correct (when file is under recovery, etc).<a name="line.237"></a>
+<span class="sourceLineNo">238</span> * <li>the trailer size is
negative.<a name="line.238"></a>
+<span class="sourceLineNo">239</span> * </ul><a name="line.239"></a>
+<span class="sourceLineNo">240</span> * <p><a name="line.240"></a>
+<span class="sourceLineNo">241</span> * In case the trailer size >
this.trailerMaxSize, it is read after a WARN message.<a name="line.241"></a>
+<span class="sourceLineNo">242</span> * @return true if a valid trailer is
present<a name="line.242"></a>
+<span class="sourceLineNo">243</span> * @throws IOException<a
name="line.243"></a>
+<span class="sourceLineNo">244</span> */<a name="line.244"></a>
+<span class="sourceLineNo">245</span> private boolean setTrailerIfPresent()
{<a name="line.245"></a>
+<span class="sourceLineNo">246</span> try {<a name="line.246"></a>
+<span class="sourceLineNo">247</span> long trailerSizeOffset =
this.fileLength - (PB_WAL_COMPLETE_MAGIC.length + Bytes.SIZEOF_INT);<a
name="line.247"></a>
+<span class="sourceLineNo">248</span> if (trailerSizeOffset <= 0)
return false;// no trailer possible.<a name="line.248"></a>
+<span class="sourceLineNo">249</span> this.seekOnFs(trailerSizeOffset);<a
name="line.249"></a>
+<span class="sourceLineNo">250</span> // read the int as trailer size.<a
name="line.250"></a>
+<span class="sourceLineNo">251</span> int trailerSize =
this.inputStream.readInt();<a name="line.251"></a>
+<span class="sourceLineNo">252</span> ByteBuffer buf =
ByteBuffer.allocate(ProtobufLogReader.PB_WAL_COMPLETE_MAGIC.length);<a
name="line.252"></a>
+<span class="sourceLineNo">253</span>
this.inputStream.readFully(buf.array(), buf.arrayOffset(), buf.capacity());<a
name="line.253"></a>
+<span class="sourceLineNo">254</span> if (!Arrays.equals(buf.array(),
PB_WAL_COMPLETE_MAGIC)) {<a name="line.254"></a>
+<span class="sourceLineNo">255</span> LOG.trace("No trailer found.");<a
name="line.255"></a>
+<span class="sourceLineNo">256</span> return false;<a
name="line.256"></a>
+<span class="sourceLineNo">257</span> }<a name="line.257"></a>
+<span class="sourceLineNo">258</span> if (trailerSize < 0) {<a
name="line.258"></a>
+<span class="sourceLineNo">259</span> LOG.warn("Invalid trailer Size "
+ trailerSize + ", ignoring the trailer");<a name="line.259"></a>
+<span class="sourceLineNo">260</span> return false;<a
name="line.260"></a>
+<span class="sourceLineNo">261</span> } else if (trailerSize >
this.trailerWarnSize) {<a name="line.261"></a>
+<span class="sourceLineNo">262</span> // continue reading after warning
the user.<a name="line.262"></a>
+<span class="sourceLineNo">263</span> LOG.warn("Please investigate
WALTrailer usage. Trailer size > maximum configured size : "<a
name="line.263"></a>
+<span class="sourceLineNo">264</span> + trailerSize + " > " +
this.trailerWarnSize);<a name="line.264"></a>
+<span class="sourceLineNo">265</span> }<a name="line.265"></a>
+<span class="sourceLineNo">266</span> // seek to the position where
trailer starts.<a name="line.266"></a>
+<span class="sourceLineNo">267</span> long positionOfTrailer =
trailerSizeOffset - trailerSize;<a name="line.267"></a>
+<span class="sourceLineNo">268</span> this.seekOnFs(positionOfTrailer);<a
name="line.268"></a>
+<span class="sourceLineNo">269</span> // read the trailer.<a
name="line.269"></a>
+<span class="sourceLineNo">270</span> buf =
ByteBuffer.allocate(trailerSize);// for trailer.<a name="line.270"></a>
+<span class="sourceLineNo">271</span>
this.inputStream.readFully(buf.array(), buf.arrayOffset(), buf.capacity());<a
name="line.271"></a>
+<span class="sourceLineNo">272</span> trailer =
WALTrailer.parseFrom(buf.array());<a name="line.272"></a>
+<span class="sourceLineNo">273</span> this.walEditsStopOffset =
positionOfTrailer;<a name="line.273"></a>
+<span class="sourceLineNo">274</span> return true;<a name="line.274"></a>
+<span class="sourceLineNo">275</span> } catch (IOException ioe) {<a
name="line.275"></a>
+<span class="sourceLineNo">276</span> LOG.warn("Got IOE while reading the
trailer. Continuing as if no trailer is present.", ioe);<a name="line.276"></a>
+<span class="sourceLineNo">277</span> }<a name="line.277"></a>
+<span class="sourceLineNo">278</span> return false;<a name="line.278"></a>
+<span class="sourceLineNo">279</span> }<a name="line.279"></a>
+<span class="sourceLineNo">280</span><a name="line.280"></a>
+<span class="sourceLineNo">281</span> protected WALCellCodec
getCodec(Configuration conf, String cellCodecClsName,<a name="line.281"></a>
+<span class="sourceLineNo">282</span> CompressionContext
compressionContext) throws IOException {<a name="line.282"></a>
+<span class="sourceLineNo">283</span> return WALCellCodec.create(conf,
cellCodecClsName, compressionContext);<a name="line.283"></a>
+<span class="sourceLineNo">284</span> }<a name="line.284"></a>
+<span class="sourceLineNo">285</span><a name="line.285"></a>
+<span class="sourceLineNo">286</span> @Override<a name="line.286"></a>
+<span class="sourceLineNo">287</span> protected void initAfterCompression()
throws IOException {<a name="line.287"></a>
+<span class="sourceLineNo">288</span> initAfterCompression(null);<a
name="line.288"></a>
+<span class="sourceLineNo">289</span> }<a name="line.289"></a>
+<span class="sourceLineNo">290</span> <a name="line.290"></a>
+<span class="sourceLineNo">291</span> @Override<a name="line.291"></a>
+<span class="sourceLineNo">292</span> protected void
initAfterCompression(String cellCodecClsName) throws IOException {<a
name="line.292"></a>
+<span class="sourceLineNo">293</span> WALCellCodec codec =
getCodec(this.conf, cellCodecClsName, this.compressionContext);<a
name="line.293"></a>
+<span class="sourceLineNo">294</span> this.cellDecoder =
codec.getDecoder(this.inputStream);<a name="line.294"></a>
+<span class="sourceLineNo">295</span> if (this.hasCompression) {<a
name="line.295"></a>
+<span class="sourceLineNo">296</span> this.byteStringUncompressor =
codec.getByteStringUncompressor();<a name="line.296"></a>
+<span class="sourceLineNo">297</span> }<a name="line.297"></a>
+<span class="sourceLineNo">298</span> }<a name="line.298"></a>
+<span class="sourceLineNo">299</span><a name="line.299"></a>
+<span class="sourceLineNo">300</span> @Override<a name="line.300"></a>
+<span class="sourceLineNo">301</span> protected boolean hasCompression() {<a
name="line.301"></a>
+<span class="sourceLineNo">302</span> return this.hasCompression;<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> @Override<a name="line.305"></a>
+<span class="sourceLineNo">306</span> protected boolean hasTagCompression()
{<a name="line.306"></a>
+<span class="sourceLineNo">307</span> return this.hasTagCompression;<a
name="line.307"></a>
+<span class="sourceLineNo">308</span> }<a name="line.308"></a>
+<span class="sourceLineNo">309</span><a name="line.309"></a>
+<span class="sourceLineNo">310</span> @Override<a name="line.310"></a>
+<span class="sourceLineNo">311</span> protected boolean readNext(Entry entry)
throws IOException {<a name="line.311"></a>
+<span class="sourceLineNo">312</span> while (true) {<a name="line.312"></a>
+<span class="sourceLineNo">313</span> // OriginalPosition might be < 0
on local fs; if so, it is useless to us.<a name="line.313"></a>
+<span class="sourceLineNo">314</span> long originalPosition =
this.inputStream.getPos();<a name="line.314"></a>
+<span class="sourceLineNo">315</span> if (trailerPresent &&
originalPosition > 0 && originalPosition == this.walEditsStopOffset)
{<a name="line.315"></a>
+<span class="sourceLineNo">316</span> return false;<a
name="line.316"></a>
+<span class="sourceLineNo">317</span> }<a name="line.317"></a>
+<span class="sourceLineNo">318</span> WALKey.Builder builder =
WALKey.newBuilder();<a name="line.318"></a>
+<span class="sourceLineNo">319</span> long size = 0;<a
name="line.319"></a>
+<span class="sourceLineNo">320</span> try {<a name="line.320"></a>
+<span class="sourceLineNo">321</span> long available = -1;<a
name="line.321"></a>
+<span class="sourceLineNo">322</span> try {<a name="line.322"></a>
+<span class="sourceLineNo">323</span> int firstByte =
this.inputStream.read();<a name="line.323"></a>
+<span class="sourceLineNo">324</span> if (firstByte == -1) {<a
name="line.324"></a>
+<span class="sourceLineNo">325</span> throw new EOFException("First
byte is negative");<a name="line.325"></a>
+<span class="sourceLineNo">326</span> }<a name="line.326"></a>
+<span class="sourceLineNo">327</span> size =
CodedInputStream.readRawVarint32(firstByte, this.inputStream);<a
name="line.327"></a>
+<span class="sourceLineNo">328</span> // available may be < 0 on
local fs for instance. If so, can't depend on it.<a name="line.328"></a>
+<span class="sourceLineNo">329</span> available =
this.inputStream.available();<a name="line.329"></a>
+<span class="sourceLineNo">330</span> if (available > 0 &&
available < size) {<a name="line.330"></a>
+<span class="sourceLineNo">331</span> throw new
EOFException("Available stream not enough for edit, " +<a name="line.331"></a>
+<span class="sourceLineNo">332</span> "inputStream.available()=
" + this.inputStream.available() + ", " +<a name="line.332"></a>
+<span class="sourceLineNo">333</span> "entry size= " + size);<a
name="line.333"></a>
+<span class="sourceLineNo">334</span> }<a name="line.334"></a>
+<span class="sourceLineNo">335</span> ProtobufUtil.mergeFrom(builder,
new LimitInputStream(this.inputStream, size),<a name="line.335"></a>
+<span class="sourceLineNo">336</span> (int)size);<a
name="line.336"></a>
+<span class="sourceLineNo">337</span> } catch
(InvalidProtocolBufferException ipbe) {<a name="line.337"></a>
+<span class="sourceLineNo">338</span> throw (EOFException) new
EOFException("Invalid PB, EOF? Ignoring; originalPosition=" +<a
name="line.338"></a>
+<span class="sourceLineNo">339</span> originalPosition + ",
currentPosition=" + this.inputStream.getPos() +<a name="line.339"></a>
+<span class="sourceLineNo">340</span> ", messageSize=" + size + ",
currentAvailable=" + available).initCause(ipbe);<a name="line.340"></a>
+<span class="sourceLineNo">341</span> }<a name="line.341"></a>
+<span class="sourceLineNo">342</span> if (!builder.isInitialized()) {<a
name="line.342"></a>
+<span class="sourceLineNo">343</span> // TODO: not clear if we should
try to recover from corrupt PB that looks semi-legit.<a name="line.343"></a>
+<span class="sourceLineNo">344</span> // If we can get the KV
count, we could, theoretically, try to get next record.<a name="line.344"></a>
+<span class="sourceLineNo">345</span> throw new EOFException("Partial
PB while reading WAL, " +<a name="line.345"></a>
+<span class="sourceLineNo">346</span> "probably an unexpected
EOF, ignoring");<a name="line.346"></a>
+<span class="sourceLineNo">347</span> }<a name="line.347"></a>
+<span class="sourceLineNo">348</span> WALKey walKey =
builder.build();<a name="line.348"></a>
+<span class="sourceLineNo">349</span>
entry.getKey().readFieldsFromPb(walKey, this.byteStringUncompressor);<a
name="line.349"></a>
+<span class="sourceLineNo">350</span> if (!walKey.hasFollowingKvCount()
|| 0 == walKey.getFollowingKvCount()) {<a name="line.350"></a>
+<span class="sourceLineNo">351</span> LOG.trace("WALKey has no KVs
that follow it; trying the next one");<a name="line.351"></a>
+<span class="sourceLineNo">352</span> continue;<a name="line.352"></a>
+<span class="sourceLineNo">353</span> }<a name="line.353"></a>
+<span class="sourceLineNo">354</span> int expectedCells =
walKey.getFollowingKvCount();<a name="line.354"></a>
+<span class="sourceLineNo">355</span> long posBefore =
this.inputStream.getPos();<a name="line.355"></a>
+<span class="sourceLineNo">356</span> try {<a name="line.356"></a>
+<span class="sourceLineNo">357</span> int actualCells =
entry.getEdit().readFromCells(cellDecoder, expectedCells);<a
name="line.357"></a>
+<span class="sourceLineNo">358</span> if (expectedCells !=
actualCells) {<a name="line.358"></a>
+<span class="sourceLineNo">359</span> throw new EOFException("Only
read " + actualCells); // other info added in catch<a name="line.359"></a>
+<span class="sourceLineNo">360</span> }<a name="line.360"></a>
+<span class="sourceLineNo">361</span> } catch (Exception ex) {<a
name="line.361"></a>
+<span class="sourceLineNo">362</span> String posAfterStr =
"<unknown>";<a name="line.362"></a>
+<span class="sourceLineNo">363</span> try {<a name="line.363"></a>
+<span class="sourceLineNo">364</span> posAfterStr =
this.inputStream.getPos() + "";<a name="line.364"></a>
+<span class="sourceLineNo">365</span> } catch (Throwable t) {<a
name="line.365"></a>
+<span class="sourceLineNo">366</span> LOG.trace("Error getting pos
for error message - ignoring", t);<a name="line.366"></a>
+<span class="sourceLineNo">367</span> }<a name="line.367"></a>
+<span class="sourceLineNo">368</span> String message = " while
reading " + expectedCells + " WAL KVs; started reading at "<a
name="line.368"></a>
+<span class="sourceLineNo">369</span> + posBefore + " and read up
to " + posAfterStr;<a name="line.369"></a>
+<span class="sourceLineNo">370</span> IOException realEofEx =
extractHiddenEof(ex);<a name="line.370"></a>
+<span class="sourceLineNo">371</span> throw (EOFException) new
EOFException("EOF " + message).<a name="line.371"></a>
+<span class="sourceLineNo">372</span> initCause(realEofEx != null
? realEofEx : ex);<a name="line.372"></a>
+<span class="sourceLineNo">373</span> }<a name="line.373"></a>
+<span class="sourceLineNo">374</span> if (trailerPresent &&
this.inputStream.getPos() > this.walEditsStopOffset) {<a name="line.374"></a>
+<span class="sourceLineNo">375</span> LOG.error("Read WALTrailer
while reading WALEdits. wal: " + this.path<a name="line.375"></a>
+<span class="sourceLineNo">376</span> + ", inputStream.getPos():
" + this.inputStream.getPos() + ", walEditsStopOffset: "<a name="line.376"></a>
+<span class="sourceLineNo">377</span> +
this.walEditsStopOffset);<a name="line.377"></a>
+<span class="sourceLineNo">378</span> throw new EOFException("Read
WALTrailer while reading WALEdits");<a name="line.378"></a>
+<span class="sourceLineNo">379</span> }<a name="line.379"></a>
+<span class="sourceLineNo">380</span> } catch (EOFException eof) {<a
name="line.380"></a>
+<span class="sourceLineNo">381</span> LOG.trace("Encountered a
malformed edit, seeking back to last good position in file", eof);<a
name="line.381"></a>
+<span class="sourceLineNo">382</span> // If originalPosition is < 0,
it is rubbish and we cannot use it (probably local fs)<a name="line.382"></a>
+<span class="sourceLineNo">383</span> if (originalPosition < 0)
throw eof;<a name="line.383"></a>
+<span class="sourceLineNo">384</span> // Else restore our position to
original location in hope that next time through we will<a name="line.384"></a>
+<span class="sourceLineNo">385</span> // read successfully.<a
name="line.385"></a>
+<span class="sourceLineNo">386</span> seekOnFs(originalPosition);<a
name="line.386"></a>
+<span class="sourceLineNo">387</span> return false;<a
name="line.387"></a>
+<span class="sourceLineNo">388</span> }<a name="line.388"></a>
+<span class="sourceLineNo">389</span> return true;<a name="line.389"></a>
+<span class="sourceLineNo">390</span> }<a name="line.390"></a>
+<span class="sourceLineNo">391</span> }<a name="line.391"></a>
+<span class="sourceLineNo">392</span><a name="line.392"></a>
+<span class="sourceLineNo">393</span> private IOException
extractHiddenEof(Exception ex) {<a name="line.393"></a>
+<span class="sourceLineNo">394</span> // There are two problems we are
dealing with here. Hadoop stream throws generic exception<a name="line.394"></a>
+<span class="sourceLineNo">395</span> // for EOF, not EOFException; and
scanner further hides it inside RuntimeException.<a name="line.395"></a>
+<span class="sourceLineNo">396</span> IOException ioEx = null;<a
name="line.396"></a>
+<span class="sourceLineNo">397</span> if (ex instanceof EOFException) {<a
name="line.397"></a>
+<span class="sourceLineNo">398</span> return (EOFException)ex;<a
name="line.398"></a>
+<span class="sourceLineNo">399</span> } else if (ex instanceof IOException)
{<a name="line.399"></a>
+<span class="sourceLineNo">400</span> ioEx = (IOException)ex;<a
name="line.400"></a>
+<span class="sourceLineNo">401</span> } else if (ex instanceof
RuntimeException<a name="line.401"></a>
+<span class="sourceLineNo">402</span> && ex.getCause() != null
&& ex.getCause() instanceof IOException) {<a name="line.402"></a>
+<span class="sourceLineNo">403</span> ioEx =
(IOException)ex.getCause();<a name="line.403"></a>
+<span class="sourceLineNo">404</span> }<a name="line.404"></a>
+<span class="sourceLineNo">405</span> if (ioEx != null) {<a
name="line.405"></a>
+<span class="sourceLineNo">406</span> if
(ioEx.getMessage().contains("EOF")) return ioEx;<a name="line.406"></a>
+<span class="sourceLineNo">407</span> return null;<a name="line.407"></a>
+<span class="sourceLineNo">408</span> }<a name="line.408"></a>
+<span class="sourceLineNo">409</span> return null;<a name="line.409"></a>
+<span class="sourceLineNo">410</span> }<a name="line.410"></a>
+<span class="sourceLineNo">411</span><a name="line.411"></a>
+<span class="sourceLineNo">412</span> @Override<a name="line.412"></a>
+<span class="sourceLineNo">413</span> protected void seekOnFs(long pos)
throws IOException {<a name="line.413"></a>
+<span class="sourceLineNo">414</span> this.inputStream.seek(pos);<a
name="line.414"></a>
+<span class="sourceLineNo">415</span> }<a name="line.415"></a>
+<span class="sourceLineNo">416</span>}<a name="line.416"></a>
