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HBASE-2889 Tool to look at HLogs -- parse and tail -f; fix for suppression of EOFEs by Nicolas 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1000697 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2010-09-24 04:00:48 +00:00
parent 0f3c62e19b
commit a85ee11f3b
1 changed files with 29 additions and 11 deletions
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36
src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogReader.java
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@ -22,6 +22,9 @@ package org.apache.hadoop.hbase.regionserver.wal;
import java.io.EOFException; import java.io.EOFException;
import java.io.IOException; import java.io.IOException;
import java.lang.Class;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.FSDataInputStream;
@ -98,6 +101,7 @@ public class SequenceFileLogReader implements HLog.Reader {
// Needed logging exceptions // Needed logging exceptions
Path path; Path path;
int edit = 0; int edit = 0;
long entryStart = 0;
public SequenceFileLogReader() { } public SequenceFileLogReader() { }
@ -125,6 +129,7 @@ public class SequenceFileLogReader implements HLog.Reader {
@Override @Override
public HLog.Entry next(HLog.Entry reuse) throws IOException { public HLog.Entry next(HLog.Entry reuse) throws IOException {
this.entryStart = this.reader.getPosition();
HLog.Entry e = reuse; HLog.Entry e = reuse;
if (e == null) { if (e == null) {
HLogKey key = HLog.newKey(conf); HLogKey key = HLog.newKey(conf);
@ -163,15 +168,28 @@ public class SequenceFileLogReader implements HLog.Reader {
} catch (IOException e) { } catch (IOException e) {
Log.warn("Failed getting position to add to throw", e); Log.warn("Failed getting position to add to throw", e);
} }
// Preserve EOFE because these are treated differently if it comes up during
// a split of logs // See what SequenceFile.Reader thinks is the end of the file
long end = Long.MAX_VALUE;
try {
Field fEnd = SequenceFile.Reader.class.getDeclaredField("end");
fEnd.setAccessible(true);
end = fEnd.getLong(this.reader);
} catch(Exception e) { /* reflection fail. keep going */ }
String msg = (this.path == null? "": this.path.toString()) + String msg = (this.path == null? "": this.path.toString()) +
", pos=" + pos + ", edit=" + this.edit; ", entryStart=" + entryStart + ", pos=" + pos +
if (ioe instanceof EOFException) { ((end == Long.MAX_VALUE) ? "" : ", end=" + end) +
EOFException eof = new EOFException(msg); ", edit=" + this.edit;
eof.initCause(ioe);
return eof; // Enhance via reflection so we don't change the original class type
} try {
return new IOException(msg, ioe); return (IOException) ioe.getClass()
.getConstructor(String.class)
.newInstance(msg)
.initCause(ioe);
} catch(Exception e) { /* reflection fail. keep going */ }
return ioe;
} }
} }