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18 package org.apache.hadoop.hbase.master.cleaner;
19
20 import java.io.IOException;
21
22 import org.apache.commons.logging.Log;
23 import org.apache.commons.logging.LogFactory;
24 import org.apache.hadoop.hbase.classification.InterfaceAudience;
25 import org.apache.hadoop.conf.Configuration;
26 import org.apache.hadoop.fs.FileStatus;
27 import org.apache.hadoop.fs.FileSystem;
28 import org.apache.hadoop.fs.Path;
29 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
30 import org.apache.hadoop.hbase.io.HFileLink;
31 import org.apache.hadoop.hbase.util.FSUtils;
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41 @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
42 public class HFileLinkCleaner extends BaseHFileCleanerDelegate {
43 private static final Log LOG = LogFactory.getLog(HFileLinkCleaner.class);
44
45 private FileSystem fs = null;
46
47 @Override
48 public synchronized boolean isFileDeletable(FileStatus fStat) {
49 if (this.fs == null) return false;
50 Path filePath = fStat.getPath();
51
52 if (HFileLink.isHFileLink(filePath)) return true;
53
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56 Path parentDir = filePath.getParent();
57 if (HFileLink.isBackReferencesDir(parentDir)) {
58 Path hfilePath = null;
59 try {
60 hfilePath = HFileLink.getHFileFromBackReference(getConf(), filePath);
61 return !fs.exists(hfilePath);
62 } catch (IOException e) {
63 if (LOG.isDebugEnabled()) {
64 LOG.debug("Couldn't verify if the referenced file still exists, keep it just in case: "
65 + hfilePath);
66 }
67 return false;
68 }
69 }
70
71
72 Path backRefDir = null;
73 try {
74 backRefDir = HFileLink.getBackReferencesDir(parentDir, filePath.getName());
75 return FSUtils.listStatus(fs, backRefDir) == null;
76 } catch (IOException e) {
77 if (LOG.isDebugEnabled()) {
78 LOG.debug("Couldn't get the references, not deleting file, just in case. filePath="
79 + filePath + ", backRefDir=" + backRefDir);
80 }
81 return false;
82 }
83 }
84
85 @Override
86 public void setConf(Configuration conf) {
87 super.setConf(conf);
88
89
90 try {
91 this.fs = FileSystem.get(this.getConf());
92 } catch (IOException e) {
93 if (LOG.isDebugEnabled()) {
94 LOG.debug("Couldn't instantiate the file system, not deleting file, just in case. "
95 + FileSystem.FS_DEFAULT_NAME_KEY + "="
96 + getConf().get(FileSystem.FS_DEFAULT_NAME_KEY, "file:///"));
97 }
98 }
99 }
100 }