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19 package org.apache.hadoop.hbase.regionserver;
20
21 import java.io.IOException;
22
23 import org.apache.commons.logging.Log;
24 import org.apache.commons.logging.LogFactory;
25 import org.apache.hadoop.hbase.classification.InterfaceAudience;
26 import org.apache.hadoop.hbase.RemoteExceptionHandler;
27 import org.apache.hadoop.hbase.master.TableLockManager.TableLock;
28 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
29 import org.apache.hadoop.util.StringUtils;
30
31 import com.google.common.base.Preconditions;
32
33
34
35
36 @InterfaceAudience.Private
37 class RegionMergeRequest implements Runnable {
38 static final Log LOG = LogFactory.getLog(RegionMergeRequest.class);
39 private final HRegion region_a;
40 private final HRegion region_b;
41 private final HRegionServer server;
42 private final boolean forcible;
43 private TableLock tableLock;
44
45 RegionMergeRequest(HRegion a, HRegion b, HRegionServer hrs, boolean forcible) {
46 Preconditions.checkNotNull(hrs);
47 this.region_a = a;
48 this.region_b = b;
49 this.server = hrs;
50 this.forcible = forcible;
51 }
52
53 @Override
54 public String toString() {
55 return "MergeRequest,regions:" + region_a + ", " + region_b + ", forcible="
56 + forcible;
57 }
58
59 @Override
60 public void run() {
61 if (this.server.isStopping() || this.server.isStopped()) {
62 LOG.debug("Skipping merge because server is stopping="
63 + this.server.isStopping() + " or stopped=" + this.server.isStopped());
64 return;
65 }
66 try {
67 final long startTime = EnvironmentEdgeManager.currentTimeMillis();
68 RegionMergeTransaction mt = new RegionMergeTransaction(region_a,
69 region_b, forcible);
70
71
72
73 tableLock = server.getTableLockManager().readLock(region_a.getTableDesc().getTableName()
74 , "MERGE_REGIONS:" + region_a.getRegionNameAsString() + ", " + region_b.getRegionNameAsString());
75 try {
76 tableLock.acquire();
77 } catch (IOException ex) {
78 tableLock = null;
79 throw ex;
80 }
81
82
83
84 if (!mt.prepare(this.server)) return;
85 try {
86 mt.execute(this.server, this.server);
87 } catch (Exception e) {
88 if (this.server.isStopping() || this.server.isStopped()) {
89 LOG.info(
90 "Skip rollback/cleanup of failed merge of " + region_a + " and "
91 + region_b + " because server is"
92 + (this.server.isStopping() ? " stopping" : " stopped"), e);
93 return;
94 }
95 try {
96 LOG.warn("Running rollback/cleanup of failed merge of "
97 + region_a +" and "+ region_b + "; " + e.getMessage(), e);
98 if (mt.rollback(this.server, this.server)) {
99 LOG.info("Successful rollback of failed merge of "
100 + region_a +" and "+ region_b);
101 } else {
102 this.server.abort("Abort; we got an error after point-of-no-return"
103 + "when merging " + region_a + " and " + region_b);
104 }
105 } catch (RuntimeException ee) {
106 String msg = "Failed rollback of failed merge of "
107 + region_a +" and "+ region_b + " -- aborting server";
108
109
110 LOG.info(msg, ee);
111 this.server.abort(msg);
112 }
113 return;
114 }
115 LOG.info("Regions merged, hbase:meta updated, and report to master. region_a="
116 + region_a + ", region_b=" + region_b + ",merged region="
117 + mt.getMergedRegionInfo().getRegionNameAsString()
118 + ". Region merge took "
119 + StringUtils.formatTimeDiff(EnvironmentEdgeManager.currentTimeMillis(), startTime));
120 } catch (IOException ex) {
121 LOG.error("Merge failed " + this,
122 RemoteExceptionHandler.checkIOException(ex));
123 server.checkFileSystem();
124 } finally {
125 releaseTableLock();
126 }
127 }
128
129 protected void releaseTableLock() {
130 if (this.tableLock != null) {
131 try {
132 this.tableLock.release();
133 } catch (IOException ex) {
134 LOG.error("Could not release the table lock (something is really wrong). "
135 + "Aborting this server to avoid holding the lock forever.");
136 this.server.abort("Abort; we got an error when releasing the table lock "
137 + "on " + region_a.getRegionNameAsString());
138 }
139 }
140 }
141 }