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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.DroppedSnapshotException;
27 import org.apache.hadoop.hbase.RemoteExceptionHandler;
28 import org.apache.hadoop.hbase.master.TableLockManager.TableLock;
29 import org.apache.hadoop.hbase.util.Bytes;
30 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
31 import org.apache.hadoop.hbase.util.Strings;
32 import org.apache.hadoop.util.StringUtils;
33
34 import com.google.common.base.Preconditions;
35
36
37
38
39 @InterfaceAudience.Private
40 class SplitRequest implements Runnable {
41 static final Log LOG = LogFactory.getLog(SplitRequest.class);
42 private final HRegion parent;
43 private final byte[] midKey;
44 private final HRegionServer server;
45 private TableLock tableLock;
46
47 SplitRequest(HRegion region, byte[] midKey, HRegionServer hrs) {
48 Preconditions.checkNotNull(hrs);
49 this.parent = region;
50 this.midKey = midKey;
51 this.server = hrs;
52 }
53
54 @Override
55 public String toString() {
56 return "regionName=" + parent + ", midKey=" + Bytes.toStringBinary(midKey);
57 }
58
59 @Override
60 public void run() {
61 if (this.server.isStopping() || this.server.isStopped()) {
62 LOG.debug("Skipping split because server is stopping=" +
63 this.server.isStopping() + " or stopped=" + this.server.isStopped());
64 return;
65 }
66 boolean success = false;
67 server.getMetrics().incrSplitRequest();
68 long startTime = EnvironmentEdgeManager.currentTimeMillis();
69 SplitTransaction st = new SplitTransaction(parent, midKey);
70 try {
71
72
73 tableLock = server.getTableLockManager().readLock(parent.getTableDesc().getTableName()
74 , "SPLIT_REGION:" + parent.getRegionNameAsString());
75 try {
76 tableLock.acquire();
77 } catch (IOException ex) {
78 tableLock = null;
79 throw ex;
80 }
81
82
83
84 if (!st.prepare()) return;
85 try {
86 st.execute(this.server, this.server);
87 success = true;
88 } catch (Exception e) {
89 if (this.server.isStopping() || this.server.isStopped()) {
90 LOG.info(
91 "Skip rollback/cleanup of failed split of "
92 + parent.getRegionNameAsString() + " because server is"
93 + (this.server.isStopping() ? " stopping" : " stopped"), e);
94 return;
95 }
96 if (e instanceof DroppedSnapshotException) {
97 server.abort("Replay of WAL required. Forcing server shutdown", e);
98 return;
99 }
100 try {
101 LOG.info("Running rollback/cleanup of failed split of " +
102 parent.getRegionNameAsString() + "; " + e.getMessage(), e);
103 if (st.rollback(this.server, this.server)) {
104 LOG.info("Successful rollback of failed split of " +
105 parent.getRegionNameAsString());
106 } else {
107 this.server.abort("Abort; we got an error after point-of-no-return");
108 }
109 } catch (RuntimeException ee) {
110 String msg = "Failed rollback of failed split of " +
111 parent.getRegionNameAsString() + " -- aborting server";
112
113 LOG.info(msg, ee);
114 this.server.abort(msg + " -- Cause: " + ee.getMessage());
115 }
116 return;
117 }
118 } catch (IOException ex) {
119 LOG.error("Split failed " + this, RemoteExceptionHandler.checkIOException(ex));
120 server.checkFileSystem();
121 } finally {
122 if (this.parent.getCoprocessorHost() != null) {
123 try {
124 this.parent.getCoprocessorHost().postCompleteSplit();
125 } catch (IOException io) {
126 LOG.error("Split failed " + this,
127 RemoteExceptionHandler.checkIOException(io));
128 }
129 }
130 if (parent.shouldForceSplit()) {
131 parent.clearSplit();
132 }
133 releaseTableLock();
134 long endTime = EnvironmentEdgeManager.currentTimeMillis();
135
136 server.getMetrics().updateSplitTime(endTime - startTime);
137 if (success) {
138 server.getMetrics().incrSplitSuccess();
139
140 LOG.info("Region split, hbase:meta updated, and report to master. Parent="
141 + parent.getRegionNameAsString() + ", new regions: "
142 + st.getFirstDaughter().getRegionNameAsString() + ", "
143 + st.getSecondDaughter().getRegionNameAsString() + ". Split took "
144 + StringUtils.formatTimeDiff(EnvironmentEdgeManager.currentTimeMillis(), startTime));
145 }
146
147 LOG.info("Split transaction journal:\n\t" + Strings.join("\n\t", st.getJournal()));
148 }
149 }
150
151 protected void releaseTableLock() {
152 if (this.tableLock != null) {
153 try {
154 this.tableLock.release();
155 } catch (IOException ex) {
156 LOG.error("Could not release the table lock (something is really wrong). "
157 + "Aborting this server to avoid holding the lock forever.");
158 this.server.abort("Abort; we got an error when releasing the table lock "
159 + "on " + parent.getRegionNameAsString());
160 }
161 }
162 }
163 }