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19 package org.apache.hadoop.hbase.chaos.actions;
20
21 import java.util.List;
22
23 import org.apache.commons.lang.math.RandomUtils;
24 import org.apache.hadoop.hbase.HBaseTestingUtility;
25 import org.apache.hadoop.hbase.HRegionInfo;
26 import org.apache.hadoop.hbase.client.HBaseAdmin;
27 import org.apache.hadoop.hbase.util.Bytes;
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32 public class MergeRandomAdjacentRegionsOfTableAction extends Action {
33 private final byte[] tableNameBytes;
34 private final String tableName;
35 private final long sleepTime;
36
37 public MergeRandomAdjacentRegionsOfTableAction(String tableName) {
38 this(-1, tableName);
39 }
40
41 public MergeRandomAdjacentRegionsOfTableAction(int sleepTime, String tableName) {
42 this.tableNameBytes = Bytes.toBytes(tableName);
43 this.tableName = tableName;
44 this.sleepTime = sleepTime;
45 }
46
47 @Override
48 public void perform() throws Exception {
49 HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
50 HBaseAdmin admin = util.getHBaseAdmin();
51
52 LOG.info("Performing action: Merge random adjacent regions of table " + tableName);
53 List<HRegionInfo> regions = admin.getTableRegions(tableNameBytes);
54 if (regions == null || regions.size() < 2) {
55 LOG.info("Table " + tableName + " doesn't have enough regions to merge");
56 return;
57 }
58
59 int i = RandomUtils.nextInt(regions.size() - 1);
60 HRegionInfo a = regions.get(i++);
61 HRegionInfo b = regions.get(i);
62 LOG.debug("Merging " + a.getRegionNameAsString() + " and " + b.getRegionNameAsString());
63 try {
64 admin.mergeRegions(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
65 } catch (Exception ex) {
66 LOG.warn("Merge failed, might be caused by other chaos: " + ex.getMessage());
67 }
68 if (sleepTime > 0) {
69 Thread.sleep(sleepTime);
70 }
71 }
72 }