[3/9] hbase-site git commit: Published site at f555258e7abab1337ee4d39aaa1dafff72be287b.

[git-site-role]

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/fa03a052/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.html
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diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.html
index 2736ca7..c5b3454 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.html
@@ -462,411 +462,418 @@
 <span class="sourceLineNo">454</span>   */<a name="line.454"></a>
 <span class="sourceLineNo">455</span>  @VisibleForTesting<a 
name="line.455"></a>
 <span class="sourceLineNo">456</span>  public boolean prepareSplitRegion(final 
MasterProcedureEnv env) throws IOException {<a name="line.456"></a>
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splittable<a name="line.457"></a>
-<span class="sourceLineNo">458</span>    RegionStateNode node =<a 
name="line.458"></a>
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env.getAssignmentManager().getRegionStates().getRegionStateNode(getParentRegion());<a
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-<span class="sourceLineNo">460</span><a name="line.460"></a>
-<span class="sourceLineNo">461</span>    if (node == null) {<a 
name="line.461"></a>
-<span class="sourceLineNo">462</span>      throw new 
UnknownRegionException(getParentRegion().getRegionNameAsString());<a 
name="line.462"></a>
+<span class="sourceLineNo">457</span>    // Fail if we are taking snapshot for 
the given table<a name="line.457"></a>
+<span class="sourceLineNo">458</span>    if 
(env.getMasterServices().getSnapshotManager()<a name="line.458"></a>
+<span class="sourceLineNo">459</span>      
.isTakingSnapshot(getParentRegion().getTable())) {<a name="line.459"></a>
+<span class="sourceLineNo">460</span>      setFailure(new IOException("Skip 
splitting region " + getParentRegion().getShortNameToLog() +<a 
name="line.460"></a>
+<span class="sourceLineNo">461</span>        ", because we are taking snapshot 
for the table " + getParentRegion().getTable()));<a name="line.461"></a>
+<span class="sourceLineNo">462</span>      return false;<a name="line.462"></a>
 <span class="sourceLineNo">463</span>    }<a name="line.463"></a>
-<span class="sourceLineNo">464</span><a name="line.464"></a>
-<span class="sourceLineNo">465</span>    RegionInfo parentHRI = 
node.getRegionInfo();<a name="line.465"></a>
-<span class="sourceLineNo">466</span>    if (parentHRI == null) {<a 
name="line.466"></a>
-<span class="sourceLineNo">467</span>      LOG.info("Unsplittable; parent 
region is null; node={}", node);<a name="line.467"></a>
-<span class="sourceLineNo">468</span>      return false;<a name="line.468"></a>
-<span class="sourceLineNo">469</span>    }<a name="line.469"></a>
-<span class="sourceLineNo">470</span>    // Lookup the parent HRI state from 
the AM, which has the latest updated info.<a name="line.470"></a>
-<span class="sourceLineNo">471</span>    // Protect against the case where 
concurrent SPLIT requests came in and succeeded<a name="line.471"></a>
-<span class="sourceLineNo">472</span>    // just before us.<a 
name="line.472"></a>
-<span class="sourceLineNo">473</span>    if (node.isInState(State.SPLIT)) {<a 
name="line.473"></a>
-<span class="sourceLineNo">474</span>      LOG.info("Split of " + parentHRI + 
" skipped; state is already SPLIT");<a name="line.474"></a>
+<span class="sourceLineNo">464</span>    // Check whether the region is 
splittable<a name="line.464"></a>
+<span class="sourceLineNo">465</span>    RegionStateNode node =<a 
name="line.465"></a>
+<span class="sourceLineNo">466</span>        
env.getAssignmentManager().getRegionStates().getRegionStateNode(getParentRegion());<a
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+<span class="sourceLineNo">467</span><a name="line.467"></a>
+<span class="sourceLineNo">468</span>    if (node == null) {<a 
name="line.468"></a>
+<span class="sourceLineNo">469</span>      throw new 
UnknownRegionException(getParentRegion().getRegionNameAsString());<a 
name="line.469"></a>
+<span class="sourceLineNo">470</span>    }<a name="line.470"></a>
+<span class="sourceLineNo">471</span><a name="line.471"></a>
+<span class="sourceLineNo">472</span>    RegionInfo parentHRI = 
node.getRegionInfo();<a name="line.472"></a>
+<span class="sourceLineNo">473</span>    if (parentHRI == null) {<a 
name="line.473"></a>
+<span class="sourceLineNo">474</span>      LOG.info("Unsplittable; parent 
region is null; node={}", node);<a name="line.474"></a>
 <span class="sourceLineNo">475</span>      return false;<a name="line.475"></a>
 <span class="sourceLineNo">476</span>    }<a name="line.476"></a>
-<span class="sourceLineNo">477</span>    if (parentHRI.isSplit() || 
parentHRI.isOffline()) {<a name="line.477"></a>
-<span class="sourceLineNo">478</span>      LOG.info("Split of " + parentHRI + 
" skipped because offline/split.");<a name="line.478"></a>
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(!node.isInState(EXPECTED_SPLIT_STATES)) {<a name="line.483"></a>
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node.getState() + "; expected " +<a name="line.486"></a>
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Arrays.toString(EXPECTED_SPLIT_STATES)));<a name="line.487"></a>
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-<span class="sourceLineNo">491</span>    // Since we have the lock and the 
master is coordinating the operation<a name="line.491"></a>
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region<a name="line.492"></a>
-<span class="sourceLineNo">493</span>    if 
(!env.getMasterServices().isSplitOrMergeEnabled(MasterSwitchType.SPLIT)) {<a 
name="line.493"></a>
-<span class="sourceLineNo">494</span>      LOG.warn("pid=" + getProcId() + " 
split switch is off! skip split of " + parentHRI);<a name="line.494"></a>
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region " + parentHRI.getRegionNameAsString() +<a name="line.495"></a>
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off"));<a name="line.496"></a>
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-<span class="sourceLineNo">499</span><a name="line.499"></a>
-<span class="sourceLineNo">500</span>    // set node state as SPLITTING<a 
name="line.500"></a>
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name="line.501"></a>
-<span class="sourceLineNo">502</span><a name="line.502"></a>
-<span class="sourceLineNo">503</span>    return true;<a name="line.503"></a>
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-<span class="sourceLineNo">505</span><a name="line.505"></a>
-<span class="sourceLineNo">506</span>  /**<a name="line.506"></a>
-<span class="sourceLineNo">507</span>   * Action before splitting region in a 
table.<a name="line.507"></a>
-<span class="sourceLineNo">508</span>   * @param env MasterProcedureEnv<a 
name="line.508"></a>
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-<span class="sourceLineNo">510</span>  private void preSplitRegion(final 
MasterProcedureEnv env)<a name="line.510"></a>
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InterruptedException {<a name="line.511"></a>
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env.getMasterCoprocessorHost();<a name="line.512"></a>
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name="line.513"></a>
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cpHost.preSplitRegionAction(getTableName(), getSplitRow(), getUser());<a 
name="line.514"></a>
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-<span class="sourceLineNo">516</span><a name="line.516"></a>
-<span class="sourceLineNo">517</span>    // TODO: Clean up split and merge. 
Currently all over the place.<a name="line.517"></a>
-<span class="sourceLineNo">518</span>    // Notify QuotaManager and 
RegionNormalizer<a name="line.518"></a>
-<span class="sourceLineNo">519</span>    try {<a name="line.519"></a>
-<span class="sourceLineNo">520</span>      
env.getMasterServices().getMasterQuotaManager().onRegionSplit(this.getParentRegion());<a
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{<a name="line.521"></a>
-<span class="sourceLineNo">522</span>      
env.getMasterServices().getRegionNormalizer().planSkipped(this.getParentRegion(),<a
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NormalizationPlan.PlanType.SPLIT);<a name="line.523"></a>
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-<span class="sourceLineNo">526</span>  }<a name="line.526"></a>
-<span class="sourceLineNo">527</span><a name="line.527"></a>
-<span class="sourceLineNo">528</span>  /**<a name="line.528"></a>
-<span class="sourceLineNo">529</span>   * Action after rollback a split table 
region action.<a name="line.529"></a>
-<span class="sourceLineNo">530</span>   * @param env MasterProcedureEnv<a 
name="line.530"></a>
-<span class="sourceLineNo">531</span>   */<a name="line.531"></a>
-<span class="sourceLineNo">532</span>  private void 
postRollBackSplitRegion(final MasterProcedureEnv env) throws IOException {<a 
name="line.532"></a>
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env.getMasterCoprocessorHost();<a name="line.533"></a>
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name="line.534"></a>
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cpHost.postRollBackSplitRegionAction(getUser());<a name="line.535"></a>
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-<span class="sourceLineNo">537</span>  }<a name="line.537"></a>
-<span class="sourceLineNo">538</span><a name="line.538"></a>
-<span class="sourceLineNo">539</span>  /**<a name="line.539"></a>
-<span class="sourceLineNo">540</span>   * Rollback close parent region<a 
name="line.540"></a>
-<span class="sourceLineNo">541</span>   */<a name="line.541"></a>
-<span class="sourceLineNo">542</span>  private void 
openParentRegion(MasterProcedureEnv env) throws IOException {<a 
name="line.542"></a>
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AssignmentManagerUtil.reopenRegionsForRollback(env,<a name="line.543"></a>
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Collections.singletonList((getParentRegion())), getRegionReplication(env),<a 
name="line.544"></a>
-<span class="sourceLineNo">545</span>      getParentRegionServerName(env));<a 
name="line.545"></a>
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-<span class="sourceLineNo">547</span><a name="line.547"></a>
-<span class="sourceLineNo">548</span>  /**<a name="line.548"></a>
-<span class="sourceLineNo">549</span>   * Create daughter regions<a 
name="line.549"></a>
-<span class="sourceLineNo">550</span>   */<a name="line.550"></a>
-<span class="sourceLineNo">551</span>  @VisibleForTesting<a 
name="line.551"></a>
-<span class="sourceLineNo">552</span>  public void createDaughterRegions(final 
MasterProcedureEnv env) throws IOException {<a name="line.552"></a>
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env.getMasterServices().getMasterFileSystem();<a name="line.553"></a>
-<span class="sourceLineNo">554</span>    final Path tabledir = 
FSUtils.getTableDir(mfs.getRootDir(), getTableName());<a name="line.554"></a>
-<span class="sourceLineNo">555</span>    final FileSystem fs = 
mfs.getFileSystem();<a name="line.555"></a>
-<span class="sourceLineNo">556</span>    HRegionFileSystem regionFs = 
HRegionFileSystem.openRegionFromFileSystem(<a name="line.556"></a>
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tabledir, getParentRegion(), false);<a name="line.557"></a>
-<span class="sourceLineNo">558</span>    regionFs.createSplitsDir();<a 
name="line.558"></a>
-<span class="sourceLineNo">559</span><a name="line.559"></a>
-<span class="sourceLineNo">560</span>    Pair&lt;Integer, Integer&gt; 
expectedReferences = splitStoreFiles(env, regionFs);<a name="line.560"></a>
-<span class="sourceLineNo">561</span><a name="line.561"></a>
-<span class="sourceLineNo">562</span>    assertReferenceFileCount(fs, 
expectedReferences.getFirst(),<a name="line.562"></a>
-<span class="sourceLineNo">563</span>      
regionFs.getSplitsDir(daughter_1_RI));<a name="line.563"></a>
-<span class="sourceLineNo">564</span>    //Move the files from the temporary 
.splits to the final /table/region directory<a name="line.564"></a>
-<span class="sourceLineNo">565</span>    
regionFs.commitDaughterRegion(daughter_1_RI);<a name="line.565"></a>
-<span class="sourceLineNo">566</span>    assertReferenceFileCount(fs, 
expectedReferences.getFirst(),<a name="line.566"></a>
-<span class="sourceLineNo">567</span>      new Path(tabledir, 
daughter_1_RI.getEncodedName()));<a name="line.567"></a>
+<span class="sourceLineNo">477</span>    // Lookup the parent HRI state from 
the AM, which has the latest updated info.<a name="line.477"></a>
+<span class="sourceLineNo">478</span>    // Protect against the case where 
concurrent SPLIT requests came in and succeeded<a name="line.478"></a>
+<span class="sourceLineNo">479</span>    // just before us.<a 
name="line.479"></a>
+<span class="sourceLineNo">480</span>    if (node.isInState(State.SPLIT)) {<a 
name="line.480"></a>
+<span class="sourceLineNo">481</span>      LOG.info("Split of " + parentHRI + 
" skipped; state is already SPLIT");<a name="line.481"></a>
+<span class="sourceLineNo">482</span>      return false;<a name="line.482"></a>
+<span class="sourceLineNo">483</span>    }<a name="line.483"></a>
+<span class="sourceLineNo">484</span>    if (parentHRI.isSplit() || 
parentHRI.isOffline()) {<a name="line.484"></a>
+<span class="sourceLineNo">485</span>      LOG.info("Split of " + parentHRI + 
" skipped because offline/split.");<a name="line.485"></a>
+<span class="sourceLineNo">486</span>      return false;<a name="line.486"></a>
+<span class="sourceLineNo">487</span>    }<a name="line.487"></a>
+<span class="sourceLineNo">488</span><a name="line.488"></a>
+<span class="sourceLineNo">489</span>    // expected parent to be online or 
closed<a name="line.489"></a>
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(!node.isInState(EXPECTED_SPLIT_STATES)) {<a name="line.490"></a>
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name="line.491"></a>
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+<span class="sourceLineNo">493</span>          " FAILED because state=" + 
node.getState() + "; expected " +<a name="line.493"></a>
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Arrays.toString(EXPECTED_SPLIT_STATES)));<a name="line.494"></a>
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master is coordinating the operation<a name="line.498"></a>
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region<a name="line.499"></a>
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(!env.getMasterServices().isSplitOrMergeEnabled(MasterSwitchType.SPLIT)) {<a 
name="line.500"></a>
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split switch is off! skip split of " + parentHRI);<a name="line.501"></a>
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region " + parentHRI.getRegionNameAsString() +<a name="line.502"></a>
+<span class="sourceLineNo">503</span>          " failed due to split switch 
off"));<a name="line.503"></a>
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cpHost.preSplitRegionAction(getTableName(), getSplitRow(), getUser());<a 
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RegionNormalizer<a name="line.525"></a>
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env.getMasterServices().getMasterQuotaManager().onRegionSplit(this.getParentRegion());<a
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{<a name="line.528"></a>
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env.getMasterServices().getRegionNormalizer().planSkipped(this.getParentRegion(),<a
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NormalizationPlan.PlanType.SPLIT);<a name="line.530"></a>
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region action.<a name="line.536"></a>
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+<span class="sourceLineNo">538</span>   */<a name="line.538"></a>
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postRollBackSplitRegion(final MasterProcedureEnv env) throws IOException {<a 
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env.getMasterCoprocessorHost();<a name="line.540"></a>
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cpHost.postRollBackSplitRegionAction(getUser());<a name="line.542"></a>
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openParentRegion(MasterProcedureEnv env) throws IOException {<a 
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AssignmentManagerUtil.reopenRegionsForRollback(env,<a name="line.550"></a>
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Collections.singletonList((getParentRegion())), getRegionReplication(env),<a 
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+<span class="sourceLineNo">558</span>  @VisibleForTesting<a 
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MasterProcedureEnv env) throws IOException {<a name="line.559"></a>
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env.getMasterServices().getMasterFileSystem();<a name="line.560"></a>
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FSUtils.getTableDir(mfs.getRootDir(), getTableName());<a name="line.561"></a>
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mfs.getFileSystem();<a name="line.562"></a>
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getParentRegion().getShortNameToLog() + ", threads=" + maxThreads);<a 
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env.getMasterServices().getTableDescriptors().get(getTableName());<a 
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WALSplitter.writeRegionSequenceIdFile(walFS, getWALRegionDir(env, 
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splitting / reference writing<a name="line.731"></a>
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implements Callable&lt;Pair&lt;Path,Path&gt;&gt; {<a name="line.734"></a>
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name="line.745"></a>
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throws IOException {<a name="line.752"></a>
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+<span class="sourceLineNo">756</span><a name="line.756"></a>
+<span class="sourceLineNo">757</span>  /**<a name="line.757"></a>
+<span class="sourceLineNo">758</span>   * Post split region actions before the 
Point-of-No-Return step<a name="line.758"></a>
+<span class="sourceLineNo">759</span>   * @param env MasterProcedureEnv<a 
name="line.759"></a>
+<span class="sourceLineNo">760</span>   **/<a name="line.760"></a>
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+<span class="sourceLineNo">762</span>      throws IOException, 
InterruptedException {<a name="line.762"></a>
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metaEntries = new ArrayList&lt;Mutation&gt;();<a name="line.763"></a>
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env.getMasterCoprocessorHost();<a name="line.764"></a>
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name="line.765"></a>
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cpHost.preSplitBeforeMETAAction(getSplitRow(), metaEntries, getUser());<a 
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+<span class="sourceLineNo">768</span>        for (Mutation p : metaEntries) 
{<a name="line.768"></a>
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RegionInfo.parseRegionName(p.getRow());<a name="line.769"></a>
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+<span class="sourceLineNo">771</span>      } catch (IOException e) {<a 
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" row key of mutation from coprocessor not parsable as "<a name="line.772"></a>
+<span class="sourceLineNo">773</span>            + "region name."<a 
name="line.773"></a>
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should only for hbase:meta table.");<a name="line.774"></a>
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+<span class="sourceLineNo">778</span>  }<a name="line.778"></a>
+<span class="sourceLineNo">779</span><a name="line.779"></a>
+<span class="sourceLineNo">780</span>  /**<a name="line.780"></a>
+<span class="sourceLineNo">781</span>   * Add daughter regions to META<a 
name="line.781"></a>
+<span class="sourceLineNo">782</span>   * @param env MasterProcedureEnv<a 
name="line.782"></a>
+<span class="sourceLineNo">783</span>   */<a name="line.783"></a>
+<span class="sourceLineNo">784</span>  private void updateMeta(final 
MasterProcedureEnv env) throws IOException {<a name="line.784"></a>
+<span class="sourceLineNo">785</span>    
env.getAssignmentManager().markRegionAsSplit(getParentRegion(), 
getParentRegionServerName(env),<a name="line.785"></a>
+<span class="sourceLineNo">786</span>      daughter_1_RI, daughter_2_RI);<a 
name="line.786"></a>
+<span class="sourceLineNo">787</span>  }<a name="line.787"></a>
+<span class="sourceLineNo">788</span><a name="line.788"></a>
+<span class="sourceLineNo">789</span>  /**<a name="line.789"></a>
+<span class="sourceLineNo">790</span>   * Pre split region actions after the 
Point-of-No-Return step<a name="line.790"></a>
+<span class="sourceLineNo">791</span>   * @param env MasterProcedureEnv<a 
name="line.791"></a>
+<span class="sourceLineNo">792</span>   **/<a name="line.792"></a>
+<span class="sourceLineNo">793</span>  private void 
preSplitRegionAfterMETA(final MasterProcedureEnv env)<a name="line.793"></a>
+<span class="sourceLineNo">794</span>      throws IOException, 
InterruptedException {<a name="line.794"></a>
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env.getMasterCoprocessorHost();<a name="line.795"></a>
+<span class="sourceLineNo">796</span>    if (cpHost != null) {<a 
name="line.796"></a>
+<span class="sourceLineNo">797</span>      
cpHost.preSplitAfterMETAAction(getUser());<a name="line.797"></a>
+<span class="sourceLineNo">798</span>    }<a name="line.798"></a>
+<span class="sourceLineNo">799</span>  }<a name="line.799"></a>
+<span class="sourceLineNo">800</span><a name="line.800"></a>
+<span class="sourceLineNo">801</span>  /**<a name="line.801"></a>
+<span class="sourceLineNo">802</span>   * Post split region actions<a 
name="line.802"></a>
+<span class="sourceLineNo">803</span>   * @param env MasterProcedureEnv<a 
name="line.803"></a>
+<span class="sourceLineNo">804</span>   **/<a name="line.804"></a>
+<span class="sourceLineNo">805</span>  private void postSplitRegion(final 
MasterProcedureEnv env) throws IOException {<a name="line.805"></a>
+<span class="sourceLineNo">806</span>    final MasterCoprocessorHost cpHost = 
env.getMasterCoprocessorHost();<a name="line.806"></a>
+<span class="sourceLineNo">807</span>    if (cpHost != null) {<a 
name="line.807"></a>
+<span class="sourceLineNo">808</span>      
cpHost.postCompletedSplitRegionAction(daughter_1_RI, daughter_2_RI, 
getUser());<a name="line.808"></a>
+<span class="sourceLineNo">809</span>    }<a name="line.809"></a>
+<span class="sourceLineNo">810</span>  }<a name="line.810"></a>
+<span class="sourceLineNo">811</span><a name="line.811"></a>
+<span class="sourceLineNo">812</span>  private ServerName 
getParentRegionServerName(final MasterProcedureEnv env) {<a name="line.812"></a>
+<span class="sourceLineNo">813</span>    return 
env.getMasterServices().getAssignmentManager().getRegionStates()<a 
name="line.813"></a>
+<span class="sourceLineNo">814</span>      
.getRegionServerOfRegion(getParentRegion());<a name="line.814"></a>
+<span class="sourceLineNo">815</span>  }<a name="line.815"></a>
+<span class="sourceLineNo">816</span><a name="line.816"></a>
+<span class="sourceLineNo">817</span>  private TransitRegionStateProcedure[] 
createUnassignProcedures(MasterProcedureEnv env)<a name="line.817"></a>
+<span class="sourceLineNo">818</span>      throws IOException {<a 
name="line.818"></a>
+<span class="sourceLineNo">819</span>    return 
AssignmentManagerUtil.createUnassignProceduresForSplitOrMerge(env,<a 
name="line.819"></a>
+<span class="sourceLineNo">820</span>      Stream.of(getParentRegion()), 
getRegionReplication(env));<a name="line.820"></a>
+<span class="sourceLineNo">821</span>  }<a name="line.821"></a>
+<span class="sourceLineNo">822</span><a name="line.822"></a>
+<span class="sourceLineNo">823</span>  private TransitRegionStateProcedure[] 
createAssignProcedures(MasterProcedureEnv env)<a name="line.823"></a>
+<span class="sourceLineNo">824</span>      throws IOException {<a 
name="line.824"></a>
+<span class="sourceLineNo">825</span>    List&lt;RegionInfo&gt; hris = new 
ArrayList&lt;RegionInfo&gt;(2);<a name="line.825"></a>
+<span class="sourceLineNo">826</span>    hris.add(daughter_1_RI);<a 
name="line.826"></a>
+<span class="sourceLineNo">827</span>    hris.add(daughter_2_RI);<a 
name="line.827"></a>
+<span class="sourceLineNo">828</span>    return 
AssignmentManagerUtil.createAssignProceduresForOpeningNewRegions(env, hris,<a 
name="line.828"></a>
+<span class="sourceLineNo">829</span>      getRegionReplication(env), 
getParentRegionServerName(env));<a name="line.829"></a>
+<span class="sourceLineNo">830</span>  }<a name="line.830"></a>
+<span class="sourceLineNo">831</span><a name="line.831"></a>
+<span class="sourceLineNo">832</span>  private int getRegionReplication(final 
MasterProcedureEnv env) throws IOException {<a name="line.832"></a>
+<span class="sourceLineNo">833</span>    final TableDescriptor htd = 
env.getMasterServices().getTableDescriptors().get(getTableName());<a 
name="line.833"></a>
+<span class="sourceLineNo">834</span>    return htd.getRegionReplication();<a 
name="line.834"></a>
+<span class="sourceLineNo">835</span>  }<a name="line.835"></a>
+<span class="sourceLineNo">836</span><a name="line.836"></a>
+<span class="sourceLineNo">837</span>  private void 
writeMaxSequenceIdFile(MasterProcedureEnv env) throws IOException {<a 
name="line.837"></a>
+<span class="sourceLineNo">838</span>    FileSystem walFS = 
env.getMasterServices().getMasterWalManager().getFileSystem();<a 
name="line.838"></a>
+<span class="sourceLineNo">839</span>    long maxSequenceId =<a 
name="line.839"></a>
+<span class="sourceLineNo">840</span>      
WALSplitter.getMaxRegionSequenceId(walFS, getWALRegionDir(env, 
getParentRegion()));<a name="line.840"></a>
+<span class="sourceLineNo">841</span>    if (maxSequenceId &gt; 0) {<a 
name="line.841"></a>
+<span class="sourceLineNo">842</span>      
WALSplitter.writeRegionSequenceIdFile(walFS, getWALRegionDir(env, 
daughter_1_RI),<a name="line.842"></a>
+<span class="sourceLineNo">843</span>          maxSequenceId);<a 
name="line.843"></a>
+<span class="sourceLineNo">844</span>      
WALSplitter.writeRegionSequenceIdFile(walFS, getWALRegionDir(env, 
daughter_2_RI),<a name="line.844"></a>
+<span class="sourceLineNo">845</span>          maxSequenceId);<a 
name="line.845"></a>
+<span class="sourceLineNo">846</span>    }<a name="line.846"></a>
+<span class="sourceLineNo">847</span>  }<a name="line.847"></a>
+<span class="sourceLineNo">848</span><a name="line.848"></a>
+<span class="sourceLineNo">849</span>  /**<a name="line.849"></a>
+<span class="sourceLineNo">850</span>   * The procedure could be restarted 
from a different machine. If the variable is null, we need to<a 
name="line.850"></a>
+<span class="sourceLineNo">851</span>   * retrieve it.<a name="line.851"></a>
+<span class="sourceLineNo">852</span>   * @return traceEnabled<a 
name="line.852"></a>
+<span class="sourceLineNo">853</span>   */<a name="line.853"></a>
+<span class="sourceLineNo">854</span>  private boolean isTraceEnabled() {<a 
name="line.854"></a>
+<span class="sourceLineNo">855</span>    if (traceEnabled == null) {<a 
name="line.855"></a>
+<span class="sourceLineNo">856</span>      traceEnabled = 
LOG.isTraceEnabled();<a name="line.856"></a>
+<span class="sourceLineNo">857</span>    }<a name="line.857"></a>
+<span class="sourceLineNo">858</span>    return traceEnabled;<a 
name="line.858"></a>
+<span class="sourceLineNo">859</span>  }<a name="line.859"></a>
+<span class="sourceLineNo">860</span><a name="line.860"></a>
+<span class="sourceLineNo">861</span>  @Override<a name="line.861"></a>
+<span class="sourceLineNo">862</span>  protected boolean 
abort(MasterProcedureEnv env) {<a name="line.862"></a>
+<span class="sourceLineNo">863</span>    // Abort means rollback. We can't 
rollback all steps. HBASE-18018 added abort to all<a name="line.863"></a>
+<span class="sourceLineNo">864</span>    // Procedures. Here is a Procedure 
that has a PONR and cannot be aborted wants it enters this<a 
name="line.864"></a>
+<span class="sourceLineNo">865</span>    // range of steps; what do we do for 
these should an operator want to cancel them? HBASE-20022.<a 
name="line.865"></a>
+<span class="sourceLineNo">866</span>    return 
isRollbackSupported(getCurrentState())? super.abort(env): false;<a 
name="line.866"></a>
+<span class="sourceLineNo">867</span>  }<a name="line.867"></a>
+<span class="sourceLineNo">868</span>}<a name="line.868"></a>
 
 
 

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/fa03a052/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/DisabledTableSnapshotHandler.html
----------------------------------------------------------------------
diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/DisabledTableSnapshotHandler.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/DisabledTableSnapshotHandler.html
index 80ce868..eebcb0f 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/DisabledTableSnapshotHandler.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/DisabledTableSnapshotHandler.html
@@ -130,7 +130,14 @@
 <span class="sourceLineNo">122</span>          + " as finished.");<a 
name="line.122"></a>
 <span class="sourceLineNo">123</span>    }<a name="line.123"></a>
 <span class="sourceLineNo">124</span>  }<a name="line.124"></a>
-<span class="sourceLineNo">125</span>}<a name="line.125"></a>
+<span class="sourceLineNo">125</span><a name="line.125"></a>
+<span class="sourceLineNo">126</span>  @Override<a name="line.126"></a>
+<span class="sourceLineNo">127</span>  protected boolean 
downgradeToSharedTableLock() {<a name="line.127"></a>
+<span class="sourceLineNo">128</span>    // for taking snapshot on disabled 
table, it is OK to always hold the exclusive lock, as we do<a 
name="line.128"></a>
+<span class="sourceLineNo">129</span>    // not need to assign the regions 
when there are region server crashes.<a name="line.129"></a>
+<span class="sourceLineNo">130</span>    return false;<a name="line.130"></a>
+<span class="sourceLineNo">131</span>  }<a name="line.131"></a>
+<span class="sourceLineNo">132</span>}<a name="line.132"></a>
 
 
 

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/fa03a052/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/EnabledTableSnapshotHandler.html
----------------------------------------------------------------------
diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/EnabledTableSnapshotHandler.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/EnabledTableSnapshotHandler.html
index f1e72ce..51dd0a5 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/EnabledTableSnapshotHandler.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/EnabledTableSnapshotHandler.html
@@ -140,7 +140,15 @@
 <span class="sourceLineNo">132</span>    monitor.rethrowException();<a 
name="line.132"></a>
 <span class="sourceLineNo">133</span>    status.setStatus("Completed 
referencing HFiles for the mob region of table: " + snapshotTable);<a 
name="line.133"></a>
 <span class="sourceLineNo">134</span>  }<a name="line.134"></a>
-<span class="sourceLineNo">135</span>}<a name="line.135"></a>
+<span class="sourceLineNo">135</span><a name="line.135"></a>
+<span class="sourceLineNo">136</span>  @Override<a name="line.136"></a>
+<span class="sourceLineNo">137</span>  protected boolean 
downgradeToSharedTableLock() {<a name="line.137"></a>
+<span class="sourceLineNo">138</span>    // return true here to change from 
exclusive lock to shared lock, so we can still assign regions<a 
name="line.138"></a>
+<span class="sourceLineNo">139</span>    // while taking snapshots. This is 
important, as region server crash can happen at any time, if<a 
name="line.139"></a>
+<span class="sourceLineNo">140</span>    // we can not assign regions then the 
cluster will be in trouble as the regions can not online.<a name="line.140"></a>
+<span class="sourceLineNo">141</span>    return true;<a name="line.141"></a>
+<span class="sourceLineNo">142</span>  }<a name="line.142"></a>
+<span class="sourceLineNo">143</span>}<a name="line.143"></a>
 
 
 

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/fa03a052/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
----------------------------------------------------------------------
diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
index 768cf5d..f746c7f 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
@@ -428,7 +428,7 @@
 <span class="sourceLineNo">420</span>   * @param tableName name of the table 
being snapshotted.<a name="line.420"></a>
 <span class="sourceLineNo">421</span>   * @return &lt;tt&gt;true&lt;/tt&gt; if 
there is a snapshot in progress on the specified table.<a name="line.421"></a>
 <span class="sourceLineNo">422</span>   */<a name="line.422"></a>
-<span class="sourceLineNo">423</span>  synchronized boolean 
isTakingSnapshot(final TableName tableName) {<a name="line.423"></a>
+<span class="sourceLineNo">423</span>  public synchronized boolean 
isTakingSnapshot(final TableName tableName) {<a name="line.423"></a>
 <span class="sourceLineNo">424</span>    SnapshotSentinel handler = 
this.snapshotHandlers.get(tableName);<a name="line.424"></a>
 <span class="sourceLineNo">425</span>    return handler != null &amp;&amp; 
!handler.isFinished();<a name="line.425"></a>
 <span class="sourceLineNo">426</span>  }<a name="line.426"></a>