HBASE-24368 Let HBCKSCP clear 'Unknown Servers', even if RegionStateNode has RegionLocation == null
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/GCMultipleMergedRegionsProcedure.java Edit a log. hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/HBCKServerCrashProcedure.java Add override of isMatchingRegionLocation. Allow 'null' as a pass in HBCKSCP. hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java Add a method for HBCKSCP to override and be less strict filtering assigns. hbase-server/src/main/resources/hbase-webapps/master/hbck.jsp Some doc on what 'Unknown Servers' are.
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@ -99,12 +99,11 @@ public class GCMultipleMergedRegionsProcedure extends
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case GC_MERGED_REGIONS_PREPARE:
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// If GCMultipleMergedRegionsProcedure processing is slower than the CatalogJanitor's scan
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// interval, it will end resubmitting GCMultipleMergedRegionsProcedure for the same
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// region, we can skip duplicate GCMultipleMergedRegionsProcedure while previous finished
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// region. We can skip duplicate GCMultipleMergedRegionsProcedure while previous finished
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List<RegionInfo> parents = MetaTableAccessor.getMergeRegions(
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env.getMasterServices().getConnection(), mergedChild.getRegionName());
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if (parents == null || parents.isEmpty()) {
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LOG.info("Region=" + mergedChild.getShortNameToLog()
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+ " info:merge qualifier has been deleted");
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LOG.info("{} mergeXXX qualifiers have ALL been deleted", mergedChild.getShortNameToLog());
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return Flow.NO_MORE_STATE;
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}
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setNextState(GCMergedRegionsState.GC_MERGED_REGIONS_PURGE);
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@ -30,6 +30,7 @@ import org.apache.hadoop.hbase.client.Connection;
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import org.apache.hadoop.hbase.client.RegionInfo;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.master.RegionState;
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import org.apache.hadoop.hbase.master.assignment.RegionStateNode;
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import org.apache.hadoop.hbase.master.assignment.RegionStateStore;
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import org.apache.yetus.audience.InterfaceAudience;
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import org.slf4j.Logger;
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@ -168,4 +169,16 @@ public class HBCKServerCrashProcedure extends ServerCrashProcedure {
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return this.reassigns;
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}
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}
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/**
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* The RegionStateNode will not have a location if a confirm of an OPEN fails. On fail,
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* the RegionStateNode regionLocation is set to null. This is 'looser' than the test done
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* in the superclass. The HBCKSCP has been scheduled by an operator via hbck2 probably at the
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* behest of a report of an 'Unknown Server' in the 'HBCK Report'. Let the operators operation
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* succeed even in case where the region location in the RegionStateNode is null.
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*/
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@Override
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protected boolean isMatchingRegionLocation(RegionStateNode rsn) {
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return super.isMatchingRegionLocation(rsn) || rsn.getRegionLocation() == null;
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}
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}
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@ -450,6 +450,15 @@ public class ServerCrashProcedure
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return false;
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}
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/**
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* Moved out here so can be overridden by the HBCK fix-up SCP to be less strict about what
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* it will tolerate as a 'match'.
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* @return True if the region location in <code>rsn</code> matches that of this crashed server.
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*/
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protected boolean isMatchingRegionLocation(RegionStateNode rsn) {
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return this.serverName.equals(rsn.getRegionLocation());
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}
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/**
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* Assign the regions on the crashed RS to other Rses.
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* <p/>
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@ -467,14 +476,17 @@ public class ServerCrashProcedure
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regionNode.lock();
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try {
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// This is possible, as when a server is dead, TRSP will fail to schedule a RemoteProcedure
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// to us and then try to assign the region to a new RS. And before it has updated the region
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// and then try to assign the region to a new RS. And before it has updated the region
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// location to the new RS, we may have already called the am.getRegionsOnServer so we will
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// consider the region is still on us. And then before we arrive here, the TRSP could have
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// updated the region location, or even finished itself, so the region is no longer on us
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// any more, we should not try to assign it again. Please see HBASE-23594 for more details.
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if (!serverName.equals(regionNode.getRegionLocation())) {
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LOG.info("{} found a region {} which is no longer on us {}, give up assigning...", this,
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regionNode, serverName);
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// consider the region is still on this crashed server. Then before we arrive here, the
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// TRSP could have updated the region location, or even finished itself, so the region is
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// no longer on this crashed server any more. We should not try to assign it again. Please
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// see HBASE-23594 for more details.
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// UPDATE: HBCKServerCrashProcedure overrides isMatchingRegionLocation; this check can get
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// in the way of our clearing out 'Unknown Servers'.
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if (!isMatchingRegionLocation(regionNode)) {
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LOG.info("{} found {} whose regionLocation no longer matches {}, skipping assign...",
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this, regionNode, serverName);
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continue;
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}
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if (regionNode.getProcedure() != null) {
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@ -112,8 +112,7 @@
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need to check the server still exists. If not, schedule <em>ServerCrashProcedure</em> for it. If exists,
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restart Server2 and Server1):
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3. More than one regionserver reports opened this region (Fix: restart the RegionServers).
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Notice: the reported online regionservers may be not right when there are regions in transition.
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Please check them in regionserver's web UI.
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Note: the reported online regionservers may be not be up-to-date when there are regions in transition.
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</span>
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</p>
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@ -165,8 +164,9 @@
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</div>
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<p>
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<span>
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The below are Regions we've lost account of. To be safe, run bulk load of any data found in these Region orphan directories back into the HBase cluster.
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First make sure <em>hbase:meta</em> is in a healthy state, that there are no holes, overlaps or inconsistencies (else bulk load may complain);
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The below are Regions we've lost account of. To be safe, run bulk load of any data found under these Region orphan directories to have the
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cluster re-adopt data.
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First make sure <em>hbase:meta</em> is in a healthy state, that there are no holes, overlaps or inconsistencies (else bulk load may fail);
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run <em>hbck2 fixMeta</em>. Once this is done, per Region below, run a bulk
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load -- <em>$ hbase completebulkload REGION_DIR_PATH TABLE_NAME</em> -- and then delete the desiccated directory content (HFiles are removed upon
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successful load; all that is left are empty directories and occasionally a seqid marking file).
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@ -259,6 +259,21 @@
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<h2>Unknown Servers</h2>
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</div>
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</div>
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<p>
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<span>The below are servers mentioned in the hbase:meta table that are no longer 'live' or known 'dead'.
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The server likely belongs to an older cluster epoch since replaced by a new instance because of a restart/crash.
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To clear 'Unknown Servers', run 'hbck2 scheduleRecoveries UNKNOWN_SERVERNAME'. This will schedule a ServerCrashProcedure.
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It will clear out 'Unknown Server' references and schedule reassigns of any Regions that were associated with this host.
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But first!, be sure the referenced Region is not currently stuck looping trying to OPEN. Does it show as a Region-In-Transition on the
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Master home page? Is it mentioned in the 'Procedures and Locks' Procedures list? If so, perhaps it stuck in a loop
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trying to OPEN but unable to because of a missing reference or file.
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Read the Master log looking for the most recent
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mentions of the associated Region name. Try and address any such complaint first. If successful, a side-effect
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should be the clean up of the 'Unknown Servers' list. It may take a while. OPENs are retried forever but the interval
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between retries grows. The 'Unknown Server' may be cleared because it is just the last RegionServer the Region was
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successfully opened on; on the next open, the 'Unknown Server' will be purged.
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</span>
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</p>
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<table class="table table-striped">
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<tr>
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<th>RegionInfo</th>
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