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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-project-dist / hadoop-hdfs / build / source / hadoop-hdfs-project / hadoop-hdfs / target / api / org / apache / hadoop / hdfs / server / blockmanagement / package-summary.html
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<h1 title="Package" class="title">Package&nbsp;org.apache.hadoop.hdfs.server.blockmanagement</h1>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockStatsMXBean.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">BlockStatsMXBean</a></td>
<td class="colLast">
<div class="block">This is an interface used to retrieve statistic information related to
block management.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorInterface</a></td>
<td class="colLast">
<div class="block">Interface used to implement a decommission and maintenance monitor class,
which is instantiated by the DatanodeAdminManager class.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStatistics.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeStatistics</a></td>
<td class="colLast">
<div class="block">Datanode statistics</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList">
<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/AvailableSpaceBlockPlacementPolicy.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">AvailableSpaceBlockPlacementPolicy</a></td>
<td class="colLast">
<div class="block">Space balanced block placement policy.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockIdManager.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockIdManager</a></td>
<td class="colLast">
<div class="block">BlockIdManager allocates the generation stamps and the block ID.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockInfoStriped.StorageAndBlockIndex.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockInfoStriped.StorageAndBlockIndex</a></td>
<td class="colLast">
<div class="block">This class contains datanode storage information and block index in the
block group.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerFaultInjector.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockManagerFaultInjector</a></td>
<td class="colLast">
<div class="block">Used to inject certain faults for testing.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyWithNodeGroup.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockPlacementPolicyWithNodeGroup</a></td>
<td class="colLast">
<div class="block">The class is responsible for choosing the desired number of targets
for placing block replicas on environment with node-group layer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementStatusDefault.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockPlacementStatusDefault</a></td>
<td class="colLast">&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockStoragePolicySuite.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockStoragePolicySuite</a></td>
<td class="colLast">
<div class="block">A collection of block storage policies.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/BlockUnderConstructionFeature.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">BlockUnderConstructionFeature</a></td>
<td class="colLast">
<div class="block">Represents the under construction feature of a Block.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/CombinedHostFileManager.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">CombinedHostFileManager</a></td>
<td class="colLast">
<div class="block">This class manages datanode configuration using a json file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminBackoffMonitor</a></td>
<td class="colLast">
<div class="block">This class implements the logic to track decommissioning and entering
maintenance nodes, ensure all their blocks are adequately replicated
before they are moved to the decommissioned or maintenance state.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminDefaultMonitor</a></td>
<td class="colLast">
<div class="block">Checks to see if datanodes have finished DECOMMISSION_INPROGRESS or
ENTERING_MAINTENANCE state.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorBase</a></td>
<td class="colLast">
<div class="block">This abstract class provides some base methods which are inherited by
the DatanodeAdmin BackOff and Default Monitors, which control decommission
and maintenance mode.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.CachedBlocksList.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeDescriptor.CachedBlocksList</a></td>
<td class="colLast">
<div class="block">A list of CachedBlock objects on this datanode.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStorageInfo.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeStorageInfo</a></td>
<td class="colLast">
<div class="block">A Datanode has one or more storages.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostFileManager</a></td>
<td class="colLast">
<div class="block">This class manages the include and exclude files for HDFS.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostSet.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostSet</a></td>
<td class="colLast">
<div class="block">The HostSet allows efficient queries on matching wildcard addresses.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/NumberReplicas.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">NumberReplicas</a></td>
<td class="colLast">
<div class="block">A immutable object that stores the number of live replicas and
the number of decommissioned Replicas.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/ProvidedStorageMap.ProvidedDescriptor.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">ProvidedStorageMap.ProvidedDescriptor</a></td>
<td class="colLast">
<div class="block">An abstract DatanodeDescriptor to track datanodes with provided storages.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/SlowDiskTracker.DiskLatency.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">SlowDiskTracker.DiskLatency</a></td>
<td class="colLast">
<div class="block">This structure is a thin wrapper over disk latencies.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/SlowPeerTracker.ReportForJson.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">SlowPeerTracker.ReportForJson</a></td>
<td class="colLast">
<div class="block">This structure is a thin wrapper over reports to make Json
[de]serialization easy.</div>
</td>
</tr>
</tbody>
</table>
</li>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Summary table, listing enums, and an explanation">
<caption><span>Enum Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Enum</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/CorruptReplicasMap.Reason.html" title="enum in org.apache.hadoop.hdfs.server.blockmanagement">CorruptReplicasMap.Reason</a></td>
<td class="colLast">
<div class="block">The corruption reason code</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.CachedBlocksList.Type.html" title="enum in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeDescriptor.CachedBlocksList.Type</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/NumberReplicas.StoredReplicaState.html" title="enum in org.apache.hadoop.hdfs.server.blockmanagement">NumberReplicas.StoredReplicaState</a></td>
<td class="colLast">&nbsp;</td>
</tr>
</tbody>
</table>
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<caption><span>Exception Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Exception</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
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<td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/UnresolvedTopologyException.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">UnresolvedTopologyException</a></td>
<td class="colLast">
<div class="block">This exception is thrown if resolving topology path
for a node fails.</div>
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