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| <h1 title="Package" class="title">Package org.apache.hadoop.hdfs.server.datanode</h1> |
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| <caption><span>Interface Summary</span><span class="tabEnd"> </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/datanode/BPServiceActorAction.html" title="interface in org.apache.hadoop.hdfs.server.datanode">BPServiceActorAction</a></td> |
| <td class="colLast"> |
| <div class="block">Base class for BPServiceActor class |
| Issued by BPOfferSerivce class to tell BPServiceActor |
| to take several actions.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DiskBalancer.BlockMover.html" title="interface in org.apache.hadoop.hdfs.server.datanode">DiskBalancer.BlockMover</a></td> |
| <td class="colLast"> |
| <div class="block">BlockMover supports moving blocks across Volumes.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html" title="interface in org.apache.hadoop.hdfs.server.datanode">ReplicaInPipeline</a></td> |
| <td class="colLast"> |
| <div class="block">This defines the interface of a replica in Pipeline that's being written to</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ShortCircuitRegistry.Visitor.html" title="interface in org.apache.hadoop.hdfs.server.datanode">ShortCircuitRegistry.Visitor</a></td> |
| <td class="colLast"> </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"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ChunkChecksum.html" title="class in org.apache.hadoop.hdfs.server.datanode">ChunkChecksum</a></td> |
| <td class="colLast"> |
| <div class="block">holder class that holds checksum bytes and the length in a block at which |
| the checksum bytes end |
| |
| ex: length = 1023 and checksum is 4 bytes which is for 512 bytes, then |
| the checksum applies for the last chunk, or bytes 512 - 1023</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.BlockPoolReport.html" title="class in org.apache.hadoop.hdfs.server.datanode">DirectoryScanner.BlockPoolReport</a></td> |
| <td class="colLast"> |
| <div class="block">Helper class for compiling block info reports per block pool.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.ScanInfoVolumeReport.html" title="class in org.apache.hadoop.hdfs.server.datanode">DirectoryScanner.ScanInfoVolumeReport</a></td> |
| <td class="colLast"> |
| <div class="block">Helper class for compiling block info reports from report compiler threads.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DiskBalancer.DiskBalancerMover.html" title="class in org.apache.hadoop.hdfs.server.datanode">DiskBalancer.DiskBalancerMover</a></td> |
| <td class="colLast"> |
| <div class="block">Actual DataMover class for DiskBalancer.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DiskBalancer.VolumePair.html" title="class in org.apache.hadoop.hdfs.server.datanode">DiskBalancer.VolumePair</a></td> |
| <td class="colLast"> |
| <div class="block">Holds source and dest volumes UUIDs and their BasePaths |
| that disk balancer will be operating against.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ErrorReportAction.html" title="class in org.apache.hadoop.hdfs.server.datanode">ErrorReportAction</a></td> |
| <td class="colLast"> |
| <div class="block">A ErrorReportAction is an instruction issued by BPOfferService to |
| BPServiceActor about a particular block encapsulated in errorMessage.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/FinalizedReplica.html" title="class in org.apache.hadoop.hdfs.server.datanode">FinalizedReplica</a></td> |
| <td class="colLast"> |
| <div class="block">This class describes a replica that has been finalized.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/FSCachingGetSpaceUsed.Builder.html" title="class in org.apache.hadoop.hdfs.server.datanode">FSCachingGetSpaceUsed.Builder</a></td> |
| <td class="colLast"> |
| <div class="block">The builder class.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplica</a></td> |
| <td class="colLast"> |
| <div class="block">This class is used for all replicas which are on local storage media |
| and hence, are backed by files.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.ReplicaDirInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplica.ReplicaDirInfo</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplicaInPipeline.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplicaInPipeline</a></td> |
| <td class="colLast"> |
| <div class="block">This class defines a replica in a pipeline, which |
| includes a persistent replica being written to by a dfs client or |
| a temporary replica being replicated by a source datanode or |
| being copied for the balancing purpose.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaBeingWritten.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaBeingWritten</a></td> |
| <td class="colLast"> |
| <div class="block">This class represents replicas being written.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaBuilder.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaBuilder</a></td> |
| <td class="colLast"> |
| <div class="block">This class is to be used as a builder for <code>ReplicaInfo</code> objects.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaHandler.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaHandler</a></td> |
| <td class="colLast"> |
| <div class="block">This class includes a replica being actively written and the reference to |
| the fs volume where this replica is located.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaUnderRecovery.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaUnderRecovery</a></td> |
| <td class="colLast"> |
| <div class="block">This class represents replicas that are under block recovery |
| It has a recovery id that is equal to the generation stamp |
| that the replica will be bumped to after recovery |
| The recovery id is used to handle multiple concurrent block recoveries.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaWaitingToBeRecovered.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaWaitingToBeRecovered</a></td> |
| <td class="colLast"> |
| <div class="block">This class represents a replica that is waiting to be recovered.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReportBadBlockAction.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReportBadBlockAction</a></td> |
| <td class="colLast"> |
| <div class="block">ReportBadBlockAction is an instruction issued by {{BPOfferService}} to |
| {{BPServiceActor}} to report bad block to namenode</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/SecureDataNodeStarter.html" title="class in org.apache.hadoop.hdfs.server.datanode">SecureDataNodeStarter</a></td> |
| <td class="colLast"> |
| <div class="block">Utility class to start a datanode in a secure cluster, first obtaining |
| privileged resources before main startup and handing them to the datanode.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/SecureDataNodeStarter.SecureResources.html" title="class in org.apache.hadoop.hdfs.server.datanode">SecureDataNodeStarter.SecureResources</a></td> |
| <td class="colLast"> |
| <div class="block">Stash necessary resources needed for datanode operation in a secure env.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ShortCircuitRegistry.html" title="class in org.apache.hadoop.hdfs.server.datanode">ShortCircuitRegistry</a></td> |
| <td class="colLast"> |
| <div class="block">Manages client short-circuit memory segments on the DataNode.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ShortCircuitRegistry.NewShmInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode">ShortCircuitRegistry.NewShmInfo</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ShortCircuitRegistry.RegisteredShm.html" title="class in org.apache.hadoop.hdfs.server.datanode">ShortCircuitRegistry.RegisteredShm</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/StorageLocation.CheckContext.html" title="class in org.apache.hadoop.hdfs.server.datanode">StorageLocation.CheckContext</a></td> |
| <td class="colLast"> |
| <div class="block">Class to hold the parameters for running a <code>StorageLocation.check(org.apache.hadoop.hdfs.server.datanode.StorageLocation.CheckContext)</code>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/VolumeScanner.html" title="class in org.apache.hadoop.hdfs.server.datanode">VolumeScanner</a></td> |
| <td class="colLast"> |
| <div class="block">VolumeScanner scans a single volume.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <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"> </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/datanode/DataNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.datanode">DataNodeLayoutVersion.Feature</a></td> |
| <td class="colLast"> |
| <div class="block">Enums for features that change the layout version.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/FileIoProvider.OPERATION.html" title="enum in org.apache.hadoop.hdfs.server.datanode">FileIoProvider.OPERATION</a></td> |
| <td class="colLast"> |
| <div class="block">Lists the types of file system operations.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Exception Summary table, listing exceptions, and an explanation"> |
| <caption><span>Exception Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Exception</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/BPServiceActorActionException.html" title="class in org.apache.hadoop.hdfs.server.datanode">BPServiceActorActionException</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/DiskFileCorruptException.html" title="class in org.apache.hadoop.hdfs.server.datanode">DiskFileCorruptException</a></td> |
| <td class="colLast"> |
| <div class="block">When kernel report a "Input/output error", we use this exception to |
| represents some corruption(e.g.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaAlreadyExistsException.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaAlreadyExistsException</a></td> |
| <td class="colLast"> |
| <div class="block">Exception indicating that the target block already exists |
| and is not set to be recovered/overwritten.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/UnexpectedReplicaStateException.html" title="class in org.apache.hadoop.hdfs.server.datanode">UnexpectedReplicaStateException</a></td> |
| <td class="colLast"> |
| <div class="block">Exception indicating that the replica is in an unexpected state</div> |
| </td> |
| </tr> |
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