HDFS-13943. [JDK10] Fix javadoc errors in hadoop-hdfs-client module. Contributed by Akira Ajisaka.
This commit is contained in:
Takanobu Asanuma
parent
7d082193d2
commit
f6c5ef9903
|
|
@ -49,7 +49,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
|
|||
* not visible to the user except when getXAttr/getXAttrs is called on a file
|
||||
* or directory in the /.reserved/raw HDFS directory hierarchy. These
|
||||
* attributes can only be accessed by the superuser.
|
||||
* <p/>
|
||||
* <p>
|
||||
* @see <a href="http://en.wikipedia.org/wiki/Extended_file_attributes">
|
||||
* http://en.wikipedia.org/wiki/Extended_file_attributes</a>
|
||||
*
|
||||
|
|
|
|||
|
|
@ -20,11 +20,17 @@ package org.apache.hadoop.hdfs;
|
|||
import org.apache.hadoop.classification.InterfaceAudience;
|
||||
import org.apache.hadoop.classification.InterfaceStability;
|
||||
import org.apache.hadoop.fs.CreateFlag;
|
||||
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
|
||||
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
|
||||
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
|
||||
|
||||
import java.util.EnumSet;
|
||||
|
||||
/**
|
||||
* AddBlockFlag provides hints for new block allocation and placement.
|
||||
* Users can use this flag to control <em>per DFSOutputStream</em>
|
||||
* {@see ClientProtocol#addBlock()} behavior.
|
||||
* @see ClientProtocol#addBlock(String, String, ExtendedBlock, DatanodeInfo[],
|
||||
* long, String[], EnumSet)
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
@InterfaceStability.Evolving
|
||||
|
|
|
|||
|
|
@ -1054,8 +1054,8 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
|
|||
|
||||
/**
|
||||
* Call {@link #create(String, boolean, short, long, Progressable)} with
|
||||
* default <code>replication</code> and <code>blockSize<code> and null <code>
|
||||
* progress</code>.
|
||||
* default <code>replication</code> and <code>blockSize</code> and null
|
||||
* <code>progress</code>.
|
||||
*/
|
||||
public OutputStream create(String src, boolean overwrite)
|
||||
throws IOException {
|
||||
|
|
@ -1065,7 +1065,7 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
|
|||
|
||||
/**
|
||||
* Call {@link #create(String, boolean, short, long, Progressable)} with
|
||||
* default <code>replication</code> and <code>blockSize<code>.
|
||||
* default <code>replication</code> and <code>blockSize</code>.
|
||||
*/
|
||||
public OutputStream create(String src,
|
||||
boolean overwrite, Progressable progress) throws IOException {
|
||||
|
|
|
|||
|
|
@ -139,7 +139,7 @@ public class DFSInotifyEventInputStream {
|
|||
* are falling behind (i.e. transaction are being generated faster than the
|
||||
* client is reading them). If a client falls too far behind events may be
|
||||
* deleted before the client can read them.
|
||||
* <p/>
|
||||
* <p>
|
||||
* A return value of -1 indicates that an estimate could not be produced, and
|
||||
* should be ignored. The value returned by this method is really only useful
|
||||
* when compared to previous or subsequent returned values.
|
||||
|
|
|
|||
|
|
@ -294,12 +294,12 @@ public class DFSPacket {
|
|||
}
|
||||
|
||||
/**
|
||||
* Add a trace parent span for this packet.<p/>
|
||||
*
|
||||
* Add a trace parent span for this packet.
|
||||
* <p>
|
||||
* Trace parent spans for a packet are the trace spans responsible for
|
||||
* adding data to that packet. We store them as an array of longs for
|
||||
* efficiency.<p/>
|
||||
*
|
||||
* efficiency.
|
||||
* <p>
|
||||
* Protected by the DFSOutputStream dataQueue lock.
|
||||
*/
|
||||
public void addTraceParent(Span span) {
|
||||
|
|
@ -323,10 +323,10 @@ public class DFSPacket {
|
|||
}
|
||||
|
||||
/**
|
||||
* Get the trace parent spans for this packet.<p/>
|
||||
*
|
||||
* Will always be non-null.<p/>
|
||||
*
|
||||
* Get the trace parent spans for this packet.
|
||||
* <p>
|
||||
* Will always be non-null.
|
||||
* <p>
|
||||
* Protected by the DFSOutputStream dataQueue lock.
|
||||
*/
|
||||
public SpanId[] getTraceParents() {
|
||||
|
|
|
|||
|
|
@ -266,8 +266,8 @@ public class DFSUtilClient {
|
|||
}
|
||||
|
||||
/**
|
||||
* Convert a List<LocatedBlock> to BlockLocation[]
|
||||
* @param blocks A List<LocatedBlock> to be converted
|
||||
* Convert a List to BlockLocation[]
|
||||
* @param blocks A List to be converted
|
||||
* @return converted array of BlockLocation
|
||||
*/
|
||||
public static BlockLocation[] locatedBlocks2Locations(
|
||||
|
|
|
|||
|
|
@ -149,7 +149,6 @@ public class DistributedFileSystem extends FileSystem
|
|||
|
||||
/**
|
||||
* Return the protocol scheme for the FileSystem.
|
||||
* <p/>
|
||||
*
|
||||
* @return <code>hdfs</code>
|
||||
*/
|
||||
|
|
@ -1860,7 +1859,7 @@ public class DistributedFileSystem extends FileSystem
|
|||
return setSafeMode(SafeModeAction.SAFEMODE_GET, true);
|
||||
}
|
||||
|
||||
/** @see HdfsAdmin#allowSnapshot(Path) */
|
||||
/** @see org.apache.hadoop.hdfs.client.HdfsAdmin#allowSnapshot(Path) */
|
||||
public void allowSnapshot(final Path path) throws IOException {
|
||||
statistics.incrementWriteOps(1);
|
||||
storageStatistics.incrementOpCounter(OpType.ALLOW_SNAPSHOT);
|
||||
|
|
@ -1888,7 +1887,7 @@ public class DistributedFileSystem extends FileSystem
|
|||
}.resolve(this, absF);
|
||||
}
|
||||
|
||||
/** @see HdfsAdmin#disallowSnapshot(Path) */
|
||||
/** @see org.apache.hadoop.hdfs.client.HdfsAdmin#disallowSnapshot(Path) */
|
||||
public void disallowSnapshot(final Path path) throws IOException {
|
||||
statistics.incrementWriteOps(1);
|
||||
storageStatistics.incrementOpCounter(OpType.DISALLOW_SNAPSHOT);
|
||||
|
|
@ -2207,7 +2206,7 @@ public class DistributedFileSystem extends FileSystem
|
|||
}
|
||||
|
||||
/**
|
||||
* @see {@link #addCacheDirective(CacheDirectiveInfo, EnumSet)}
|
||||
* @see #addCacheDirective(CacheDirectiveInfo, EnumSet)
|
||||
*/
|
||||
public long addCacheDirective(CacheDirectiveInfo info) throws IOException {
|
||||
return addCacheDirective(info, EnumSet.noneOf(CacheFlag.class));
|
||||
|
|
@ -2234,7 +2233,7 @@ public class DistributedFileSystem extends FileSystem
|
|||
}
|
||||
|
||||
/**
|
||||
* @see {@link #modifyCacheDirective(CacheDirectiveInfo, EnumSet)}
|
||||
* @see #modifyCacheDirective(CacheDirectiveInfo, EnumSet)
|
||||
*/
|
||||
public void modifyCacheDirective(CacheDirectiveInfo info) throws IOException {
|
||||
modifyCacheDirective(info, EnumSet.noneOf(CacheFlag.class));
|
||||
|
|
@ -3305,10 +3304,10 @@ public class DistributedFileSystem extends FileSystem
|
|||
* Returns a RemoteIterator which can be used to list all open files
|
||||
* currently managed by the NameNode. For large numbers of open files,
|
||||
* iterator will fetch the list in batches of configured size.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Since the list is fetched in batches, it does not represent a
|
||||
* consistent snapshot of the all open files.
|
||||
* <p/>
|
||||
* <p>
|
||||
* This method can only be called by HDFS superusers.
|
||||
*/
|
||||
@Deprecated
|
||||
|
|
|
|||
|
|
@ -67,7 +67,7 @@ import org.apache.hadoop.security.UserGroupInformation;
|
|||
* non-HA-enabled client proxy as appropriate.
|
||||
*
|
||||
* For creating proxy objects with other protocols, please see
|
||||
* {@link NameNodeProxies#createProxy(Configuration, URI, Class)}.
|
||||
* NameNodeProxies#createProxy(Configuration, URI, Class).
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
public class NameNodeProxiesClient {
|
||||
|
|
@ -118,7 +118,6 @@ public class NameNodeProxiesClient {
|
|||
* @return an object containing both the proxy and the associated
|
||||
* delegation token service it corresponds to
|
||||
* @throws IOException if there is an error creating the proxy
|
||||
* @see {@link NameNodeProxies#createProxy(Configuration, URI, Class)}.
|
||||
*/
|
||||
public static ProxyAndInfo<ClientProtocol> createProxyWithClientProtocol(
|
||||
Configuration conf, URI nameNodeUri, AtomicBoolean fallbackToSimpleAuth)
|
||||
|
|
|
|||
|
|
@ -360,10 +360,10 @@ public class HdfsAdmin {
|
|||
* Returns a RemoteIterator which can be used to list the encryption zones
|
||||
* in HDFS. For large numbers of encryption zones, the iterator will fetch
|
||||
* the list of zones in a number of small batches.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Since the list is fetched in batches, it does not represent a
|
||||
* consistent snapshot of the entire list of encryption zones.
|
||||
* <p/>
|
||||
* <p>
|
||||
* This method can only be called by HDFS superusers.
|
||||
*/
|
||||
public RemoteIterator<EncryptionZone> listEncryptionZones()
|
||||
|
|
@ -418,7 +418,7 @@ public class HdfsAdmin {
|
|||
* for information on stream usage.
|
||||
* See {@link org.apache.hadoop.hdfs.inotify.Event}
|
||||
* for information on the available events.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Inotify users may want to tune the following HDFS parameters to
|
||||
* ensure that enough extra HDFS edits are saved to support inotify clients
|
||||
* that fall behind the current state of the namespace while reading events.
|
||||
|
|
@ -438,7 +438,7 @@ public class HdfsAdmin {
|
|||
* dfs.namenode.checkpoint.txns
|
||||
* dfs.namenode.num.checkpoints.retained
|
||||
* dfs.ha.log-roll.period
|
||||
* <p/>
|
||||
* <p>
|
||||
* It is recommended that local journaling be configured
|
||||
* (dfs.namenode.edits.dir) for inotify (in addition to a shared journal)
|
||||
* so that edit transfers from the shared journal can be avoided.
|
||||
|
|
@ -615,10 +615,10 @@ public class HdfsAdmin {
|
|||
* Returns a RemoteIterator which can be used to list all open files
|
||||
* currently managed by the NameNode. For large numbers of open files,
|
||||
* iterator will fetch the list in batches of configured size.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Since the list is fetched in batches, it does not represent a
|
||||
* consistent snapshot of the all open files.
|
||||
* <p/>
|
||||
* <p>
|
||||
* This method can only be called by HDFS superusers.
|
||||
*/
|
||||
@Deprecated
|
||||
|
|
|
|||
|
|
@ -70,7 +70,7 @@ import org.slf4j.LoggerFactory;
|
|||
* to renew the leases.
|
||||
* </li>
|
||||
* </ul>
|
||||
* </p>
|
||||
* <p>
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
public class LeaseRenewer {
|
||||
|
|
|
|||
|
|
@ -143,7 +143,7 @@ public interface ClientDatanodeProtocol {
|
|||
|
||||
/**
|
||||
* Get the status of the previously issued reconfig task.
|
||||
* @see {@link org.apache.hadoop.conf.ReconfigurationTaskStatus}.
|
||||
* @see org.apache.hadoop.conf.ReconfigurationTaskStatus
|
||||
*/
|
||||
ReconfigurationTaskStatus getReconfigurationStatus() throws IOException;
|
||||
|
||||
|
|
|
|||
|
|
@ -839,7 +839,7 @@ public interface ClientProtocol {
|
|||
* percentage called threshold of blocks, which satisfy the minimal
|
||||
* replication condition.
|
||||
* The minimal replication condition is that each block must have at least
|
||||
* <tt>dfs.namenode.replication.min</tt> replicas.
|
||||
* {@code dfs.namenode.replication.min} replicas.
|
||||
* When the threshold is reached the name node extends safe mode
|
||||
* for a configurable amount of time
|
||||
* to let the remaining data nodes to check in before it
|
||||
|
|
@ -855,12 +855,13 @@ public interface ClientProtocol {
|
|||
* Current state of the name node can be verified using
|
||||
* {@link #setSafeMode(HdfsConstants.SafeModeAction,boolean)
|
||||
* setSafeMode(SafeModeAction.SAFEMODE_GET,false)}
|
||||
* <h4>Configuration parameters:</h4>
|
||||
* <tt>dfs.safemode.threshold.pct</tt> is the threshold parameter.<br>
|
||||
* <tt>dfs.safemode.extension</tt> is the safe mode extension parameter.<br>
|
||||
* <tt>dfs.namenode.replication.min</tt> is the minimal replication parameter.
|
||||
*
|
||||
* <h4>Special cases:</h4>
|
||||
* <p><b>Configuration parameters:</b></p>
|
||||
* {@code dfs.safemode.threshold.pct} is the threshold parameter.<br>
|
||||
* {@code dfs.safemode.extension} is the safe mode extension parameter.<br>
|
||||
* {@code dfs.namenode.replication.min} is the minimal replication parameter.
|
||||
*
|
||||
* <p><b>Special cases:</b></p>
|
||||
* The name node does not enter safe mode at startup if the threshold is
|
||||
* set to 0 or if the name space is empty.<br>
|
||||
* If the threshold is set to 1 then all blocks need to have at least
|
||||
|
|
@ -1211,7 +1212,6 @@ public interface ClientProtocol {
|
|||
* Get a valid Delegation Token.
|
||||
*
|
||||
* @param renewer the designated renewer for the token
|
||||
* @return Token<DelegationTokenIdentifier>
|
||||
* @throws IOException
|
||||
*/
|
||||
@Idempotent
|
||||
|
|
@ -1490,7 +1490,7 @@ public interface ClientProtocol {
|
|||
throws IOException;
|
||||
|
||||
/**
|
||||
* Used to implement cursor-based batched listing of {@EncryptionZone}s.
|
||||
* Used to implement cursor-based batched listing of {@link EncryptionZone}s.
|
||||
*
|
||||
* @param prevId ID of the last item in the previous batch. If there is no
|
||||
* previous batch, a negative value can be used.
|
||||
|
|
@ -1513,7 +1513,7 @@ public interface ClientProtocol {
|
|||
|
||||
/**
|
||||
* Used to implement cursor-based batched listing of
|
||||
* {@ZoneReencryptionStatus}s.
|
||||
* {@link ZoneReencryptionStatus}s.
|
||||
*
|
||||
* @param prevId ID of the last item in the previous batch. If there is no
|
||||
* previous batch, a negative value can be used.
|
||||
|
|
@ -1528,7 +1528,7 @@ public interface ClientProtocol {
|
|||
* Set xattr of a file or directory.
|
||||
* The name must be prefixed with the namespace followed by ".". For example,
|
||||
* "user.attr".
|
||||
* <p/>
|
||||
* <p>
|
||||
* Refer to the HDFS extended attributes user documentation for details.
|
||||
*
|
||||
* @param src file or directory
|
||||
|
|
@ -1545,12 +1545,12 @@ public interface ClientProtocol {
|
|||
* If xAttrs is null or empty, this is the same as getting all xattrs of the
|
||||
* file or directory. Only those xattrs for which the logged-in user has
|
||||
* permissions to view are returned.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Refer to the HDFS extended attributes user documentation for details.
|
||||
*
|
||||
* @param src file or directory
|
||||
* @param xAttrs xAttrs to get
|
||||
* @return List<XAttr> <code>XAttr</code> list
|
||||
* @return <code>XAttr</code> list
|
||||
* @throws IOException
|
||||
*/
|
||||
@Idempotent
|
||||
|
|
@ -1561,11 +1561,11 @@ public interface ClientProtocol {
|
|||
* List the xattrs names for a file or directory.
|
||||
* Only the xattr names for which the logged in user has the permissions to
|
||||
* access will be returned.
|
||||
* <p/>
|
||||
* <p>
|
||||
* Refer to the HDFS extended attributes user documentation for details.
|
||||
*
|
||||
* @param src file or directory
|
||||
* @return List<XAttr> <code>XAttr</code> list
|
||||
* @return <code>XAttr</code> list
|
||||
* @throws IOException
|
||||
*/
|
||||
@Idempotent
|
||||
|
|
@ -1576,7 +1576,7 @@ public interface ClientProtocol {
|
|||
* Remove xattr of a file or directory.Value in xAttr parameter is ignored.
|
||||
* The name must be prefixed with the namespace followed by ".". For example,
|
||||
* "user.attr".
|
||||
* <p/>
|
||||
* <p>
|
||||
* Refer to the HDFS extended attributes user documentation for details.
|
||||
*
|
||||
* @param src file or directory
|
||||
|
|
|
|||
|
|
@ -45,7 +45,7 @@ public interface ReconfigurationProtocol {
|
|||
|
||||
/**
|
||||
* Get the status of the previously issued reconfig task.
|
||||
* @see {@link org.apache.hadoop.conf.ReconfigurationTaskStatus}.
|
||||
* @see org.apache.hadoop.conf.ReconfigurationTaskStatus
|
||||
*/
|
||||
@Idempotent
|
||||
ReconfigurationTaskStatus getReconfigurationStatus() throws IOException;
|
||||
|
|
|
|||
|
|
@ -182,13 +182,13 @@ public class BlockTokenIdentifier extends TokenIdentifier {
|
|||
* because we know the first field is the Expiry date.
|
||||
*
|
||||
* In the case of the legacy buffer, the expiry date is a VInt, so the size
|
||||
* (which should always be >1) is encoded in the first byte - which is
|
||||
* (which should always be >1) is encoded in the first byte - which is
|
||||
* always negative due to this encoding. However, there are sometimes null
|
||||
* BlockTokenIdentifier written so we also need to handle the case there
|
||||
* the first byte is also 0.
|
||||
*
|
||||
* In the case of protobuf, the first byte is a type tag for the expiry date
|
||||
* which is written as <code>(field_number << 3 | wire_type</code>.
|
||||
* which is written as <code>field_number << 3 | wire_type</code>.
|
||||
* So as long as the field_number is less than 16, but also positive, then
|
||||
* we know we have a Protobuf.
|
||||
*
|
||||
|
|
|
|||
|
|
@ -57,9 +57,8 @@ import org.slf4j.LoggerFactory;
|
|||
* slots in the set of existing segments, falling back to getting a new segment
|
||||
* from the DataNode via {@link DataTransferProtocol#requestShortCircuitFds}.
|
||||
*
|
||||
* The counterpart to this class on the DataNode is
|
||||
* {@link ShortCircuitRegistry}. See {@link ShortCircuitRegistry} for more
|
||||
* information on the communication protocol.
|
||||
* The counterpart to this class on the DataNode is ShortCircuitRegistry.
|
||||
* See ShortCircuitRegistry for more information on the communication protocol.
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
public class DfsClientShmManager implements Closeable {
|
||||
|
|
|
|||
|
|
@ -54,10 +54,10 @@ public abstract class ByteArrayManager {
|
|||
|
||||
/**
|
||||
* @return the least power of two greater than or equal to n, i.e. return
|
||||
* the least integer x with x >= n and x a power of two.
|
||||
* the least integer x with x >= n and x a power of two.
|
||||
*
|
||||
* @throws HadoopIllegalArgumentException
|
||||
* if n <= 0.
|
||||
* if n <= 0.
|
||||
*/
|
||||
public static int leastPowerOfTwo(final int n) {
|
||||
if (n <= 0) {
|
||||
|
|
|
|||
|
|
@ -53,7 +53,8 @@ import java.util.concurrent.TimeUnit;
|
|||
* illustrated in the following diagram. Unless otherwise specified, all
|
||||
* range-related calculations are inclusive (the end offset of the previous
|
||||
* range should be 1 byte lower than the start offset of the next one).
|
||||
*
|
||||
*/
|
||||
/*
|
||||
* | <---- Block Group ----> | <- Block Group: logical unit composing
|
||||
* | | striped HDFS files.
|
||||
* blk_0 blk_1 blk_2 <- Internal Blocks: each internal block
|
||||
|
|
@ -492,9 +493,12 @@ public class StripedBlockUtil {
|
|||
return stripes.toArray(new AlignedStripe[stripes.size()]);
|
||||
}
|
||||
|
||||
/**
|
||||
* Cell indexing convention defined in {@link StripingCell}.
|
||||
*/
|
||||
private static void calcualteChunkPositionsInBuf(int cellSize,
|
||||
AlignedStripe[] stripes, StripingCell[] cells, ByteBuffer buf) {
|
||||
/**
|
||||
/*
|
||||
* | <--------------- AlignedStripe --------------->|
|
||||
*
|
||||
* |<- length_0 ->|<-- length_1 -->|<- length_2 ->|
|
||||
|
|
@ -508,8 +512,6 @@ public class StripedBlockUtil {
|
|||
* | cell_0_0_0 | cell_1_0_1 and cell_2_0_2 |cell_3_1_0 ...| <- buf
|
||||
* | (partial) | (from blk_1 and blk_2) | |
|
||||
* +----------------------------------------------------------+
|
||||
*
|
||||
* Cell indexing convention defined in {@link StripingCell}
|
||||
*/
|
||||
int done = 0;
|
||||
for (StripingCell cell : cells) {
|
||||
|
|
@ -562,7 +564,11 @@ public class StripedBlockUtil {
|
|||
* its start and end offsets -- e.g., the end logical offset of cell_0_0_0
|
||||
* should be 1 byte lower than the start logical offset of cell_1_0_1.
|
||||
*
|
||||
* | <------- Striped Block Group -------> |
|
||||
* A StripingCell is a special instance of {@link StripingChunk} whose offset
|
||||
* and size align with the cell used when writing data.
|
||||
* TODO: consider parity cells
|
||||
*/
|
||||
/* | <------- Striped Block Group -------> |
|
||||
* blk_0 blk_1 blk_2
|
||||
* | | |
|
||||
* v v v
|
||||
|
|
@ -572,9 +578,6 @@ public class StripedBlockUtil {
|
|||
* |cell_3_1_0| |cell_4_1_1| |cell_5_1_2| <- {@link #idxInBlkGroup} = 5
|
||||
* +----------+ +----------+ +----------+ {@link #idxInInternalBlk} = 1
|
||||
* {@link #idxInStripe} = 2
|
||||
* A StripingCell is a special instance of {@link StripingChunk} whose offset
|
||||
* and size align with the cell used when writing data.
|
||||
* TODO: consider parity cells
|
||||
*/
|
||||
@VisibleForTesting
|
||||
public static class StripingCell {
|
||||
|
|
@ -622,6 +625,18 @@ public class StripedBlockUtil {
|
|||
* the diagram, any given byte range on a block group leads to 1~5
|
||||
* AlignedStripe's.
|
||||
*
|
||||
* An AlignedStripe is the basic unit of reading from a striped block group,
|
||||
* because within the AlignedStripe, all internal blocks can be processed in
|
||||
* a uniform manner.
|
||||
*
|
||||
* The coverage of an AlignedStripe on an internal block is represented as a
|
||||
* {@link StripingChunk}.
|
||||
*
|
||||
* To simplify the logic of reading a logical byte range from a block group,
|
||||
* a StripingChunk is either completely in the requested byte range or
|
||||
* completely outside the requested byte range.
|
||||
*/
|
||||
/*
|
||||
* |<-------- Striped Block Group -------->|
|
||||
* blk_0 blk_1 blk_2 blk_3 blk_4
|
||||
* +----+ | +----+ +----+
|
||||
|
|
@ -638,18 +653,7 @@ public class StripedBlockUtil {
|
|||
* | | | | | | | <- AlignedStripe4:
|
||||
* +----+ | +----+ +----+ last cell is partial
|
||||
* |
|
||||
* <---- data blocks ----> | <--- parity --->
|
||||
*
|
||||
* An AlignedStripe is the basic unit of reading from a striped block group,
|
||||
* because within the AlignedStripe, all internal blocks can be processed in
|
||||
* a uniform manner.
|
||||
*
|
||||
* The coverage of an AlignedStripe on an internal block is represented as a
|
||||
* {@link StripingChunk}.
|
||||
*
|
||||
* To simplify the logic of reading a logical byte range from a block group,
|
||||
* a StripingChunk is either completely in the requested byte range or
|
||||
* completely outside the requested byte range.
|
||||
* <---- data blocks ----> | <--- parity -->
|
||||
*/
|
||||
public static class AlignedStripe {
|
||||
public VerticalRange range;
|
||||
|
|
@ -691,7 +695,8 @@ public class StripedBlockUtil {
|
|||
* starting at {@link #offsetInBlock} and lasting for {@link #spanInBlock}
|
||||
* bytes in an internal block. Note that VerticalRange doesn't necessarily
|
||||
* align with {@link StripingCell}.
|
||||
*
|
||||
*/
|
||||
/*
|
||||
* |<- Striped Block Group ->|
|
||||
* blk_0
|
||||
* |
|
||||
|
|
@ -735,8 +740,8 @@ public class StripedBlockUtil {
|
|||
/**
|
||||
* Indicates the coverage of an {@link AlignedStripe} on an internal block,
|
||||
* and the state of the chunk in the context of the read request.
|
||||
*
|
||||
* |<---------------- Striped Block Group --------------->|
|
||||
*/
|
||||
/* |<---------------- Striped Block Group --------------->|
|
||||
* blk_0 blk_1 blk_2 blk_3 blk_4
|
||||
* +---------+ | +----+ +----+
|
||||
* null null |REQUESTED| | |null| |null| <- AlignedStripe0
|
||||
|
|
@ -745,7 +750,7 @@ public class StripedBlockUtil {
|
|||
* +---------+ +---------+ +---------+ | +----+ +----+
|
||||
* |REQUESTED| |REQUESTED| ALLZERO | |null| |null| <- AlignedStripe2
|
||||
* +---------+ +---------+ | +----+ +----+
|
||||
* <----------- data blocks ------------> | <--- parity --->
|
||||
* <----------- data blocks ------------> | <--- parity -->
|
||||
*/
|
||||
public static class StripingChunk {
|
||||
/** Chunk has been successfully fetched */
|
||||
|
|
@ -767,10 +772,12 @@ public class StripedBlockUtil {
|
|||
|
||||
/**
|
||||
* If a chunk is completely in requested range, the state transition is:
|
||||
* REQUESTED (when AlignedStripe created) -> PENDING -> {FETCHED | MISSING}
|
||||
* REQUESTED (when AlignedStripe created) -> PENDING ->
|
||||
* {FETCHED | MISSING}
|
||||
* If a chunk is completely outside requested range (including parity
|
||||
* chunks), state transition is:
|
||||
* null (AlignedStripe created) -> REQUESTED (upon failure) -> PENDING ...
|
||||
* null (AlignedStripe created) ->REQUESTED (upon failure) ->
|
||||
* PENDING ...
|
||||
*/
|
||||
public int state = REQUESTED;
|
||||
|
||||
|
|
|
|||
|
|
@ -176,7 +176,6 @@ public class WebHdfsFileSystem extends FileSystem
|
|||
|
||||
/**
|
||||
* Return the protocol scheme for the FileSystem.
|
||||
* <p/>
|
||||
*
|
||||
* @return <code>webhdfs</code>
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue