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HDFS-15488. Add a command to list all snapshots for a snaphottable ro…
…ot with snapshot Ids. (#2166)
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226 changes: 226 additions & 0 deletions
226
...ject/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotStatus.java
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|---|---|---|
| @@ -0,0 +1,226 @@ | ||
| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * <p> | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * <p> | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.hadoop.hdfs.protocol; | ||
|
|
||
| import java.io.PrintStream; | ||
| import java.text.SimpleDateFormat; | ||
| import java.util.Date; | ||
| import java.util.EnumSet; | ||
|
|
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| import org.apache.hadoop.fs.Path; | ||
| import org.apache.hadoop.fs.permission.FsPermission; | ||
| import org.apache.hadoop.hdfs.DFSUtilClient; | ||
|
|
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| /** | ||
| * Metadata about a snapshottable directory. | ||
| */ | ||
| public class SnapshotStatus { | ||
| /** | ||
| * Basic information of the snapshot directory. | ||
| */ | ||
| private final HdfsFileStatus dirStatus; | ||
|
|
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| /** | ||
| * Snapshot ID for the snapshot. | ||
| */ | ||
| private final int snapshotID; | ||
|
|
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| /** | ||
| * Full path of the parent. | ||
| */ | ||
| private byte[] parentFullPath; | ||
|
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| public SnapshotStatus(long modificationTime, long accessTime, | ||
| FsPermission permission, | ||
| EnumSet<HdfsFileStatus.Flags> flags, | ||
| String owner, String group, byte[] localName, | ||
| long inodeId, int childrenNum, int snapshotID, | ||
| byte[] parentFullPath) { | ||
| this.dirStatus = new HdfsFileStatus.Builder() | ||
| .isdir(true) | ||
| .mtime(modificationTime) | ||
| .atime(accessTime) | ||
| .perm(permission) | ||
| .flags(flags) | ||
| .owner(owner) | ||
| .group(group) | ||
| .path(localName) | ||
| .fileId(inodeId) | ||
| .children(childrenNum) | ||
| .build(); | ||
| this.snapshotID = snapshotID; | ||
| this.parentFullPath = parentFullPath; | ||
| } | ||
|
|
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| public SnapshotStatus(HdfsFileStatus dirStatus, | ||
| int snapshotNumber, byte[] parentFullPath) { | ||
| this.dirStatus = dirStatus; | ||
| this.snapshotID = snapshotNumber; | ||
| this.parentFullPath = parentFullPath; | ||
| } | ||
|
|
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| /** | ||
| * sets the prent path name. | ||
| * @param path parent path | ||
| */ | ||
| public void setParentFullPath(byte[] path) { | ||
| parentFullPath = path; | ||
| } | ||
|
|
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| /** | ||
| * @return snapshot id for the snapshot | ||
| */ | ||
| public int getSnapshotID() { | ||
| return snapshotID; | ||
| } | ||
|
|
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| /** | ||
| * @return The basic information of the directory | ||
| */ | ||
| public HdfsFileStatus getDirStatus() { | ||
| return dirStatus; | ||
| } | ||
|
|
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| /** | ||
| * @return Full path of the file | ||
| */ | ||
| public byte[] getParentFullPath() { | ||
| return parentFullPath; | ||
| } | ||
|
|
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| /** | ||
| * @return Full path of the snapshot | ||
| */ | ||
| public Path getFullPath() { | ||
| String parentFullPathStr = | ||
| (parentFullPath == null || parentFullPath.length == 0) ? | ||
| "/" : DFSUtilClient.bytes2String(parentFullPath); | ||
| return new Path(getSnapshotPath(parentFullPathStr, | ||
| dirStatus.getLocalName())); | ||
| } | ||
|
|
||
| /** | ||
| * Print a list of {@link SnapshotStatus} out to a given stream. | ||
| * | ||
| * @param stats The list of {@link SnapshotStatus} | ||
| * @param out The given stream for printing. | ||
| */ | ||
| public static void print(SnapshotStatus[] stats, | ||
| PrintStream out) { | ||
| if (stats == null || stats.length == 0) { | ||
| out.println(); | ||
| return; | ||
| } | ||
| int maxRepl = 0, maxLen = 0, maxOwner = 0, maxGroup = 0; | ||
| int maxSnapshotID = 0; | ||
| for (SnapshotStatus status : stats) { | ||
| maxRepl = maxLength(maxRepl, status.dirStatus.getReplication()); | ||
| maxLen = maxLength(maxLen, status.dirStatus.getLen()); | ||
| maxOwner = maxLength(maxOwner, status.dirStatus.getOwner()); | ||
| maxGroup = maxLength(maxGroup, status.dirStatus.getGroup()); | ||
| maxSnapshotID = maxLength(maxSnapshotID, status.snapshotID); | ||
| } | ||
|
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| String lineFormat = "%s%s " // permission string | ||
| + "%" + maxRepl + "s " | ||
| + (maxOwner > 0 ? "%-" + maxOwner + "s " : "%s") | ||
| + (maxGroup > 0 ? "%-" + maxGroup + "s " : "%s") | ||
| + "%" + maxLen + "s " | ||
| + "%s " // mod time | ||
| + "%" + maxSnapshotID + "s " | ||
| + "%s"; // path | ||
| SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm"); | ||
|
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| for (SnapshotStatus status : stats) { | ||
| String line = String.format(lineFormat, "d", | ||
| status.dirStatus.getPermission(), | ||
| status.dirStatus.getReplication(), | ||
| status.dirStatus.getOwner(), | ||
| status.dirStatus.getGroup(), | ||
| String.valueOf(status.dirStatus.getLen()), | ||
| dateFormat.format(new Date(status.dirStatus.getModificationTime())), | ||
| status.snapshotID, | ||
| getSnapshotPath(DFSUtilClient.bytes2String(status.parentFullPath), | ||
| status.dirStatus.getLocalName()) | ||
| ); | ||
| out.println(line); | ||
| } | ||
| } | ||
|
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| private static int maxLength(int n, Object value) { | ||
| return Math.max(n, String.valueOf(value).length()); | ||
| } | ||
|
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| public static class Bean { | ||
| private final String path; | ||
| private final int snapshotID; | ||
| private final long modificationTime; | ||
| private final short permission; | ||
| private final String owner; | ||
| private final String group; | ||
|
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| public Bean(String path, int snapshotID, long | ||
| modificationTime, short permission, String owner, String group) { | ||
| this.path = path; | ||
| this.snapshotID = snapshotID; | ||
| this.modificationTime = modificationTime; | ||
| this.permission = permission; | ||
| this.owner = owner; | ||
| this.group = group; | ||
| } | ||
|
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| public String getPath() { | ||
| return path; | ||
| } | ||
|
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| public int getSnapshotID() { | ||
| return snapshotID; | ||
| } | ||
|
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| public long getModificationTime() { | ||
| return modificationTime; | ||
| } | ||
|
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| public short getPermission() { | ||
| return permission; | ||
| } | ||
|
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| public String getOwner() { | ||
| return owner; | ||
| } | ||
|
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| public String getGroup() { | ||
| return group; | ||
| } | ||
| } | ||
|
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| static String getSnapshotPath(String snapshottableDir, | ||
| String snapshotRelativePath) { | ||
| String parentFullPathStr = | ||
| snapshottableDir == null || snapshottableDir.isEmpty() ? | ||
| "/" : snapshottableDir; | ||
| final StringBuilder b = new StringBuilder(parentFullPathStr); | ||
| if (b.charAt(b.length() - 1) != Path.SEPARATOR_CHAR) { | ||
| b.append(Path.SEPARATOR); | ||
| } | ||
| return b.append(HdfsConstants.DOT_SNAPSHOT_DIR) | ||
| .append(Path.SEPARATOR) | ||
| .append(snapshotRelativePath) | ||
| .toString(); | ||
| } | ||
| } |
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