/**
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.hive.ql;
import java.io.DataInput;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import org.antlr.runtime.TokenRewriteStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.common.FileUtils;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.lockmgr.HiveLock;
import org.apache.hadoop.hive.ql.lockmgr.HiveLockManager;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.hadoop.util.StringUtils;
/**
* Context for Semantic Analyzers. Usage: not reusable - construct a new one for
* each query should call clear() at end of use to remove temporary folders
*/
public class Context {
private Path resFile;
private Path resDir;
private FileSystem resFs;
private static final Log LOG = LogFactory.getLog("hive.ql.Context");
private Path[] resDirPaths;
private int resDirFilesNum;
boolean initialized;
String originalTracker = null;
private final Map<String, ContentSummary> pathToCS = new ConcurrentHashMap<String, ContentSummary>();
// scratch path to use for all non-local (ie. hdfs) file system tmp folders
private final Path nonLocalScratchPath;
// scratch directory to use for local file system tmp folders
private final String localScratchDir;
// Keeps track of scratch directories created for different scheme/authority
private final Map<String, String> fsScratchDirs = new HashMap<String, String>();
private final Configuration conf;
protected int pathid = 10000;
protected boolean explain = false;
protected String cmd = "";
// number of previous attempts
protected int tryCount = 0;
private TokenRewriteStream tokenRewriteStream;
String executionId;
// List of Locks for this query
protected List<HiveLock> hiveLocks;
protected HiveLockManager hiveLockMgr;
private boolean needLockMgr;
public Context(Configuration conf) throws IOException {
this(conf, generateExecutionId());
}
/**
* Create a Context with a given executionId. ExecutionId, together with
* user name and conf, will determine the temporary directory locations.
*/
public Context(Configuration conf, String executionId) {
this.conf = conf;
this.executionId = executionId;
// non-local tmp location is configurable. however it is the same across
// all external file systems
nonLocalScratchPath =
new Path(HiveConf.getVar(conf, HiveConf.ConfVars.SCRATCHDIR),
executionId);
// local tmp location is not configurable for now
localScratchDir = System.getProperty("java.io.tmpdir")
+ Path.SEPARATOR + System.getProperty("user.name") + Path.SEPARATOR
+ executionId;
}
/**
* Set the context on whether the current query is an explain query.
* @param value true if the query is an explain query, false if not
*/
public void setExplain(boolean value) {
explain = value;
}
/**
* Find whether the current query is an explain query
* @return true if the query is an explain query, false if not
*/
public boolean getExplain () {
return explain;
}
/**
* Set the original query command.
* @param cmd the original query command string
*/
public void setCmd(String cmd) {
this.cmd = cmd;
}
/**
* Find the original query command.
* @return the original query command string
*/
public String getCmd () {
return cmd;
}
/**
* Get a tmp directory on specified URI
*
* @param scheme Scheme of the target FS
* @param authority Authority of the target FS
* @param mkdir create the directory if true
* @param scratchdir path of tmp directory
*/
private String getScratchDir(String scheme, String authority,
boolean mkdir, String scratchDir) {
String fileSystem = scheme + ":" + authority;
String dir = fsScratchDirs.get(fileSystem);
if (dir == null) {
Path dirPath = new Path(scheme, authority, scratchDir);
if (mkdir) {
try {
FileSystem fs = dirPath.getFileSystem(conf);
dirPath = new Path(fs.makeQualified(dirPath).toString());
if (!fs.mkdirs(dirPath)) {
throw new RuntimeException("Cannot make directory: "
+ dirPath.toString());
}
} catch (IOException e) {
throw new RuntimeException (e);
}
}
dir = dirPath.toString();
fsScratchDirs.put(fileSystem, dir);
}
return dir;
}
/**
* Create a local scratch directory on demand and return it.
*/
public String getLocalScratchDir(boolean mkdir) {
try {
FileSystem fs = FileSystem.getLocal(conf);
URI uri = fs.getUri();
return getScratchDir(uri.getScheme(), uri.getAuthority(),
mkdir, localScratchDir);
} catch (IOException e) {
throw new RuntimeException (e);
}
}
/**
* Create a map-reduce scratch directory on demand and return it.
*
*/
public String getMRScratchDir() {
// if we are executing entirely on the client side - then
// just (re)use the local scratch directory
if(isLocalOnlyExecutionMode()) {
return getLocalScratchDir(!explain);
}
try {
Path dir = FileUtils.makeQualified(nonLocalScratchPath, conf);
URI uri = dir.toUri();
return getScratchDir(uri.getScheme(), uri.getAuthority(),
!explain, uri.getPath());
} catch (IOException e) {
throw new RuntimeException(e);
} catch (IllegalArgumentException e) {
throw new RuntimeException("Error while making MR scratch "
+ "directory - check filesystem config (" + e.getCause() + ")", e);
}
}
private String getExternalScratchDir(URI extURI) {
return getScratchDir(extURI.getScheme(), extURI.getAuthority(),
!explain, nonLocalScratchPath.toUri().getPath());
}
/**
* Remove any created scratch directories.
*/
private void removeScratchDir() {
for (Map.Entry<String, String> entry : fsScratchDirs.entrySet()) {
try {
Path p = new Path(entry.getValue());
p.getFileSystem(conf).delete(p, true);
} catch (Exception e) {
LOG.warn("Error Removing Scratch: "
+ StringUtils.stringifyException(e));
}
}
fsScratchDirs.clear();
}
private String nextPathId() {
return Integer.toString(pathid++);
}
private static final String MR_PREFIX = "-mr-";
private static final String EXT_PREFIX = "-ext-";
private static final String LOCAL_PREFIX = "-local-";
/**
* Check if path is for intermediate data
* @return true if a uri is a temporary uri for map-reduce intermediate data,
* false otherwise
*/
public boolean isMRTmpFileURI(String uriStr) {
return (uriStr.indexOf(executionId) != -1) &&
(uriStr.indexOf(MR_PREFIX) != -1);
}
/**
* Get a path to store map-reduce intermediate data in.
*
* @return next available path for map-red intermediate data
*/
public String getMRTmpFileURI() {
return getMRScratchDir() + Path.SEPARATOR + MR_PREFIX +
nextPathId();
}
/**
* Given a URI for mapreduce intermediate output, swizzle the
* it to point to the local file system. This can be called in
* case the caller decides to run in local mode (in which case
* all intermediate data can be stored locally)
*
* @param originalURI uri to localize
* @return localized path for map-red intermediate data
*/
public String localizeMRTmpFileURI(String originalURI) {
Path o = new Path(originalURI);
Path mrbase = new Path(getMRScratchDir());
URI relURI = mrbase.toUri().relativize(o.toUri());
if (relURI.equals(o.toUri())) {
throw new RuntimeException
("Invalid URI: " + originalURI + ", cannot relativize against" +
mrbase.toString());
}
return getLocalScratchDir(!explain) + Path.SEPARATOR +
relURI.getPath();
}
/**
* Get a tmp path on local host to store intermediate data.
*
* @return next available tmp path on local fs
*/
public String getLocalTmpFileURI() {
return getLocalScratchDir(true) + Path.SEPARATOR + LOCAL_PREFIX +
nextPathId();
}
/**
* Get a path to store tmp data destined for external URI.
*
* @param extURI
* external URI to which the tmp data has to be eventually moved
* @return next available tmp path on the file system corresponding extURI
*/
public String getExternalTmpFileURI(URI extURI) {
return getExternalScratchDir(extURI) + Path.SEPARATOR + EXT_PREFIX +
nextPathId();
}
/**
* @return the resFile
*/
public Path getResFile() {
return resFile;
}
/**
* @param resFile
* the resFile to set
*/
public void setResFile(Path resFile) {
this.resFile = resFile;
resDir = null;
resDirPaths = null;
resDirFilesNum = 0;
}
/**
* @return the resDir
*/
public Path getResDir() {
return resDir;
}
/**
* @param resDir
* the resDir to set
*/
public void setResDir(Path resDir) {
this.resDir = resDir;
resFile = null;
resDirFilesNum = 0;
resDirPaths = null;
}
public void clear() throws IOException {
if (resDir != null) {
try {
FileSystem fs = resDir.getFileSystem(conf);
fs.delete(resDir, true);
} catch (IOException e) {
LOG.info("Context clear error: " + StringUtils.stringifyException(e));
}
}
if (resFile != null) {
try {
FileSystem fs = resFile.getFileSystem(conf);
fs.delete(resFile, false);
} catch (IOException e) {
LOG.info("Context clear error: " + StringUtils.stringifyException(e));
}
}
removeScratchDir();
originalTracker = null;
setNeedLockMgr(false);
}
public DataInput getStream() {
try {
if (!initialized) {
initialized = true;
if ((resFile == null) && (resDir == null)) {
return null;
}
if (resFile != null) {
return resFile.getFileSystem(conf).open(resFile);
}
resFs = resDir.getFileSystem(conf);
FileStatus status = resFs.getFileStatus(resDir);
assert status.isDir();
FileStatus[] resDirFS = resFs.globStatus(new Path(resDir + "/*"));
resDirPaths = new Path[resDirFS.length];
int pos = 0;
for (FileStatus resFS : resDirFS) {
if (!resFS.isDir()) {
resDirPaths[pos++] = resFS.getPath();
}
}
if (pos == 0) {
return null;
}
return resFs.open(resDirPaths[resDirFilesNum++]);
} else {
return getNextStream();
}
} catch (FileNotFoundException e) {
LOG.info("getStream error: " + StringUtils.stringifyException(e));
return null;
} catch (IOException e) {
LOG.info("getStream error: " + StringUtils.stringifyException(e));
return null;
}
}
private DataInput getNextStream() {
try {
if (resDir != null && resDirFilesNum < resDirPaths.length
&& (resDirPaths[resDirFilesNum] != null)) {
return resFs.open(resDirPaths[resDirFilesNum++]);
}
} catch (FileNotFoundException e) {
LOG.info("getNextStream error: " + StringUtils.stringifyException(e));
return null;
} catch (IOException e) {
LOG.info("getNextStream error: " + StringUtils.stringifyException(e));
return null;
}
return null;
}
/**
* Little abbreviation for StringUtils.
*/
private static boolean strEquals(String str1, String str2) {
return org.apache.commons.lang.StringUtils.equals(str1, str2);
}
/**
* Set the token rewrite stream being used to parse the current top-level SQL
* statement. Note that this should <b>not</b> be used for other parsing
* activities; for example, when we encounter a reference to a view, we switch
* to a new stream for parsing the stored view definition from the catalog,
* but we don't clobber the top-level stream in the context.
*
* @param tokenRewriteStream
* the stream being used
*/
public void setTokenRewriteStream(TokenRewriteStream tokenRewriteStream) {
assert (this.tokenRewriteStream == null);
this.tokenRewriteStream = tokenRewriteStream;
}
/**
* @return the token rewrite stream being used to parse the current top-level
* SQL statement, or null if it isn't available (e.g. for parser
* tests)
*/
public TokenRewriteStream getTokenRewriteStream() {
return tokenRewriteStream;
}
/**
* Generate a unique executionId. An executionId, together with user name and
* the configuration, will determine the temporary locations of all intermediate
* files.
*
* In the future, users can use the executionId to resume a query.
*/
public static String generateExecutionId() {
Random rand = new Random();
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss_SSS");
String executionId = "hive_" + format.format(new Date()) + "_"
+ Math.abs(rand.nextLong());
return executionId;
}
/**
* Does Hive wants to run tasks entirely on the local machine
* (where the query is being compiled)?
*
* Today this translates into running hadoop jobs locally
*/
public boolean isLocalOnlyExecutionMode() {
return ShimLoader.getHadoopShims().isLocalMode(conf);
}
public List<HiveLock> getHiveLocks() {
return hiveLocks;
}
public void setHiveLocks(List<HiveLock> hiveLocks) {
this.hiveLocks = hiveLocks;
}
public HiveLockManager getHiveLockMgr() {
if (hiveLockMgr != null) {
hiveLockMgr.refresh();
}
return hiveLockMgr;
}
public void setHiveLockMgr(HiveLockManager hiveLockMgr) {
this.hiveLockMgr = hiveLockMgr;
}
public void setOriginalTracker(String originalTracker) {
this.originalTracker = originalTracker;
}
public void restoreOriginalTracker() {
if (originalTracker != null) {
ShimLoader.getHadoopShims().setJobLauncherRpcAddress(conf, originalTracker);
originalTracker = null;
}
}
public void addCS(String path, ContentSummary cs) {
pathToCS.put(path, cs);
}
public ContentSummary getCS(String path) {
return pathToCS.get(path);
}
public Map<String, ContentSummary> getPathToCS() {
return pathToCS;
}
public Configuration getConf() {
return conf;
}
/**
* Given a mapping from paths to objects, localize any MR tmp paths
* @param map mapping from paths to objects
*/
public void localizeKeys(Map<String, Object> map) {
for (Map.Entry<String, Object> entry: map.entrySet()) {
String path = entry.getKey();
if (isMRTmpFileURI(path)) {
Object val = entry.getValue();
map.remove(path);
map.put(localizeMRTmpFileURI(path), val);
}
}
}
/**
* Given a list of paths, localize any MR tmp paths contained therein
* @param paths list of paths to be localized
*/
public void localizePaths(List<String> paths) {
Iterator<String> iter = paths.iterator();
List<String> toAdd = new ArrayList<String> ();
while(iter.hasNext()) {
String path = iter.next();
if (isMRTmpFileURI(path)) {
iter.remove();
toAdd.add(localizeMRTmpFileURI(path));
}
}
paths.addAll(toAdd);
}
public boolean isNeedLockMgr() {
return needLockMgr;
}
public void setNeedLockMgr(boolean needLockMgr) {
this.needLockMgr = needLockMgr;
}
public int getTryCount() {
return tryCount;
}
public void setTryCount(int tryCount) {
this.tryCount = tryCount;
}
}