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HDFS-3539. libhdfs code cleanups. Contributed by Colin Patrick McCabe 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1361459 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Eli Collins 2012-07-14 00:47:43 +00:00
parent cfd692b866
commit f5dd4583bb
13 changed files with 200 additions and 90 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -322,6 +322,8 @@ Branch-2 ( Unreleased changes )
HDFS-3606. libhdfs: create self-contained unit test.
(Colin Patrick McCabe via eli)
HDFS-3539. libhdfs code cleanups. (Colin Patrick McCabe via eli)
OPTIMIZATIONS
HDFS-2982. Startup performance suffers when there are many edit log

2
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_connect.c
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@ -23,6 +23,8 @@
#include <limits.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#define HADOOP_SECURITY_AUTHENTICATION "hadoop.security.authentication"

3
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_dfs.c
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@ -22,6 +22,9 @@
#include "fuse_init.h"
#include "fuse_connect.h"
#include <string.h>
#include <stdlib.h>
int is_protected(const char *path) {
dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;

4
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_impls_chown.c
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@ -21,7 +21,9 @@
#include "fuse_impls.h"
#include "fuse_connect.h"
int dfs_chown(const char *path, uid_t uid, gid_t gid)
#include <stdlib.h>
int dfs_chown(const char *path, uid_t uid, gid_t gid)
{
TRACE1("chown", path)

2
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_impls_release.c
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@ -21,6 +21,8 @@
#include "fuse_file_handle.h"
#include "fuse_connect.h"
#include <stdlib.h>
/**
* release a fuse_file_info structure.
*

6
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_init.c
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@ -16,14 +16,16 @@
* limitations under the License.
*/
#include <strings.h>
#include "fuse_dfs.h"
#include "fuse_init.h"
#include "fuse_options.h"
#include "fuse_context_handle.h"
#include "fuse_connect.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Hacked up function to basically do:
// protectedpaths = split(options.protected,':');

5
hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_options.c
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@ -16,11 +16,12 @@
* limitations under the License.
*/
#include "fuse_context_handle.h"
#include "fuse_dfs.h"
#include "fuse_options.h"
#include <getopt.h>
#include "fuse_context_handle.h"
#include <getopt.h>
#include <stdlib.h>
void print_options() {
printf("options:\n"

48
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.c
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@ -19,6 +19,8 @@
#include "hdfs.h"
#include "hdfsJniHelper.h"
#include <stdio.h>
#include <string.h>
/* Some frequently used Java paths */
#define HADOOP_CONF "org/apache/hadoop/conf/Configuration"
@ -47,6 +49,50 @@
#define KERBEROS_TICKET_CACHE_PATH "hadoop.security.kerberos.ticket.cache.path"
// Bit fields for hdfsFile_internal flags
#define HDFS_FILE_SUPPORTS_DIRECT_READ (1<<0)
tSize readDirect(hdfsFS fs, hdfsFile f, void* buffer, tSize length);
/**
* The C equivalent of org.apache.org.hadoop.FSData(Input|Output)Stream .
*/
enum hdfsStreamType
{
UNINITIALIZED = 0,
INPUT = 1,
OUTPUT = 2,
};
/**
* The 'file-handle' to a file in hdfs.
*/
struct hdfsFile_internal {
void* file;
enum hdfsStreamType type;
int flags;
};
int hdfsFileIsOpenForRead(hdfsFile file)
{
return (file->type == INPUT);
}
int hdfsFileIsOpenForWrite(hdfsFile file)
{
return (file->type == OUTPUT);
}
int hdfsFileUsesDirectRead(hdfsFile file)
{
return !!(file->flags & HDFS_FILE_SUPPORTS_DIRECT_READ);
}
void hdfsFileDisableDirectRead(hdfsFile file)
{
file->flags &= ~HDFS_FILE_SUPPORTS_DIRECT_READ;
}
/**
* hdfsJniEnv: A wrapper struct to be used as 'value'
* while saving thread -> JNIEnv* mappings
@ -2182,7 +2228,7 @@ getFileInfoFromStat(JNIEnv *env, jobject jStat, hdfsFileInfo *fileInfo)
"FileStatus::getModificationTime");
return -1;
}
fileInfo->mLastMod = (tTime) (jVal.j / 1000);
fileInfo->mLastMod = jVal.j / 1000;
if (invokeMethod(env, &jVal, &jExc, INSTANCE, jStat,
HADOOP_STAT, "getAccessTime", "()J") != 0) {

70
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs.h
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@ -19,18 +19,10 @@
#ifndef LIBHDFS_HDFS_H
#define LIBHDFS_HDFS_H
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <jni.h>
#include <errno.h> /* for EINTERNAL, etc. */
#include <fcntl.h> /* for O_RDONLY, O_WRONLY */
#include <stdint.h> /* for uint64_t, etc. */
#include <time.h> /* for time_t */
#ifndef O_RDONLY
#define O_RDONLY 1
@ -46,10 +38,10 @@
/** All APIs set errno to meaningful values */
#ifdef __cplusplus
extern "C" {
#endif
/**
* Some utility decls used in libhdfs.
*/
@ -67,33 +59,37 @@ extern "C" {
/**
* The C reflection of org.apache.org.hadoop.FileSystem .
*/
typedef void* hdfsFS;
struct hdfs_internal;
typedef struct hdfs_internal* hdfsFS;
/**
* The C equivalent of org.apache.org.hadoop.FSData(Input|Output)Stream .
*/
enum hdfsStreamType
{
UNINITIALIZED = 0,
INPUT = 1,
OUTPUT = 2,
};
// Bit fields for hdfsFile_internal flags
#define HDFS_FILE_SUPPORTS_DIRECT_READ (1<<0)
/**
* The 'file-handle' to a file in hdfs.
*/
struct hdfsFile_internal {
void* file;
enum hdfsStreamType type;
uint32_t flags;
};
struct hdfsFile_internal;
typedef struct hdfsFile_internal* hdfsFile;
/**
* Determine if a file is open for read.
*
* @param file The HDFS file
* @return 1 if the file is open for read; 0 otherwise
*/
int hdfsFileIsOpenForRead(hdfsFile file);
/**
* Determine if a file is open for write.
*
* @param file The HDFS file
* @return 1 if the file is open for write; 0 otherwise
*/
int hdfsFileIsOpenForWrite(hdfsFile file);
/**
* Disable the direct read optimization for a file.
*
* This is mainly provided for unit testing purposes.
*
* @param file The HDFS file
*/
void hdfsFileDisableDirectRead(hdfsFile file);
/**
* hdfsConnectAsUser - Connect to a hdfs file system as a specific user
* Connect to the hdfs.

3
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_read.c
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@ -18,6 +18,9 @@
#include "hdfs.h"
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 4) {

91
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.c
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@ -17,8 +17,15 @@
*/
#include "hdfs.h"
#include "hdfs_test.h"
tSize readDirect(hdfsFS fs, hdfsFile f, void* buffer, tSize length);
#include <inttypes.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
void permission_disp(short permissions, char *rtr) {
rtr[9] = '\0';
@ -53,6 +60,9 @@ void permission_disp(short permissions, char *rtr) {
}
int main(int argc, char **argv) {
char buffer[32];
tSize num_written_bytes;
hdfsFS fs = hdfsConnectNewInstance("default", 0);
if(!fs) {
fprintf(stderr, "Oops! Failed to connect to hdfs!\n");
@ -77,7 +87,7 @@ int main(int argc, char **argv) {
exit(-1);
}
fprintf(stderr, "Opened %s for writing successfully...\n", writePath);
tSize num_written_bytes =
num_written_bytes =
hdfsWrite(fs, writeFile, (void*)fileContents, strlen(fileContents)+1);
if (num_written_bytes != strlen(fileContents) + 1) {
fprintf(stderr, "Failed to write correct number of bytes - expected %d, got %d\n",
@ -127,6 +137,13 @@ int main(int argc, char **argv) {
exit(-1);
}
if (!hdfsFileIsOpenForRead(readFile)) {
fprintf(stderr, "hdfsFileIsOpenForRead: we just opened a file "
"with O_RDONLY, and it did not show up as 'open for "
"read'\n");
exit(-1);
}
fprintf(stderr, "hdfsAvailable: %d\n", hdfsAvailable(fs, readFile));
tOffset seekPos = 1;
@ -144,7 +161,7 @@ int main(int argc, char **argv) {
}
fprintf(stderr, "Current position: %ld\n", currentPos);
if ((readFile->flags & HDFS_FILE_SUPPORTS_DIRECT_READ) == 0) {
if (!hdfsFileUsesDirectRead(readFile)) {
fprintf(stderr, "Direct read support incorrectly not detected "
"for HDFS filesystem\n");
exit(-1);
@ -152,12 +169,32 @@ int main(int argc, char **argv) {
fprintf(stderr, "Direct read support detected for HDFS\n");
// Clear flags so that we really go through slow read path
readFile->flags &= ~HDFS_FILE_SUPPORTS_DIRECT_READ;
static char buffer[32];
// Test the direct read path
if(hdfsSeek(fs, readFile, 0)) {
fprintf(stderr, "Failed to seek %s for reading!\n", readPath);
exit(-1);
}
memset(buffer, 0, sizeof(buffer));
tSize num_read_bytes = hdfsRead(fs, readFile, (void*)buffer,
sizeof(buffer));
if (strncmp(fileContents, buffer, strlen(fileContents)) != 0) {
fprintf(stderr, "Failed to read (direct). Expected %s but got %s (%d bytes)\n",
fileContents, buffer, num_read_bytes);
exit(-1);
}
fprintf(stderr, "Read (direct) following %d bytes:\n%s\n",
num_read_bytes, buffer);
if (hdfsSeek(fs, readFile, 0L)) {
fprintf(stderr, "Failed to seek to file start!\n");
exit(-1);
}
// Disable the direct read path so that we really go through the slow
// read path
hdfsFileDisableDirectRead(readFile);
num_read_bytes = hdfsRead(fs, readFile, (void*)buffer,
sizeof(buffer));
fprintf(stderr, "Read following %d bytes:\n%s\n",
num_read_bytes, buffer);
@ -168,24 +205,6 @@ int main(int argc, char **argv) {
fprintf(stderr, "Read following %d bytes:\n%s\n",
num_read_bytes, buffer);
if (hdfsSeek(fs, readFile, 0L)) {
fprintf(stderr,
"Failed to seek to file start for direct read test!\n");
exit(-1);
}
readFile->flags |= HDFS_FILE_SUPPORTS_DIRECT_READ;
memset(buffer, 0, strlen(fileContents + 1));
num_read_bytes = hdfsRead(fs, readFile, (void*)buffer,
sizeof(buffer));
if (strncmp(fileContents, buffer, strlen(fileContents)) != 0) {
fprintf(stderr, "Failed to read (direct). Expected %s but got %s (%d bytes)\n",
fileContents, buffer, num_read_bytes);
exit(-1);
}
fprintf(stderr, "Read (direct) following %d bytes:\n%s\n",
num_read_bytes, buffer);
hdfsCloseFile(fs, readFile);
// Test correct behaviour for unsupported filesystems
@ -195,34 +214,18 @@ int main(int argc, char **argv) {
exit(-1);
}
tSize num_written_bytes = hdfsWrite(lfs, localFile,
(void*)fileContents,
strlen(fileContents) + 1);
num_written_bytes = hdfsWrite(lfs, localFile, (void*)fileContents,
strlen(fileContents) + 1);
hdfsCloseFile(lfs, localFile);
localFile = hdfsOpenFile(lfs, writePath, O_RDONLY, 0, 0, 0);
if (localFile->flags & HDFS_FILE_SUPPORTS_DIRECT_READ) {
if (hdfsFileUsesDirectRead(localFile)) {
fprintf(stderr, "Direct read support incorrectly detected for local "
"filesystem\n");
exit(-1);
}
memset(buffer, 0, strlen(fileContents + 1));
int result = readDirect(lfs, localFile, (void*)buffer, sizeof(buffer));
if (result != -1) {
fprintf(stderr, "Expected error from local direct read not seen!\n");
exit(-1);
}
if (errno != ENOTSUP) {
fprintf(stderr, "Error code not correctly set to ENOTSUP, was %d!\n",
errno);
exit(-1);
}
fprintf(stderr, "Expected exception thrown for unsupported direct read\n");
hdfsCloseFile(lfs, localFile);
}

46
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_test.h Normal file
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@ -0,0 +1,46 @@
/**
* 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.
*/
#ifndef LIBHDFS_HDFS_TEST_H
#define LIBHDFS_HDFS_TEST_H
struct hdfs_internal;
/**
* Some functions that are visible only for testing.
*
* This header is not meant to be exported or used outside of the libhdfs unit
* tests.
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* Determine if a file is using the "direct read" optimization.
*
* @param file The HDFS file
* @return 1 if the file is using the direct read optimization,
* 0 otherwise.
*/
int hdfsFileUsesDirectRead(struct hdfs_internal *file);
#ifdef __cplusplus
}
#endif
#endif

6
hadoop-hdfs-project/hadoop-hdfs/src/main/native/hdfs_write.c
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@ -16,10 +16,12 @@
* limitations under the License.
*/
#include <limits.h>
#include "hdfs.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 4) {