HADOOP-13491. Fix several warnings from findbugs. Contributed by Genmao Yu.

hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSFileSystem.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.fs.aliyun.oss;
 
 import static org.apache.hadoop.fs.aliyun.oss.Constants.*;
 
+import com.aliyun.oss.ClientException;
 import com.aliyun.oss.common.auth.CredentialsProvider;
 import com.aliyun.oss.common.auth.DefaultCredentialProvider;
 import com.aliyun.oss.common.auth.DefaultCredentials;
@@ -782,7 +783,7 @@ public class AliyunOSSFileSystem extends FileSystem {
           ossClient.completeMultipartUpload(completeMultipartUploadRequest);
       LOG.debug(completeMultipartUploadResult.getETag());
       return true;
-    } catch (Exception e) {
+    } catch (OSSException | ClientException e) {
       AbortMultipartUploadRequest abortMultipartUploadRequest =
           new AbortMultipartUploadRequest(bucketName, dstKey, uploadId);
       ossClient.abortMultipartUpload(abortMultipartUploadRequest);

hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSInputStream.java

@@ -227,12 +227,12 @@ public class AliyunOSSInputStream extends FSInputStream {
   }
 
   @Override
-  public void seek(long pos) throws IOException {
+  public synchronized void seek(long pos) throws IOException {
     checkNotClosed();
     if (position == pos) {
       return;
     } else if (pos > position && pos < position + partRemaining) {
-      wrappedStream.skip(pos - position);
+      AliyunOSSUtils.skipFully(wrappedStream, pos - position);
       position = pos;
     } else {
       reopen(pos);
@@ -240,7 +240,7 @@ public class AliyunOSSInputStream extends FSInputStream {
   }
 
   @Override
-  public long getPos() throws IOException {
+  public synchronized long getPos() throws IOException {
     checkNotClosed();
     return position;
   }

hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSOutputStream.java

@@ -29,6 +29,8 @@ import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.aliyun.oss.ClientException;
+import com.aliyun.oss.OSSException;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -113,7 +115,9 @@ public class AliyunOSSOutputStream extends OutputStream {
         multipartUploadObject();
       }
     } finally {
-      tmpFile.delete();
+      if (!tmpFile.delete()) {
+        LOG.warn("Can not delete file: " + tmpFile);
+      }
     }
   }
 
@@ -174,7 +178,7 @@ public class AliyunOSSOutputStream extends OutputStream {
         FileInputStream fis = new FileInputStream(object);
         try {
           long skipBytes = partSize * i;
-          fis.skip(skipBytes);
+          AliyunOSSUtils.skipFully(fis, skipBytes);
           long size = (partSize < dataLen - skipBytes) ?
               partSize : dataLen - skipBytes;
           UploadPartRequest uploadPartRequest = new UploadPartRequest();
@@ -198,7 +202,7 @@ public class AliyunOSSOutputStream extends OutputStream {
       CompleteMultipartUploadResult completeMultipartUploadResult =
           ossClient.completeMultipartUpload(completeMultipartUploadRequest);
       LOG.debug(completeMultipartUploadResult.getETag());
-    } catch (Exception e) {
+    } catch (OSSException | ClientException e) {
       AbortMultipartUploadRequest abortMultipartUploadRequest =
           new AbortMultipartUploadRequest(bucketName, key, uploadId);
       ossClient.abortMultipartUpload(abortMultipartUploadRequest);

hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSUtils.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.fs.aliyun.oss;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
 import java.net.URI;
 import java.net.URLDecoder;
@@ -116,7 +117,7 @@ final public class AliyunOSSUtils {
 
   /**
    * Extract the user information details from a URI.
-   * @param name URI of the filesystem
+   * @param name URI of the filesystem.
    * @return a login tuple, possibly empty.
    */
   public static UserInfo extractLoginDetails(URI name) {
@@ -148,4 +149,27 @@ final public class AliyunOSSUtils {
       throw new RuntimeException(e);
     }
   }
+
+  /**
+   * Skips the requested number of bytes or fail if there are not enough left.
+   * This allows for the possibility that {@link InputStream#skip(long)} may not
+   * skip as many bytes as requested (most likely because of reaching EOF).
+   * @param is the input stream to skip.
+   * @param n the number of bytes to skip.
+   * @throws IOException thrown when skipped less number of bytes.
+   */
+  public static void skipFully(InputStream is, long n) throws IOException {
+    long total = 0;
+    long cur = 0;
+
+    do {
+      cur = is.skip(n - total);
+      total += cur;
+    } while((total < n) && (cur > 0));
+
+    if (total < n) {
+      throw new IOException("Failed to skip " + n + " bytes, possibly due " +
+              "to EOF.");
+    }
+  }
 }