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From "Musaddique Hossain (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13991) Retry management in NativeS3FileSystem to avoid file upload problem
Date Sat, 14 Jan 2017 18:42:26 GMT
Musaddique Hossain created HADOOP-13991:
-------------------------------------------

             Summary: Retry management in NativeS3FileSystem to avoid file upload problem
                 Key: HADOOP-13991
                 URL: https://issues.apache.org/jira/browse/HADOOP-13991
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs/s3
    Affects Versions: 2.7.3
            Reporter: Musaddique Hossain
            Priority: Minor


NativeS3FileSystem does not support any retry management for failed uploading to S3.

If due to socket timeout or any other network exception, file uploading to S3 bucket fails,
then uploading fails and temporary file gets deleted.

This can be solved by using asynchronous retry management.

We have made following modifications to NativeS3FileSystem to add the retry management, which
is working fine in our product system, without any uploading failure:

@@ -36,6 +36,7 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;

 import com.google.common.base.Preconditions;
@@ -279,9 +280,19 @@
       backupStream.close();
       LOG.info("OutputStream for key '{}' closed. Now beginning upload", key);

+      Callable<Void> task = new Callable<Void>() {
+         private final byte[] md5Hash = digest == null ? null : digest.digest();
+         public Void call() throws IOException {
+            store.storeFile(key, backupFile, md5Hash);
+            return null;
+         }
+      };
+      RetriableTask<Void> r = new RetriableTask<Void>(task);
+      
       try {
-        byte[] md5Hash = digest == null ? null : digest.digest();
-        store.storeFile(key, backupFile, md5Hash);
+         r.call();
+      } catch (Exception e) {
+         throw new IOException(e);
       } finally {
         if (!backupFile.delete()) {
           LOG.warn("Could not delete temporary s3n file: " + backupFile);




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