HDFS-4155. libhdfs implementation of hsync API. Contributed by Liang Xie.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1406373 13f79535-47bb-0310-9956-ffa450edef68
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@ -17,6 +17,8 @@ Release 2.0.3-alpha - Unreleased
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HDFS-4059. Add number of stale DataNodes to metrics. (Jing Zhao via suresh)
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HDFS-4155. libhdfs implementation of hsync API (Liang Xie via todd)
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IMPROVEMENTS
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HDFS-3925. Prettify PipelineAck#toString() for printing to a log
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@ -1388,6 +1388,32 @@ int hdfsHFlush(hdfsFS fs, hdfsFile f)
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return 0;
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}
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int hdfsHSync(hdfsFS fs, hdfsFile f)
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{
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//Get the JNIEnv* corresponding to current thread
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JNIEnv* env = getJNIEnv();
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if (env == NULL) {
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errno = EINTERNAL;
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return -1;
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}
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//Sanity check
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if (!f || f->type != OUTPUT) {
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errno = EBADF;
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return -1;
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}
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jobject jOutputStream = f->file;
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jthrowable jthr = invokeMethod(env, NULL, INSTANCE, jOutputStream,
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HADOOP_OSTRM, "hsync", "()V");
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if (jthr) {
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errno = printExceptionAndFree(env, jthr, PRINT_EXC_ALL,
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"hdfsHSync: FSDataOutputStream#hsync");
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return -1;
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}
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return 0;
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}
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int hdfsAvailable(hdfsFS fs, hdfsFile f)
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{
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// JAVA EQUIVALENT
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@ -393,6 +393,17 @@ extern "C" {
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int hdfsHFlush(hdfsFS fs, hdfsFile file);
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/**
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* hdfsHSync - Similar to posix fsync, Flush out the data in client's
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* user buffer. all the way to the disk device (but the disk may have
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* it in its cache).
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* @param fs configured filesystem handle
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* @param file file handle
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* @return 0 on success, -1 on error and sets errno
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*/
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int hdfsHSync(hdfsFS fs, hdfsFile file);
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/**
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* hdfsAvailable - Number of bytes that can be read from this
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* input stream without blocking.
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@ -150,6 +150,7 @@ static int doTestHdfsOperations(struct tlhThreadInfo *ti, hdfsFS fs)
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return EIO;
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}
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EXPECT_ZERO(hdfsFlush(fs, file));
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EXPECT_ZERO(hdfsHSync(fs, file));
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EXPECT_ZERO(hdfsCloseFile(fs, file));
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/* Let's re-open the file for reading */
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