[jira] [Created] (HDFS-10177) a wrong number of the bytes read are copied into native buffer in hdfsRead()

["Yongtao Yang (JIRA)" <ji...@apache.org>]

Yongtao Yang created HDFS-10177:
-----------------------------------

             Summary: a wrong number of the bytes read are copied into native buffer in hdfsRead()
                 Key: HDFS-10177
                 URL: https://issues.apache.org/jira/browse/HDFS-10177
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: libhdfs
    Affects Versions: 2.6.4, 2.6.3, 2.6.2, 2.7.2, 2.6.0
         Environment: RHEL 6.3, 64-bit
Oralce JDK 1.7.0_55
            Reporter: Yongtao Yang


in the implementation of {{hdfsRead()}}，
<code>
tSize hdfsRead(hdfsFS fs, hdfsFile f, void* buffer, tSize length)
{
......
jint noReadBytes = length;
......
    jthr = invokeMethod(env, &jVal, INSTANCE, jInputStream, HADOOP_ISTRM,
                               "read", "([B)I", jbRarray);
    if (jthr) {
        destroyLocalReference(env, jbRarray);
        errno = printExceptionAndFree(env, jthr, PRINT_EXC_ALL,
            "hdfsRead: FSDataInputStream#read");
        return -1;
    }
    if (jVal.i < 0) {
        // EOF
        destroyLocalReference(env, jbRarray);
        return 0;
    } else if (jVal.i == 0) {
        destroyLocalReference(env, jbRarray);
        errno = EINTR;
        return -1;
    }
    (*env)->GetByteArrayRegion(env, jbRarray, 0, noReadBytes, buffer);
</code>
{{noReadBytes}} is initialized to {{length}}, but it should be set {{jav.i}} before the bytes are copied to the native {{buffer}}.



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