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HDFS-14285. libhdfs hdfsRead copies entire array even if its only partially filled. Contributed by Sahil Takiar. 

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
This commit is contained in:
Sahil Takiar 2019-02-22 17:53:50 -08:00 committed by Wei-Chiu Chuang
parent 9daf43c6fa
commit f19c844e75
1 changed files with 6 additions and 2 deletions
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8
hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/hdfs.c
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@ -1396,7 +1396,6 @@ tSize hdfsRead(hdfsFS fs, hdfsFile f, void* buffer, tSize length)
{
jobject jInputStream;
jbyteArray jbRarray;
jint noReadBytes = length;
jvalue jVal;
jthrowable jthr;
JNIEnv* env;
@ -1452,7 +1451,12 @@ tSize hdfsRead(hdfsFS fs, hdfsFile f, void* buffer, tSize length)
errno = EINTR;
return -1;
}
(*env)->GetByteArrayRegion(env, jbRarray, 0, noReadBytes, buffer);
// We only copy the portion of the jbRarray that was actually filled by
// the call to FsDataInputStream#read; #read is not guaranteed to fill the
// entire buffer, instead it returns the number of bytes read into the
// buffer; we use the return value as the input in GetByteArrayRegion to
// ensure don't copy more bytes than necessary
(*env)->GetByteArrayRegion(env, jbRarray, 0, jVal.i, buffer);
destroyLocalReference(env, jbRarray);
if ((*env)->ExceptionCheck(env)) {
errno = printPendingExceptionAndFree(env, PRINT_EXC_ALL,