我正在尝试使用Python的拼花模块来读取从本地MapR实例编写的一些Parquet文件。
我用来输出这些镶木地板文件的命令是：
df.sqlContext.sql("SQL HERE").write.format("parquet").option("mergeSchema", "true").save("/path/to/parquet/test.parquet")
这是我的Linux主机上的文件：
drwxr-xr-x 2 mapr mapr 403 Oct 5 13:56 igayfvpwrs.parquet
不幸的是，当我在这里使用Python（https://pypi.python.org/pypi/parquet）时 - 我收到以下异常：
IOError: [Errno 21] Is a directory: '/mnt/mapr/saw/user/mapr/igayfvpwrs.parquet'
有什么想法吗？这些文件在MapR中运行良好。
编辑2：
我能够弄清楚。自从原始.parquet＆＃34;文件＆＃34;是一个目录，只需循环遍历所有内部.parquet文件的glob目录 - Python-parquet的原始代码在那里工作。
for filename in glob.glob("/mnt/mapr/saw/user/mapr/{0}.parquet/*.parquet".format(tempTableID)):
with open(filename) as foo:
for row in parquet.DictReader(foo, columns=["column"]):
print(json.dumps(row))
编辑： 以下是镶木地板文件中的内容：
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 _common_metadata
-rwxr-xr-x 1 mapr mapr 2.4K Oct 5 13:58 _metadata
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00000-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00001-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00002-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00003-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00004-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00005-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00006-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00007-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00008-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00009-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00010-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00011-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00012-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00013-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00014-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00015-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00016-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00017-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00018-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00019-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00020-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00021-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00022-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00023-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00024-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00025-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00026-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00027-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00028-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00029-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00030-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00031-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00032-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00033-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00034-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00035-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00036-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00037-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00038-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00039-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00040-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00041-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00042-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00043-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00044-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00045-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00046-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00047-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00048-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00049-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00050-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00051-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00052-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 1.2K Oct 5 13:58 part-r-00053-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00054-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00055-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00056-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00057-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00058-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00059-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00060-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00061-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00062-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00063-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00064-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00065-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00066-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00067-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00068-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00069-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00070-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00071-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00072-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00073-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00074-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00075-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00076-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00077-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00078-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00079-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00080-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00081-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00082-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00083-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00084-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00085-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00086-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00087-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00088-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00089-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00090-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00091-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00092-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00093-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00094-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00095-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00096-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00097-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00098-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00099-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00100-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00101-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00102-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00103-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00104-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 1.2K Oct 5 13:58 part-r-00105-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00106-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00107-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00108-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
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-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00124-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 1.2K Oct 5 13:58 part-r-00125-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00126-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00127-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00128-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
-rwxr-xr-x 1 mapr mapr 514 Oct 5 13:58 part-r-00129-02f0b80b-2993-46f8-a191-f111c6db1dad.gz.parquet
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[truncated]
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答案 0 :(得分：1)
这里的镶木地板没有问题。 DataFrameWriter将镶木地板格式写入目录，并根据正在编写的DataFrame的分区数对输出进行分区。
你得到的是绝对正常的。
答案 1 :(得分：0)
根据ls命令的输出，它看起来像igayfvpwrs.parquet实际上是一个目录。你能检查一下里面的数据吗？