Kaifeng Xue created IOTDB-206:
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Summary: IOTDB spark jdbc connector
Key: IOTDB-206
URL: https://issues.apache.org/jira/browse/IOTDB-206
Project: Apache IoTDB
Issue Type: New Feature
Jialin Qiao created IOTDB-205:
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Summary: Support retention policy
Key: IOTDB-205
URL: https://issues.apache.org/jira/browse/IOTDB-205
Project: Apache IoTDB
Issue Type: New Feature
In fact, I am working on the hadoop-connector, so I should create a HDFSInput
that implements TsFileInput interface for reading tsfile from HDFS.
And actually, in DefaultTsFileInput, this method is unsupported which you can
see in the following.
@Override
public int read(byte[] b, int off, int
Hi, tian
DefaultTsFileInput is a class to implement TsFileInput
interface. DefaultTsFileInput's method read actually change the position of
itself because it uses java.io.FileChannel, and we can use a "position"
method to change its position back. But I'm also confusing that why can't
change the
Hi, Boris
If the position is not specified, I think the position should be modified.
There are two methods in TsFileInput interface that don’t have position
parameter in their function signature.
1.
int read(ByteBuffer dst) throws IOException;
2.
int read() throws IOException;
Actually, in
I check-in java doc and it says the file position is updated with the
number of bytes actually read. You can see below
* Reads a sequence of bytes from this channel into the given buffer.
*
* Bytes are read starting at this channel's current file position, and
* then the file position is
Hi,
While implementing one read method(shown in the following) in TsFileInput
interface, I don’t know whether to modify the position of TsFileInput.
/**
* read an array of byte from the Input.
*
* @param b -array of byte
* @param off -offset of the Input
* @param len -length
*/
int
I agree with you that shouldn’t modify the position of TsFileInput when
having already specified the position. Sorry for the misunderstanding. But
if not specified, should it be changed for hdfs or local?
Best,
Boris zhu
On Mon, Sep 9, 2019 at 11:35 PM Yuan Tian wrote:
> In fact, I am working
Hi, Boris
Yes, like what I said, the method without position signature acts like the
inputStream that you can’t manually change the position where you want to read.
Instead, you can only read by order. The position will automatically move
forward while you read data from the stream.
Best,
Hi,
- `TsFileInput.read(ByteBuffer dst, long position)` does not modify this
TsFileInput's position.
It works just as the annotation depicts.
If you do a simple experiment using the `class DefaultTsFileInput implements
TsFileInput` to
1) position(), 2) read(ByteBuffer dst, long position),
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