MsgPack instruction to bridge pipe with msgpack

[chenbinhi]

example:

f := flow.New("top5 words in passwd").
Read(file.Txt("/etc/passwd", 1)).
Map("tokenize", mapper.Tokenize). // invoke the registered "tokenize" mapper function.
Pipe("debugWithPipe", "tee debug.txt").MsgPack("fromPipeToMsgpack").
Map("addOne", mapper.AppendOne). // invoke the registered "addOne" mapper function.
ReduceByKey("sum", reducer.SumInt64). // invoke the registered "sum" reducer function.
Sort("sortBySum", flow.OrderBy(2, true)).
Top("top5", 5, flow.OrderBy(2, false)).
Printlnf("%s\t%d")

[codecov-io]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #77   +/-   ##
=======================================
  Coverage   55.37%   55.37%           
=======================================
  Files           9        9           
  Lines         186      186           
=======================================
  Hits          103      103           
  Misses         81       81           
  Partials        2        2

---

Continue to review full report at Codecov.

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[lewgun]

AllShardTOAllShard -> AllShardToAllShard ?

[chrislusf]

This Piper to msgpack should have been transparently done already. It did not work?

[chenbinhi]

testcase:

f := flow.New("top5 words in passwd").
Read(file.Txt("/etc/passwd", 1)).
Map("tokenize", mapper.Tokenize). // invoke the registered "tokenize" mapper function.
Pipe("debugWithPipe", "tee debug.txt").
// MsgPack("fromPipeToMsgack").
Partition("part", 2, flow.Field(1)).
Map("addOne", mapper.AppendOne). // invoke the registered "addOne" mapper function.
ReduceByKey("sum", reducer.SumInt64). // invoke the registered "sum" reducer function.
Sort("sortBySum", flow.OrderBy(2, true)).
Top("top5", 5, flow.OrderBy(2, false)).
Printlnf("%s\t%d")

$ go run word_count_in_go.go
2017/09/22 23:58:21 Failed to run task part.ScatterPartitions-0: Failed to read message: Failed to read message content size 1919251285, but read only 4829: unexpected EOF

[chrislusf]

It's better to avoid one more API. I fixed the issue with this diff.

3162ba8

[forgetso]

Hi, I also get this error when running util.NewRow within genShardInfo in a plugin I'm writing.

if err := util.NewRow(util.Now(), encodedShard).WriteTo(writer); err != nil { return err }

The encoded data is type []uint8 and looks like this:

Encoded shard is type []uint8
[37 255 129 3 1 1 13 71 101 116 104 83 104 97 114 100 73 110 102 111 1 255 130 0 1 1 1 5 72 111 115 116 115 1 12 0 0 0 3 255 130 0]

The following debug shows me:

// ReadMessage reads out the []byte for one message func ReadMessage(reader io.Reader) (m []byte, err error) { fmt.Println(reader)

&{[69 0 0 0 130 166 75 95 95 115 108 99 145 196 42 37 255 129 3 1 1 13 71 101 116 104 83 104 97 114 100 73 110 102 111 1 255 130 0 1 1 1 5 72 111 115 116 115 1 12 0 0 0 3 255 130 0 166 84 95 95 105 54 52 211 0 0 1 95 244 138 232 38 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x459d406]

goroutine 9 [running]:
github.com/bbb/go-bbb/core.GetCanonicalHash(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/Users/forgetso/golang/src/github.com/bbb/go-bbb/core/database_util.go:95 +0x1f6
github.com/bbb/go-bbb/core.(*BlockChain).GetBlockByNumber(0xc4201d4000, 0x0, 0x1)
/Users/forgetso/golang/src/github.com/bbb/go-bbb/core/blockchain.go:565 +0xff
_/Users/forgetso/dev/txfg/plugins/gg.(*GethShardInfo).ReadSplit(0xc4201d4000, 0x2a, 0x2a)
/Users/forgetso/dev/txfg/plugins/gg/geth_shard_info.go:50 +0x5bd
_/Users/forgetso/dev/txfg/plugins/gg.readShard(0xc4201c6010, 0x1, 0x1, 0x0, 0x0)
/Users/forgetso/dev/txfg/plugins/gg/geth_shard_info.go:42 +0xb9
github.com/chrislusf/gleam/gio.(*gleamRunner).doProcessMapper(0xc42000e558, 0x4b10680, 0xc42005ba80, 0x47873e0, 0x0, 0x0)
/Users/forgetso/golang/src/github.com/chrislusf/gleam/gio/mapper.go:32 +0x1b5
github.com/chrislusf/gleam/gio.(*gleamRunner).processMapper.func1(0x0, 0x0)
/Users/forgetso/golang/src/github.com/chrislusf/gleam/gio/mapper.go:14 +0x45
github.com/chrislusf/gleam/gio.(*gleamRunner).report.func1(0xc42017e630, 0xc420015ad0)
/Users/forgetso/golang/src/github.com/chrislusf/gleam/gio/reporter.go:23 +0x27
created by github.com/chrislusf/gleam/gio.(*gleamRunner).report
/Users/forgetso/golang/src/github.com/chrislusf/gleam/gio/reporter.go:22 +0x1aa
Failed to process output: Failed to read message: Failed to read message content size 1953066569, but read only 26: unexpected EOF

2017/11/25 18:57:45 Failed to run task Output-0: Failed to read message: Failed to read message content size 1953066569, but read only 26: unexpected EOF

Please will you let me know what's wrong here?

[forgetso]

The git page stripped out the nil from the last comment:

0xc42000e5d0 73 73 <nil> 38 -1}

[chrislusf]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x459d406]

goroutine 9 [running]:
github.com/bbb/go-bbb/core.GetCanonicalHash(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/Users/forgetso/golang/src/github.com/bbb/go-bbb/core/database_util.go:95 +0x1f6

[forgetso]

@chrislusf Thanks a lot, I'm just starting Go and not very familiar with the error reporting.

[forgetso]

@chrislusf So this error appears to be coming from my shard_info file for my plugin. Is it possible to print debug from the shard_info file? I've surrounded the function with Printlns but nothing is being emitted.

Could you also comment on my understanding of the plugin structure?

plugin_source.go - genShardInfos - determines the split for the shard. For example, an databse iteration over 1000 days with 2 partitions would mean that shard info was created with a db connection and a loop range shard 1 (days=1 to 500) shard 2 (days=501 to 1000)

plugin_shard_info.go - ReadSplit - uses the shard info generated in plugin_source.go to return the data. Is called by Gleam Flow when you invoke a function like printlnf after read.

	f := flow.New("Plugin reader").
		Read(g).Printlnf("%x\n\n")

It would be great to know if this is correct or not.

[chrislusf]

I mostly use println()

Correct.

[forgetso]

For anyone else reading this, I was able to get the subprocesses to print using the Stderr output.

fmt.Fprintf(os.Stderr, "Decode Shard Info...\n")

My shard info was being set to nil as the struct I was gob encoding had vars beginning with lowercase letters (unexported fields).