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Allow to send Spark logs to the Almond kernel console output
Can be useful for debugging
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95 changes: 95 additions & 0 deletions
95
...s/almond-spark/src/main/scala/org/apache/spark/sql/almondinternals/SendLogToConsole.scala
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package org.apache.spark.sql.almondinternals | ||
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import almond.api.JupyterApi | ||
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import java.io.{BufferedReader, File, FileReader, PrintStream} | ||
import java.nio.file.{Files, StandardOpenOption} | ||
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import scala.collection.mutable.ListBuffer | ||
import scala.concurrent.duration.{DurationInt, FiniteDuration} | ||
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final class SendLogToConsole( | ||
f: File, | ||
out: PrintStream, | ||
threadName: String = "send-log-console", | ||
lineBufferSize: Int = 10, | ||
delay: FiniteDuration = 2.seconds | ||
) { | ||
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@volatile private var keepReading = true | ||
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val thread: Thread = | ||
new Thread(threadName) { | ||
override def run(): Unit = { | ||
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var r: FileReader = null | ||
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try { | ||
// https://stackoverflow.com/questions/557844/java-io-implementation-of-unix-linux-tail-f/558262#558262 | ||
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r = new FileReader(f) | ||
val br = new BufferedReader(r) | ||
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var lines = new ListBuffer[String] | ||
while (keepReading) { | ||
val line = br.readLine() | ||
if (line == null) | ||
// wait until there is more in the file | ||
Thread.sleep(delay.toMillis) | ||
else { | ||
lines += line | ||
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while (keepReading && lines.length <= lineBufferSize && br.ready()) | ||
lines += br.readLine() | ||
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val l = lines.result() | ||
lines.clear() | ||
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for (line <- l) | ||
out.println(line) | ||
} | ||
} | ||
} | ||
catch { | ||
case _: InterruptedException => | ||
// normal exit | ||
case e: Throwable => | ||
System.err.println(s"Thread $threadName crashed") | ||
e.printStackTrace(System.err) | ||
} | ||
finally | ||
if (r != null) | ||
r.close() | ||
} | ||
} | ||
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def start(): Unit = { | ||
assert(keepReading, "Already stopped") | ||
if (!thread.isAlive) | ||
synchronized { | ||
if (!thread.isAlive) | ||
thread.start() | ||
} | ||
} | ||
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def stop(): Unit = { | ||
keepReading = false | ||
thread.interrupt() | ||
} | ||
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} | ||
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object SendLogToConsole { | ||
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def start(f: File)(implicit jupyterApi: JupyterApi): SendLogToConsole = { | ||
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// It seems the file must exist for the reader above to get content appended to it. | ||
if (!f.exists()) | ||
Files.write(f.toPath, Array.emptyByteArray, StandardOpenOption.CREATE) | ||
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val sendLog = new SendLogToConsole(f, jupyterApi.consoleErr) | ||
sendLog.start() | ||
sendLog | ||
} | ||
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} |
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