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https://issues.apache.org/jira/browse/DRILL-4726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524282#comment-15524282
]
ASF GitHub Bot commented on DRILL-4726:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r80548740
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/FunctionImplementationRegistry.java
---
@@ -301,29 +323,120 @@ private ScanResult scan(ClassLoader classLoader,
Path path, URL[] urls) throws I
return RunTimeScan.dynamicPackageScan(drillConfig,
Sets.newHashSet(urls));
}
}
- throw new FunctionValidationException(String.format("Marker file %s is
missing in %s.",
+ throw new JarValidationException(String.format("Marker file %s is
missing in %s",
CommonConstants.DRILL_JAR_MARKER_FILE_RESOURCE_PATHNAME,
path.getName()));
}
- private static String getUdfDir() {
- return Preconditions.checkNotNull(System.getenv("DRILL_UDF_DIR"),
"DRILL_UDF_DIR variable is not set");
+ /**
+ * Return list of jars that are missing in local function registry
+ * but present in remote function registry.
+ *
+ * @param remoteFunctionRegistry remote function registry
+ * @param localFunctionRegistry local function registry
+ * @return list of missing jars
+ */
+ private List<String> getMissingJars(RemoteFunctionRegistry
remoteFunctionRegistry,
+ LocalFunctionRegistry
localFunctionRegistry) {
+ List<Jar> remoteJars =
remoteFunctionRegistry.getRegistry().getJarList();
+ List<String> localJars = localFunctionRegistry.getAllJarNames();
+ List<String> missingJars = Lists.newArrayList();
+ for (Jar jar : remoteJars) {
+ if (!localJars.contains(jar.getName())) {
+ missingJars.add(jar.getName());
+ }
+ }
+ return missingJars;
+ }
+
+ /**
+ * Creates local udf directory, if it doesn't exist.
+ * Checks if local is a directory and if current application has write
rights on it.
+ * Attempts to clean up local idf directory in case jars were left after
previous drillbit run.
+ *
+ * @return path to local udf directory
+ */
+ private Path getLocalUdfDir() {
+ String confDir = getConfDir();
+ File udfDir = new File(confDir, "udf");
+ String udfPath = udfDir.getPath();
+ udfDir.mkdirs();
+ Preconditions.checkState(udfDir.exists(), "Local udf directory [%s]
must exist", udfPath);
+ Preconditions.checkState(udfDir.isDirectory(), "Local udf directory
[%s] must be a directory", udfPath);
+ Preconditions.checkState(udfDir.canWrite(), "Local udf directory [%s]
must be writable for application user", udfPath);
+ try {
+ FileUtils.cleanDirectory(udfDir);
+ } catch (IOException e) {
+ throw new DrillRuntimeException("Error during local udf directory
clean up", e);
+ }
+ return new Path(udfDir.toURI());
+ }
+
+ /**
+ * First tries to get drill conf directory value from system properties,
+ * if value is missing, checks environment properties.
+ * Throws exception is value is null.
+ * @return drill conf dir path
+ */
+ private String getConfDir() {
+ String drillConfDir = "DRILL_CONF_DIR";
+ String value = System.getProperty(drillConfDir);
+ if (value == null) {
+ value = Preconditions.checkNotNull(System.getenv(drillConfDir), "%s
variable is not set", drillConfDir);
+ }
+ return value;
+ }
+
+ /**
+ * Copies jar from remote udf area to local udf area with numeric suffix,
+ * in order to achieve uniqueness for each locally copied jar.
+ * Ex: DrillUDF-1.0.jar -> DrillUDF-1.0_12200255588.jar
+ *
+ * @param jarName jar name to be copied
+ * @param remoteFunctionRegistry remote function registry
+ * @return local path to jar that was copied
+ * @throws IOException in case of problems during jar coping process
+ */
+ private Path copyJarToLocal(String jarName, RemoteFunctionRegistry
remoteFunctionRegistry) throws IOException {
+ String generatedName = String.format(generated_jar_name_pattern,
+ Files.getNameWithoutExtension(jarName), System.nanoTime(),
Files.getFileExtension(jarName));
+ Path registryArea = remoteFunctionRegistry.getRegistryArea();
+ FileSystem fs = remoteFunctionRegistry.getFs();
+ Path remoteJar = new Path(registryArea, jarName);
+ Path localJar = new Path(localUdfDir, generatedName);
+ try {
+ fs.copyToLocalFile(remoteJar, localJar);
+ } catch (IOException e) {
+ String message = String.format("Error during jar [%s] coping from
[%s] to [%s]",
+ jarName, registryArea.toUri().getPath(),
localUdfDir.toUri().getPath());
+ throw new IOException(message, e);
+ }
+ return localJar;
}
/**
* Fires when jar name is submitted for unregistration.
* Will unregister all functions associated with the jar name
- * and delete binary and source associated with the jar from local
DRILL_UDF_DIR.
+ * and delete binary and source associated with the jar from local udf
directory
+ * according to pattern jar name + {@link #jar_suffix_pattern}.
--- End diff --
Please explain the logic for the following case.
* Query Q1 is executing using UDF U1.
* As Q1 executes, some other user issues a DROP for UDF U1.
How can Q1 continue to execute? Does the code for Q1 maintain a pointer to
the class (and hence class loader) for U1, keeping it available?
Recall that a goal is to ensure that a query will continue to execute even
if its UDF gets deleted out from under it.
> Dynamic UDFs support
> --------------------
>
> Key: DRILL-4726
> URL: https://issues.apache.org/jira/browse/DRILL-4726
> Project: Apache Drill
> Issue Type: New Feature
> Affects Versions: 1.6.0
> Reporter: Arina Ielchiieva
> Assignee: Arina Ielchiieva
> Fix For: Future
>
>
> Allow register UDFs without restart of Drillbits.
> Design is described in document below:
> https://docs.google.com/document/d/1FfyJtWae5TLuyheHCfldYUpCdeIezR2RlNsrOTYyAB4/edit?usp=sharing
>
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