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https://issues.apache.org/jira/browse/HBASE-1556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753975#action_12753975
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Andrew Purtell commented on HBASE-1556:
---------------------------------------
HBASE-1828 is an issue where store level unit tests for filters pass but client
side tests lock up. This is an indication that we need more client side tests
for major functions. A persistent minicluster both helps and hurts here. It may
make the suite fast enough to run the tests in a reasonable time frame, but bad
state from a previous test case may manifest in a later one, causing confusion.
> [testing] optimize minicluster based testing in the test suite
> --------------------------------------------------------------
>
> Key: HBASE-1556
> URL: https://issues.apache.org/jira/browse/HBASE-1556
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: test
> Reporter: Andrew Purtell
> Priority: Critical
> Fix For: 0.21.0
>
>
> It is possible to tell junit to run all of the unit tests in a single forked
> JVM:
> \\
> {code}
> <junit fork="yes" forkmode="once" ... >
> ...
> </junit>
> {code}
> Then, use statics to manage miniclusters in background threads:
> {code}
> protected static HBaseConfiguration conf = new HBaseConfiguration();
> protected static MiniZooKeeperCluster zooKeeperCluster;
> protected static MiniHBaseCluster hbaseCluster;
> protected static MiniDFSCluster dfsCluster;
> public static boolean isMiniClusterRunning() {
> return hbaseCluster != null;
> }
> private static void startDFS() throws Exception {
> if (dfsCluster != null) {
> LOG.error("MiniDFSCluster already running");
> return;
> }
> Path path = new Path(
> conf.get("test.build.data", "test/build/data"),
> "MiniClusterTestCase");
> FileSystem testFS = FileSystem.get(conf);
> if (testFS.exists(path)) {
> testFS.delete(path, true);
> }
> testDir = new File(path.toString());
> dfsCluster = new MiniDFSCluster(conf, 2, true, (String[])null);
> FileSystem filesystem = dfsCluster.getFileSystem();
> conf.set("fs.default.name", filesystem.getUri().toString());
> Path parentdir = filesystem.getHomeDirectory();
> conf.set(HConstants.HBASE_DIR, parentdir.toString());
> filesystem.mkdirs(parentdir);
> FSUtils.setVersion(filesystem, parentdir);
> LOG.info("started MiniDFSCluster in " + testDir.toString());
> }
> private static void stopDFS() {
> if (dfsCluster != null) try {
> dfsCluster.shutdown();
> dfsCluster = null;
> } catch (Exception e) {
> LOG.warn(StringUtils.stringifyException(e));
> }
> }
> private static void startZooKeeper() throws Exception {
> if (zooKeeperCluster != null) {
> LOG.error("ZooKeeper already running");
> return;
> }
> zooKeeperCluster = new MiniZooKeeperCluster();
> zooKeeperCluster.startup(testDir);
> LOG.info("started " + zooKeeperCluster.getClass().getName());
> }
> private static void stopZooKeeper() {
> if (zooKeeperCluster != null) try {
> zooKeeperCluster.shutdown();
> zooKeeperCluster = null;
> } catch (Exception e) {
> LOG.warn(StringUtils.stringifyException(e));
> }
> }
>
> private static void startHBase() throws Exception {
> if (hbaseCluster != null) {
> LOG.error("MiniHBaseCluster already running");
> return;
> }
> hbaseCluster = new MiniHBaseCluster(conf, 1);
> // opening the META table ensures that cluster is running
> new HTable(conf, HConstants.META_TABLE_NAME);
> LOG.info("started MiniHBaseCluster");
> }
>
> private static void stopHBase() {
> if (hbaseCluster != null) try {
> HConnectionManager.deleteConnectionInfo(conf, true);
> hbaseCluster.shutdown();
> hbaseCluster = null;
> } catch (Exception e) {
> LOG.warn(StringUtils.stringifyException(e));
> }
> }
> public static void startMiniCluster() throws Exception {
> try {
> startDFS();
> startZooKeeper();
> startHBase();
> } catch (Exception e) {
> stopHBase();
> stopZooKeeper();
> stopDFS();
> throw e;
> }
> }
> public static void stopMiniCluster() {
> stopHBase();
> stopZooKeeper();
> stopDFS();
> }
> {code}
> The base class for cluster testing can do something like so in its startUp
> method:
> {code}
> protected void setUp() throws Exception {
> // start the mini cluster if it is not running yet
> if (!isMiniClusterRunning()) {
> startMiniCluster();
> }
> }
> {code}
> For example, when testing Stargate, it is clear that the minicluster startup
> costs are included in the run time of the first unit test, which checks if
> the miniclusters are all running, and subsequent tests do not incur those
> costs:
> {noformat}
> test:
> [delete] Deleting directory /home/apurtell/src/stargate.git/build/test/logs
> [mkdir] Created dir: /home/apurtell/src/stargate.git/build/test/logs
> [junit] Running org.apache.hadoop.hbase.stargate.Test00MiniCluster
> [junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 10.329 sec
> [junit] Running org.apache.hadoop.hbase.stargate.Test01VersionResource
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 1.243 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestCellModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.012 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestCellSetModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.018 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestRowModel
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.008 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestScannerModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.013 sec
> [junit] Running
> org.apache.hadoop.hbase.stargate.model.TestStorageClusterStatusModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.024 sec
> [junit] Running
> org.apache.hadoop.hbase.stargate.model.TestStorageClusterVersionModel
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.006 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestTableInfoModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.017 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestTableListModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.012 sec
> [junit] Running
> org.apache.hadoop.hbase.stargate.model.TestTableRegionModel
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.018 sec
> [junit] Running org.apache.hadoop.hbase.stargate.model.TestVersionModel
> [junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.014 sec
> BUILD SUCCESSFUL
> Total time: 14 seconds
> {noformat}
> This can obviously shave a lot of time off the current HBase test suite.
> However, the current suite will need to be heavily modified. Each test case
> has been written with the expectation that it starts up a pristine
> minicluster, so there are assumptions made that will be invalidated, and many
> cases which duplicate the table creates of others, etc.
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