[HBASE-8031] Adopt goraci as an Integration test

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.98.0, 0.94.6, 0.95.0
• Component/s: test
• Hadoop Flags: Reviewed

Release Note

Added a system test called IntegrationTestBigLinkedList. This test runs many ingest clients that continually create linked lists containing 25 million nodes. At some point the clients are stopped and a map reduce job is run to ensure no linked list has a hole. A hole indicates data was lost.

• Assignee: Enis Soztutar
• Reporter: Enis Soztutar
• Created: 07/Mar/13 19:41
• Updated: 09/Apr/13 15:52
• Resolved: 14/Mar/13 00:02

Description

As you might know, I am a big fan of the goraci test that Keith Turner has developed, which in turn is inspired by the Accumulo test called Continuous Ingest.

As much as I hate to say it, having to rely on gora and and external github library makes using this lib cumbersome. And lately we had to use this for testing against secure clusters and with Hadoop2, which gora does not support for now.

So, I am proposing we add this test as an IT in the HBase code base so that all HBase devs can benefit from it.

The original source code can be found here:

• https://github.com/keith-turner/goraci
• https://github.com/enis/goraci/

From the javadoc:

Apache Accumulo [0] has a simple test suite that verifies that data is not
 * lost at scale. This test suite is called continuous ingest. This test runs
 * many ingest clients that continually create linked lists containing 25
 * million nodes. At some point the clients are stopped and a map reduce job is
 * run to ensure no linked list has a hole. A hole indicates data was lost.··
 *
 * The nodes in the linked list are random. This causes each linked list to
 * spread across the table. Therefore if one part of a table loses data, then it
 * will be detected by references in another part of the table.
 *
Below is rough sketch of how data is written. For specific details look at
 * the Generator code.
 *
 * 1 Write out 1 million nodes· 2 Flush the client· 3 Write out 1 million that
 * reference previous million· 4 If this is the 25th set of 1 million nodes,
 * then update 1st set of million to point to last· 5 goto 1
 *
 * The key is that nodes only reference flushed nodes. Therefore a node should
 * never reference a missing node, even if the ingest client is killed at any
 * point in time.
 *
 * Some ASCII art time:
     * [ . . . ] represents one batch of random longs of length WIDTH
     *
     *                _________________________
     *               |                  ______ |
     *               |                 |      ||
     *             __+_________________+_____ ||
     *             v v                 v     |||
     * first   = [ . . . . . . . . . . . ]   |||
     *             ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^     |||
     *             | | | | | | | | | | |     |||
     * prev    = [ . . . . . . . . . . . ]   |||
     *             ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^     |||
     *             | | | | | | | | | | |     |||
     * current = [ . . . . . . . . . . . ]   |||
     *                                       |||
     * ...                                   |||
     *                                       |||
     * last    = [ . . . . . . . . . . . ]   |||
     *             | | | | | | | | | | |-----|||
     *             |                 |--------||
     *             |___________________________|

Issue Links

• relates to: HBASE-8091 Goraci test might rewrite data in case of map task failures, which eclipses data loss problems