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  1. HBase
  2. HBASE-10370

Compaction in out-of-date Store causes region split failure


    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 0.94.3, 0.98.0, 0.99.0
    • Fix Version/s: 0.98.0, 0.96.2, 0.99.0
    • Component/s: Compaction
    • Labels:
    • Hadoop Flags:


      In out product cluster, we encounter a problem that two daughter regions can not been opened for FileNotFoundException.

      2014-01-14,20:12:46,927 INFO org.apache.hadoop.hbase.regionserver.SplitRequest: Running rollback/cleanup of failed split of user_profile,xxxxxxxxx,1389671863815.99e016485b0bc142d67ae07a884f6966.; Failed lg-hadoop-st34.bj,21600,1389060755669-daughterOpener=ec8bbda0f132c481b451fa40e7152b98
      java.io.IOException: Failed lg-hadoop-st34.bj,21600,1389060755669-daughterOpener=ec8bbda0f132c481b451fa40e7152b98
      at org.apache.hadoop.hbase.regionserver.SplitTransaction.openDaughters(SplitTransaction.java:375)
      at org.apache.hadoop.hbase.regionserver.SplitTransaction.execute(SplitTransaction.java:467)
      at org.apache.hadoop.hbase.regionserver.SplitRequest.run(SplitRequest.java:69)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:662)
      Caused by: java.io.IOException: java.io.IOException: java.io.FileNotFoundException: File does not exist: /hbase/lgprc-xiaomi/user_profile/99e016485b0bc142d67ae07a884f6966/A/5e05d706e4a84f34acc2cf00f089a4cf

      The reason is that a compaction in an out-of-date Store deletes the hfiles, which are referenced by the daughter regions after split. This will cause the daughter regions can not be opened forever.

      The timeline is that

      Assumption: there are two hfiles: a, b in Store A in Region R
      t0: A compaction request of Store A(a+b) in Region R is sent.

      t1: First Split for Region R. But this split is timeout and rollbacked. In the rollback, region reinitializes all store objects , see SplitTransaction #824. Now the store is Region R is A'(a+b).

      t2: Run the compaction sent in t0 . (hfile: a + b -> c): A(a+b) -> A(c). Hfile a and b are archived.

      t3: Another Split for Region R. R splits into two region R.0, R.1, which create hfile references for hfile a, b from Store A'(a + b)

      t4: For hfile a, b have been deleted, the opening for region R.0 and R.1 will failed for FileNotFoundException.

      I have add a test to identity this problem.

      After search the jira, maybe HBASE-8502 is the same problem. Dimitri Goldin


        1. 10370-v4.patch
          1.0 kB
          Ted Yu
        2. 10370v2.096.txt
          1.0 kB
        3. 10370-v3.patch
          4 kB
          Ted Yu
        4. HBASE-10370-v2.diff
          4 kB
          Liu Shaohui
        5. HBASE-10370-v1.diff
          4 kB
          Liu Shaohui

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              • Assignee:
                liushaohui Liu Shaohui
                liushaohui Liu Shaohui
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