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From "Chenghao Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8192) wrong logic in HRegion.bulkLoadHFiles(List)
Date Sat, 30 Mar 2013 17:15:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-8192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chenghao Jiang updated HBASE-8192:
----------------------------------

    Attachment: 8192-v2-with-a-test-case.txt

There are some problems while running test "TestLoadIncrementalHFiles" in my environment.

Just have a try with a new patch that has one more test.
                
> wrong logic in HRegion.bulkLoadHFiles(List)
> -------------------------------------------
>
>                 Key: HBASE-8192
>                 URL: https://issues.apache.org/jira/browse/HBASE-8192
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.94.1, 0.94.2, 0.94.3, 0.94.4, 0.94.5
>            Reporter: Chenghao Jiang
>              Labels: patch
>             Fix For: 0.94.7
>
>         Attachments: 8192.txt, 8192-v2-with-a-test-case.txt
>
>
> the wrong logic is here:
>   when a ColumnFamily does not exist, it gets a null store object, then ioes.add(ioe);
failures.add(p)
>   but the code below, if (failures.size() != 0), it prints a warn log and return false,
so it will never go into the code if (ioes.size() != 0) below, and IOException will not be
thrown, then the client will keep retry forever.
>   there is the same situation when doing store.assertBulkLoadHFileOk, if any WrongRegionException
is caught and failures.add(p), then all the other IOException thrown by assertBulkLoadHFileOk
will be ignored.
>   so i think if (failures.size() != 0) {} should be dealt with after if (ioes.size()
!=0) {}
> {code}
> for (Pair<byte[], String> p : familyPaths) {
>     byte[] familyName = p.getFirst();
>     String path = p.getSecond();
>     Store store = getStore(familyName);
>     if (store == null) {
>         IOException ioe = new DoNotRetryIOException(
>                 "No such column family " + Bytes.toStringBinary(familyName));
>         ioes.add(ioe);
>         failures.add(p);
>     } else {
>         try {
>             store.assertBulkLoadHFileOk(new Path(path));
>         } catch (WrongRegionException wre) {
>             // recoverable (file doesn't fit in region)
>             failures.add(p);
>         } catch (IOException ioe) {
>             // unrecoverable (hdfs problem)
>             ioes.add(ioe);
>         }
>     }
> }
> // validation failed, bail out before doing anything permanent.
> if (failures.size() != 0) {
>     StringBuilder list = new StringBuilder();
>     for (Pair<byte[], String> p : failures) {
>         list.append("\n").append(Bytes.toString(p.getFirst())).append(" : ")
>             .append(p.getSecond());
>     }
>     // problem when validating
>     LOG.warn("There was a recoverable bulk load failure likely due to a" +
>             " split.  These (family, HFile) pairs were not loaded: " + list);
>     return false;
> }
> // validation failed because of some sort of IO problem.
> if (ioes.size() != 0) {
>     LOG.error("There were IO errors when checking if bulk load is ok.  " +
>             "throwing exception!");
>     throw MultipleIOException.createIOException(ioes);
> }
> {code}

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