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https://issues.apache.org/jira/browse/HBASE-26552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17502777#comment-17502777
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Hudson commented on HBASE-26552:
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Results for branch branch-2.4
[build #302 on
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> Introduce retry to logroller to avoid abort
> -------------------------------------------
>
> Key: HBASE-26552
> URL: https://issues.apache.org/jira/browse/HBASE-26552
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Affects Versions: 3.0.0-alpha-2, 2.4.10
> Reporter: Xiaolin Ha
> Assignee: Xiaolin Ha
> Priority: Major
> Fix For: 2.5.0, 2.6.0, 3.0.0-alpha-3, 2.4.11
>
>
> When calling RollController#rollWal in AbstractWALRoller, the regionserver
> may abort when encounters exception,
> {code:java}
> ...
> } catch (FailedLogCloseException | ConnectException e) {
> abort("Failed log close in log roller", e);
> } catch (IOException ex) {
> // Abort if we get here. We probably won't recover an IOE. HBASE-1132
> abort("IOE in log roller",
> ex instanceof RemoteException ? ((RemoteException)
> ex).unwrapRemoteException() : ex);
> } catch (Exception ex) {
> LOG.error("Log rolling failed", ex);
> abort("Log rolling failed", ex);
> } {code}
> I think we should support retry of rollWal here to avoid recovering the
> service by killing regionserver. The restart of regionserver is costly and
> very not friendly to the availability.
> I find that when creating new writer for the WAL in
> FanOutOneBlockAsyncDFSOutputHelper#createOutput, it supports retry to
> addBlock by setting this config "hbase.fs.async.create.retries". The idea of
> retry to roll WAL is similar to it, they both try best to make roll WAL
> succeed.
> But the initialization of new WAL writer also includes flushing the write
> buffer flush and waiting until it is completed by
> AsyncProtobufLogWriter#writeMagicAndWALHeader, which can also fail by some
> hardware reasons. The regionserver connected to the datanodes after addBlock,
> but that not means the magic and header can be flushed successfully.
> {code:java}
> protected long writeMagicAndWALHeader(byte[] magic, WALHeader header) throws
> IOException {
> return write(future -> {
> output.write(magic);
> try {
> header.writeDelimitedTo(asyncOutputWrapper);
> } catch (IOException e) {
> // should not happen
> throw new AssertionError(e);
> }
> addListener(output.flush(false), (len, error) -> {
> if (error != null) {
> future.completeExceptionally(error);
> } else {
> future.complete(len);
> }
> });
> });
> }{code}
> We have found that in our production clusters, there exists aborting of
> regionservers that caused by "IOE in log roller". And the practice in our
> clusters is that just one more retry of rollWal can make the WAL roll
> complete and continue serving.
>
>
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