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Posted to issues@hbase.apache.org by "Duo Zhang (JIRA)" <ji...@apache.org> on 2016/02/11 04:59:18 UTC
[jira] [Updated] (HBASE-15252) Data loss when replaying wal if HDFS
timeout
[ https://issues.apache.org/jira/browse/HBASE-15252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Duo Zhang updated HBASE-15252:
------------------------------
Description:
This is a problem introduced by HBASE-13825 where we change the exception type in catch block in {{readNext}} method of {{ProtobufLogReader}}.
{code:title=ProtobufLogReader.java}
try {
......
ProtobufUtil.mergeFrom(builder, new LimitInputStream(this.inputStream, size),
(int)size);
} catch (IOException ipbe) { // <------ used to be InvalidProtocolBufferException
throw (EOFException) new EOFException("Invalid PB, EOF? Ignoring; originalPosition=" +
originalPosition + ", currentPosition=" + this.inputStream.getPos() +
", messageSize=" + size + ", currentAvailable=" + available).initCause(ipbe);
}
{code}
Here if the {{inputStream}} throws an {{IOException}} due to timeout or something, we just convert it to an {{EOFException}} and at the bottom of this method, we ignore {{EOFException}} and return false. This cause the upper layer think we reach the end of file. So when replaying we will treat the HDFS timeout error as a normal end of file and cause data loss.
> Data loss when replaying wal if HDFS timeout
> --------------------------------------------
>
> Key: HBASE-15252
> URL: https://issues.apache.org/jira/browse/HBASE-15252
> Project: HBase
> Issue Type: Bug
> Components: wal
> Reporter: Duo Zhang
> Assignee: Duo Zhang
>
> This is a problem introduced by HBASE-13825 where we change the exception type in catch block in {{readNext}} method of {{ProtobufLogReader}}.
> {code:title=ProtobufLogReader.java}
> try {
> ......
> ProtobufUtil.mergeFrom(builder, new LimitInputStream(this.inputStream, size),
> (int)size);
> } catch (IOException ipbe) { // <------ used to be InvalidProtocolBufferException
> throw (EOFException) new EOFException("Invalid PB, EOF? Ignoring; originalPosition=" +
> originalPosition + ", currentPosition=" + this.inputStream.getPos() +
> ", messageSize=" + size + ", currentAvailable=" + available).initCause(ipbe);
> }
> {code}
> Here if the {{inputStream}} throws an {{IOException}} due to timeout or something, we just convert it to an {{EOFException}} and at the bottom of this method, we ignore {{EOFException}} and return false. This cause the upper layer think we reach the end of file. So when replaying we will treat the HDFS timeout error as a normal end of file and cause data loss.
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