Avoid the pattern where a Random object is allocated, used once or twice, and
then left for GC. This pattern triggers warnings from some static analysis tools
because this pattern leads to poor effective randomness. In a few cases we were
legitimately suffering from this issue; in others a change is still good to
reduce noise in analysis results.
Use ThreadLocalRandom where there is no requirement to set the seed to gain
good reuse.
Where useful relax use of SecureRandom to simply Random or ThreadLocalRandom,
which are unlikely to block if the system entropy pool is low, if we don't need
crypographically strong randomness for the use case. The exception to this is
normalization of use of Bytes#random to fill byte arrays with randomness.
Because Bytes#random may be used to generate key material it must be backed by
SecureRandom.
Signed-off-by: Duo Zhang <zhangduo@apache.org>
`CallDroppedException` can be thrown with `CallRunner.drop()` by queue implementations that decide to drop calls to groom the RPC call backlog. The LifoCoDel queue does this I believe and with Pluggable queue it's possible for 3rd party queue implementations to be using `drop()` for similar reasons. It would be nice for the server to be tracking these exceptions in metrics since otherwise you might have to do some extra lifting on the client side.
Signed-off-by: Duo Zhang <zhangduo@apache.org>
Reviewed-by: Bryan Beaudreault <bbeaudreault@hubspot.com>
Introduces a new metric that tracks number of replication sources that are stuck in initialization.
Signed-off-by: Xu Cang <xucang@apache.org>
Signed-off-by: Bharath Vissapragada <bharathv@apache.org>
Add new metric rpcFullScanRequestCount to track number of requests that are full region scans. Can be used to notify user to check if this is truly intended.
Signed-off-by Anoop Sam John <anoopsamjohn@apache.org>
Signed-off-by Ramkrishna S Vasudevan <ramkrishna@apache.org>
* Admin API getLogEntries() for ring buffer use-cases: so far, provides balancerDecision and slowLogResponse
* Refactor RPC call for similar use-cases
* Single RPC API getLogEntries() for both Master.proto and Admin.proto
Closes#2261
Signed-off-by: Andrew Purtell <apurtell@apache.org>
* HBASE-24205 Create metric to know the number of reads that happens from memstore
* Fix checkstyles and whitespaces
* Checkstyl, whitespace and javadoc
* Fixed review comments
* Fix unused imports
* Rebase with latest commit
* Adding the table vs store metric by consolidating
* Combine get and scan metrics and make all relevant changes
* Track for full row and then increment either memstore or file read
metric
* TestMetricsStore test fix
* Only increment the memstore metric if all cells are from memstore, if
not treat as mixed reads
* Remove metricsstore and aggregate at region level
* Addresses review comments-metric name updated everywhere
* Metric name change
* Review comment changes
Co-authored-by: Ramkrishna <ramkrishna@apache.org>
Signed-off by:Anoop Sam John<anoopsamjohn@gmail.com>
Signed-off by:Viraj Jasani<virajjasani@apache.org>
JMXCacheBuster resets the metrics state at various points in time. These
events can potentially race with a master shutdown. When the master is
tearing down, metrics initialization can touch a lot of unsafe state,
for example invalidated FS objects. To avoid this, this patch makes
the getMetrics() a no-op when the master is either stopped or in the
process of shutting down. Additionally, getClusterId() when the server
is shutting down is made a no-op.
Simulating a test for this is a bit tricky but with the patch I don't
locally see the long stacktraces from the jira.
Signed-off-by: Michael Stack <stack@apache.org>
Duo Zhang
litao
liangxs
Bri Augenreich
Xiaolin Ha
Andrew Purtell
Bryan Beaudreault
Rushabh Shah
Richard Marscher
Almog Tavor
xijiawen
Baiqiang Zhao
Sandeep Pal
meiyi
Rahul Kumar
gkanade
Reid Chan
ramkrish86
Bharath Vissapragada
Viraj Jasani
Javier Akira Luca de Tena
Josh Elser
Toshihiro Suzuki
WenFeiYi
Wellington Ramos Chevreuil
Jan Hentschel
Wei-Chiu Chuang